Frequently Asked Questions

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Are FloPlast white cladding products suitable for use in swimming pools?

Yes, contact with water from swimming pools is not detrimental to PVC.

Are woodgrain laminated products guaranteed for external use?

Yes, they are guaranteed for 10 years.

Can Hollow Soffit be used as cladding?

Hollow soffit cannot be used as cladding (externally) as it is not water tight however it can be used internally.

Can laminate boards be installed underwater and will this affect the guarantee?

Yes, you can install cellular products in water and the foiling will not peel off.
However it must not be used if there is chemicals in the water e.g swimming pools.
There will not be a guarantee against discolouration as it could affect the products colour match if installed part below and part under the water line.

Can lights be fitted into Hollow Soffit if installed internally?

Yes, lights can be fitted as long as they are mains fed and not through a transformer.

Can you paint FloPlast cellular products?

If you do need to paint the product then the system should be cleaned using a degreasing agent such as sugar soap.
Once cleaned two coats of a good quality gloss (Solvent Based) paint should be applied.
Avoid scouring or roughing the surface of the plastic as this will affect the final appearance of the painted product.

Has hollow soffit got a Class 1 Fire Rating?

Yes, hollow soffit was tested by the BBA to BS476-7 and delivered a rating of Class IY.

How do I connect Corners, Joints and Trims to fascia and soffit?

FloPlast recommend that the use of Low Modulus Neutral Cure(LMN) Silicone or a proprietary adhesive such as super glue to fix corners, joints and trims. Watch this video to find out more:

How do I connect fascia board together at an apex?

The fascia is connected together with an inline joint or a finial.

Watch this video to find out more:

How do I stop the lower section of Sarking felt from rotting?

FloPlast supply an Eaves Protection System, please refer to our section on Ventilation and Eaves Protection.

How do you fit a laminated board to a 135* Angle?

FloPlast do not offer a laminated 135* Angle so you will need to cut the board to a 22.5* angle on both boards that join together and use a coloured sealant to join then together.

How many types of fascia board do FloPlast supply?

FloPlast Supply seven different types of fascia boards available in a variety of sizes and colours. The different types of Fascia Boards are:

Universal (9mm thick, capping/refurbishment board)
Square Edge Universal (9mm thick, capping/refurbishment board)
Ogee Fascia (10mm capping/refurbishment board)
Mammoth  (18mm full replacement board)
Ogee Mammoth (18mm full replacement board)

How much air flow do I need to allow into the roof space?

If the roof space is not occupied then you need to allow 10mm of airflow.
If the roof space is occupied or the pitch is less than 15° then you need to allow 25mm of airflow.

Is the cellular range compatible with other manufactures products?

No, they are not compatible with any other makes of cellular ranges.

The Building Regulations require ventilation of the roof area in certain circumstances, what products are available to comply with these regulations?

FloPlast produce a range of ventilation products, please refer to our section on ventilation products.

What air gap is required when installing cladding?

We recommend an air gap of 25mm, however NHBC requirements are for a 38mm air gap.

What are the different fascia boards used for?

The 9mm/10mm Capping boards are used as a cover board to go over existing timber backing which must be in good condition.
The 16mm/18mm full replacement boards are used for fully replacing any old fascia or on a new build and can fix straight onto the rafters.

What colours do FloPlast offer and what are the RAL codes

Floplast supply the following colours:

White Signal White RAL 9003
Rosewood Red Brown RAL8012
Golden Oak Ocher Brown RAL 8001
Black Ash Black Brown RAL 8022
Anthracite Anthracite Grey RAL 7016

What distance should the disc soffit ventilators be installed at?

The disc soffit ventilators should be installed at every 250mm to comply with the ventilation requirements of a 10mm air gap.

What expansion gaps are required when installing FloPlast products?

When installing white coloured products an expansion gap of 5mm per 5 metre length is required (i.e. when butting two boards, a 10mm gap should be left). Woodgrain products have a greater linear expansion and a gap of 5mm to 8mm per 5 metre length is required.

What guarantee is offered on the cellular range?

The guarantee is 20 years against discolouration & manufacturing faults against all white products in the range and 10 years for the foiled ranges.
All cases are subject to correct installation and inspection by FloPlast

What is the fire resistance for the cellular products?

Certificate Number 3771 – when tested in accordance with BS 476-7 the multi-purpose board achieved a Class 2Y surface spread of flame rating; all other boards are expected to be similar, except the hollow soffit which achieved a Class 1Y rating.

Certificate Number 3772 – the system achieved a reaction to fire classification of D – s3, d2/(AHM) to BS EN 13501- 1

What is the pitch of a roof?

The pitch is the angle between the soffit board and the rafters.

What is the recommended spacing for pins and nails?

Pins and nails need to be installed every 600mm to the rafters. Two pins are required for soffit that is 200mm or wider.
Anything less that 200mm does not require pins.  For fascia board it is always two pins, every 600mm

What Pins & Nails should be used to fix FloPlast Boards & Trims?

9mm/10mm fascia board – 50mm Nails
16mm/18mm fascia board – 65mm Nails
10mm soffit board – 40mm Pins
10mm hollow soffit board – 30mm Clad Pins

What size is cladding available in?

FloPlast cladding is available in two sizes and profiles. 150mm Shiplap, and 100mm V Joint.

What soffit boards do FloPlast supply?

FloPlast supply three different soffit boards:
10mm thick multi-purpose board
10mm thick Hollow Soffit
10mm thick vented & double vented board

Are FloPlast products compatible with other manufactures gutter systems?

Please visit our website and see the compatibility chart. Some ranges are compatible with other manufactures and some are not.

Can FloPlast gutter systems be painted?

If the gutter needs to be painted, the system should be cleaned, with a degreasing agent such as sugar soap. Once cleaned 2 coats of a good quality gloss paint should be applied. Avoid scouring or roughing the surface of the plastic as this will affect the final appearance of the painted product.

Can FloPlast Gutters be cleaned?

FloPlast’s gutters are produced from PVC-u and are considered low or relatively maintenance free. It may be necessary from time to time to clean our lighter gutter systems. We recommend that a soapy warm water solution is used when cleaning – in severe cases a non-abrasive kitchen cream cleaner can be used.

Can you use solvent cement on FloPlast gutter systems?

Solvent cement is not necessary to use with any gutter or downpipe on normal installations. However it can be used if required on extended offsets.

Do FloPlast offer a guarantee on the rainwater systems?

FloPlast offer a 10 year performance guarantee on all ranges on the condition that the installation is correct as per FloPlast guidelines and is subject to a site visit. A 10 year guarantee against discolouration is offered for Black, Brown, White, Grey and Anthracite Grey with a 20 year guarantee for the Cast Iron effect.

Do I need to allow for expansion on Offsets?

It is not necessary to make any allowance for expansion between offset bends.

Do I need to fit my gutter with a gradient?

FloPlast’s domestic eaves gutters, especially when fixed with a rafter bracket, should be fitted at a gradient no greater than 1:350 fall. The gradient should not be too steep, as this will cause an excessive gap between the lowest edge of the roof and the top of the gutter. Gutters fitted with a fall will have a higher drainage capacity, please refer to our flow rate calculator.

How can “Cast Iron” Style gutters be connected to traditional cast iron?

FloPlast have an extensive range of adaptors. Use the 2 piece adaptor RD5.

How can I prevent leaves blocking my gutters?

FloPlast manufactures FloGuard, which prevents both debris and leaves collecting on the inside of the gutters – balloons are also available, for added protection in the outlets.

How do I connect to a neighbour’s different gutter?

FloPlast have a range of adaptors for most applications, please refer to our section on rainwater adaptors and download our compatibility table.

How do I fit my downpipe into Underground Drainage?

Please refer to our section on downpipe adaptors.

How do I install gutter with out any fascia boards to fix the fascia brackets to?

FloPlast supply a universal rise a fall bracket which comes complete with a spike to set into the mortar between brick work. This fittings then allows you to fix a fascia bracket to that.
Alternatively, FloPlast also supply rafter brackets which fix straight onto the side or top of a rafter and again allows you to fix a fascia bracket to them.

How do I work out what Flow rate is required?

A flow rate calculator is available on our website here – alternatively please contact 01795 431731 to speak to our technical department.

How do you make a swan neck downpipe connection?

You need to connect two 112.5* offset bends together to make a swan neck bend.

How do you stop a union bracket from leaking?

At the first instance the union bracket would need to be inspected. One of the issues could be incorrect installation, this could result in the gutter pulling out of the union bracket.
Also, if the gutter is not installed up to the correct marking on the fitting to allow for expansion & contraction again the gutter can pull out of the fitting.

How much of FloPlast gutter is made from recycled plastics?

A maximum of 20% is recycled plastics as per British Standards. FloPlast gutter is fully recyclable after use.

How much room do I need to leave for the expansion of gutter?

Tests have shown that expansion and contraction of gutter occurs during normal usage, and expansion tolerances are allowed for within our fittings.
Tests were conducted between -8ºC and +40ºC where an expansion of 14.63mm was experienced over a 4 metre  length.
These are obvious extremes, and under normal daily temperature fluctuations expansion and contraction will be in the region of 10mm per 4 metre length.

What are the dimensions of the Drainguard?

Height at front – 30mm
Height at rear – 107mm
Depth – 300mm
Width – 310mm
Width including screw fixing – 335mm
Screwhole centreline – 315mm
Cut out area – 100mm X 145mm

What are the dimensions of the FloPlast rainwater hoppers?

Width – 280mm
Depth from wall including fixing lugs – 170mm
Depth of actual hopper – 185mm
Height at front – 170mm
Height at back – 180mm

Width of actual hopper – 300mm
Width including fixing lugs – 325mm
Depth – 215mm
Height – 255mm

Width of actual hopper – 300mm
Width including fixing lugs – 365mm
Depth – 150mm
Height – 230mm

What are the fixing instructions for the FC50 (Cast Iron Effect Fixings)?

The FC50 is a 12 gauge X 50mm stainless steel screw, with a 12mm, 12 point star head that requires a socket to tighten it. When using these fixings to install the RH4 & RH5 Hoppers, we advise that a 25mm rubber washer is used.
This is because the pre-made screw hole in the hopper is quite large and there is a chance that the screw head could twist and go through the hole.

What are the maximum centres for Gutter Fascia Brackets?

In general, Gutter Fascia Brackets should be a maximum of 1m apart. However, different profiles and downpipe configurations present other design considerations. Please see our Rainwater installation video for more information:

What are the stand off measurements from the wall to the back of the downpipe when using different downpipe clips?

65mm Square downpipe:
RCS1 – 32mm
RCS2 – 4mm
RCS3 – 32mm
68mm Round downpipe:
RC1 – 29mm
RC3 – 30mm
RC4 – 13mm
50mm Round downpipe:
RCM1 – 20mm
80mm Round downpipe:
RCH3 – 23mm

What capacity of water do your gutters hold?

Please refer to our section on Flow Rates for more information.

What colours are FloPlast Rainwater Systems, and what is the colour coding for them?

Black Jet Black RAL9005
White Signal White RAL9003
Brown Mahogany Brown RAL8016
Grey Grey RAL7046
Cast Iron Cast Iron (Black) RAL9055
Anthracite Graphite Grey RAL7024

What gutter systems are available from FloPlast?

Systems that are available are:
76mm Miniflo Half Round
112mm Half Round
114mm Square Line
110mm Niagara (Ogee)
115mm Hi-Cap (Deep Flow)
170mm Xtraflo

What is the flow rate for the FloPlast hoppers?

RH1/ RHS1 – 1.14 lts/sec = 54.5 sq/mts of roof
RH4 – 2.18 lts/sec = 104.5 sq/mts of roof
RH5 – 2.18 lts/sec = 104.5 sq/mts of roof
RHH1 – 1.66 lts/sec = 79.5 sq/mts of roof

What systems can the FloGuard leaf guard be used with?

Floguard can be used with Half Round, Squareline & Hi Cap.

When do FloPlast recommend the use of silicone spray?

FloPlast recommend the use of silicone spray/ lubricant on all gutter installations. All fittings with seals in need silicone lubricant to assist with the insertion of the gutter.
Washing up liquid would not be suitable for this as it can be detrimental to the rubber seals in the fittings.

Where and how far apart should Downpipe Clips be?

Downpipe clips should be placed below the sockets of offset bends, joints, branches and shoes, and at maximum intervals of 1.8 mtrs.

Which screws should be used to secure fascia brackets to fascia boards?

For 2 hole fixing use 25mm x 5mm non-ferrous round head screws 1 hole fixing use 40mm x 5mm non-ferrous round head screws. Counter sunk screws can be used as long as that during installation care is taken not to overtighten, particularly when using power tools.

Can a joint that is welded by solvent cement be submerged in water?

As long as the joint is set and hardened before then it can be submerged in water.
However it must not be used in fish ponds and must not be used in swimming pools where any pressure from a pump will pass through the system.

Can ABS waste pipes be used externally?

Yes but they must be painted.

Can Air Admittance Valves be used with cesspools or septic tanks?

FloPlast air admittance valves can be used with both a cesspool and a septic tank as long as there is another pipe venting the system between the tank and the air valve. Ideally closer to the tank.
If the system  is not vented and an air valve is installed then this could result in a build up of gasses and potentially an explosion.

Can FloPlast Air Admittance Valves be installed below the flood level of appliances that they are serving?

Yes, 110mm air valves need to be at least 200mm above the highest wet entry point into the stack that they are sitting on.
32mm, 40mm & 50mm air valves need to be branched off at least 100mm higher than the waste pipe carrying the waste water.

Can I fit my AAV to the outside of the building?

FloPlast now manufacture a valve capable of being fitted externally.

Can Polypropylene waste pipes be used externally?

Yes but they must be painted.

Can PVC soil pipes be painted?

Yes, the pipe must be degreased first and then apply 2 coats of any water based gloss paint; the first coat can be thinned.

Can ABS solvent weld waste pipes be connected to Polypropylene?

Yes, use Unicom Compression Waste fittings, similar to those on our trap outlet.

Can PVC-U waste pipes be used externally?

Yes. Painting is not required.

Do any FloPlast Air Admittance Valves have a pressure rating of 10psi (0.7 bar) so that they can be installed with a Saniflo system?

No, FloPlast do not make any air valves that will be suitable for use with a Saniflo system.

Do FloPlast Air Admittance Valves have to be installed vertically?

Yes. All FloPlast AAV’s must be installed vertically with no angle at all.

Do I need to install fire prevention collars when installing a pipe through a wall or floor?

Fire prevention collars are only required when a pipe penetrates through a wall or floor of a neighbouring property, i.e. a block of flats or apartments.
When connecting a pipe through a wall or floor, the use of a fire collar will prevent fire jumps between rooms. The intumescent strip will close the gap and prevent the fire spreading.

Do I need to insulate my AAV?

No, as the operating temperature is -20°C at the lower end insulation is not required.

How do I stop the ‘Gurgling’ effect when I empty my bath?

FloPlast manufacture a range of Air Admittance Valves to overcome this problem. Please refer to our section on Air Admittance Valves within the Soil and Waste pages

How far will 110mm soil pipe push into the fittings?

If the pipe is chamfered then it will push 65mm into the fittings. If it is not chamfered and cut to a straight line then it will push approx 60mm into the fittings

How far will the flexible WC connector (SP106) expand?

The connector will expand from 180mm to 300mm, this is the distance when installed. The overall length of the connector is 385mm and when fully retracted the overall length is 260mm.

How far will the Flexi-Tube (FT32/FT40) extend?

The Flexi-Tubes will be 320mm fully retracted and will extend to 500mm when fully extended.

How far will the TP47T/ TB47T extend?

Both of the telescopic traps will extend from 37mm to 120mm.

How long do you need to leave the Solvent Cement to dry?

When cementing two joints together you will have between one and two minutes before the cement starts to set and you will struggle to move the joints.
The joint will then need to be left for 2-3 hours for short discharges or for a continuous discharge 24 hours.

I am installing a new w.c. pan and the existing Pipe is at a different height to the new outlet.

Use FloPlast SP102 Offset WC Connector, or SP106 Flexible WC Connector.

I am trying to connect pipes that are at a Non standard angle, how do I do this?

FloPlast have 0-90º Adjustable bends in 32mm and 40mm ‘UNICOM’, and 110mm in above ground soil and Underground Drainage.

I need to connect to an existing waste pipe but I am not sure of the size.

FloPlast manufacture a range of Universal compression fittings ‘UNICOM’ which take up any discrepancies in size between different manufacturers or materials.

If I need to fit an old copper or lead pipe what fitting should I use?

FloPlast offer both compression waste fittings, which are multi fit and Flexi-flo adaptors that operate with a screw-on jubilee clip.

In what situation would you use a anti vac bottle trap?

The anti vac bottle traps are used to stop the gurgling between a bath and a wash hand basin.

In what situations would I use a 32mm, 40mm or 50mm Air Admittance Valve?

If a 32mm waste pipe is longer than 1.5 mtrs, a 40mm pipe 3 mtrs, and a 50mm pipe 4 mtrs, then the options are to increase the pipe size to the next size, and/or install an air admittance valve.

A mini air valve can also be added where there are several appliances in close proximity, this will help reduce the possibility of induced siphonage sucking the water from the traps.

What ancillaries can be used with drinking (potable) water?

The ancillaries that can be used with drinking water are SL50 (50g lubricant gel), SG100 (100g Silicone Grease) & SG800 (800g Lubricant Gel)

What are the measurements of the 110mm Air Admittance Valves?

AF110/ AX110 measurements are:
Across the top – 148mm
Overall Height – 122mm
Height when installed (Top of the soil pipe to top of AAV) – 72mm

AV110 measurements are:
Across the top – 148mm
Overall Height – 115mm
Height when installed (Top of the soil pipe to the top of the AAV) – 65mm

What are the operating parameters of FloPlast Air Admittance Valves?

FloPlast’s Air Admittance Valves have been tested in accordance with BS EN 12380 and been designated as A1 – this means that the products have an operating window of -20° C to 60°C.

What bend should be used at the base of 110m soil pipe?

A long radius 87 ½o Rest bend or 2 x 45 o bends, minimum radius 200mm.

What clipping distances should be used for 110m soil pipes?

Vertical pipe sockets should be anchored with socket clip and a pipe clips fitted at 1.8 metres centres maximum Horizontal runs should be anchored at sockets and pipe clips at 1.0 metre centres. Please refer to our Soil & Waste Brochure.

What fire ratings do fire collars have?

FloPlast’s fire collars have a four hour rating.

What fittings do I need to fit my waste Pipe to my soil pipe?

FloPlast produce a range of boss pipes and adaptors. Please refer to our section on bosses and adaptors.
Please refer to our Soil and Waste Brochure.

What is the air flow of the FloPlast Air Admittance Valves?

FloPlast air admittance valves are tested to flow rate and not by pressure:
The 32mm & 40mm air flow rate is 6.5 litres per second.
The 110mm push fit & solvent internal air valves air flow rates are 43 litres per second
The 110mm push fit external air valves air flow rate is 34.7 litres per second

What is the benefit in using Soil Manifolds?

The FloPlast manifold has versatile inlets for the multi connection of up to four connections from 30/40 and 50mm waste pipes in both.

What is the best trap to use?

The most common traps would be the P or S traps for under a sink, or bottle/pedestal traps for basins. When installing appliances please refer to our Washing machine or combination traps.

What is the compatibility with other manufactures?

All 32mm, 40mm and 110mm systems are compatible with all other manufactures and most 50mm systems are compatible with most other manufactures.

What is the conversion from Imperial to metric pipe sizes?

Nominal imperial pipe size    Nominal metric pipe size
1 ¼”                                            32mm
1 ½”                                           40mm
2”                                                50mm
3”                                                82.4mm
4”                                                110mm
6”                                                160mm

What is the suitability of the Flexiflo couplings with certain chemicals?

Please refer to our Flexiflo Connectors section and download our Chemical Resistance Guide.

What materials are used to make the products?

Cellular Fascia, Soffit and Cladding – PVCUe – Poly Vinyl Chloride expanded.
Unicom Compression, Pushfit Waste and some elements of both Above Ground and Underground Drainage – Polypropylene.
ABS (Solvent Waste) – Acrylonitrile Butadiene Styrene.
Above Ground, Underground Drainage and Rainwater – PVC-U – Unplasticised Polyvinyl Chloride.

What size hole needs to be cut out of the soil fittings for the boss adaptors to fit?

The hole size that needs to be cut out is 54mm.

What size pipe will the weather slate (SP320) fit onto?

The weather slate comes with a rubber cone that can be cut to size and will fit onto pipe sizes between 55mm and 170mm.

What size waste pipe do I need to use?

32mm Pipe is used for wash hand basins in the bathroom or cloakroom & 40mm pipe is used for every other appliance.

What temperatures can the Air Admittance Valves work to?

In accordance with BS EN 12380 FloPlast air admittance valves will work between temperatures of -20°C to + 60°C.
With the air valves working at temperatures of -20°C there is also no need of insulation.

What temperatures can the Overflow system withstand?

The pipe will start to soften at 75°c but if it is a constant run then it will start to soften at 55°c.

What traps do I use for wash hand basins?

For wash hand basins you can use a P trap, S trap, Bottle trap or a Pedestal trap

What water temperature can be discharged through soil and waste pipes?

All FloPlast products are tested to the relevant British Standards at 93°C – 95°C. This is an intermittent hot and cold cycle test. Water under continuous discharge should not be hotter than 70°C – 75°C. Water at higher temperatures should be restricted to 2 minutes.

Where would I use a Pedestal Trap?

FloPlast’s pedestal trap new slim line design, fits neatly behind the basin pedestal.

Which waste system (polypropylene or ABS) should I use?

Below are the advantages and disadvantages


Rigid joints
Suitable for external use
Cannot be separated
Easy assembly
Protection from daylight not required

Generally more expensive than Polypropylene systems
Less resistant to impacts than the PP
Temperature resistance is not as high PP
Not as resistant to chemicals as PP


Simple assembly
Cheaper than solvent weld system
Can be separated
Expansion provided to longer waste runs
Flexible joints
Greater resistance to impacts than PVC-U
Capable of withstanding higher temperatures than PVC-U systems

Unable to be used externally without protection from U.V. rays
Support required for joints

Are FloPlast Drainage systems compatible with other plastic manufacturer’s drainage systems?

Yes – our drainage systems are fully compatible with all systems manufactured to BS EN 1401, BS 4660, BS EN 13476-2 and BS EN 13598.

Are the Block Paving covers to be used with the plastic covers and frames?

No, they are to be used instead of the covers and frames.

Can FloPlast inspection chambers be installed internally?

The large inspection chamber can be installed internally provided that it is installed with a double sealed cover (D931)
The mini access chamber can be installed internally with the D830.

Can underground pipe and fittings be used above ground?

Underground pipes and fittings are manufactured to different British Standards to above ground pipes and fittings and are in general Terracotta in colour, which complies with colour coding rules to identify the contents of buried pipelines.
The main difference between underground and above ground is that underground does not have a colour fastness stabiliser.
A building inspector may insist that underground products used above ground should be removed because of the lack of UV stabilisation and that above ground products used underground are removed because of the colour coding rules.

Does the FloPlast underground drainage system have a pressure rating?

No it does not as it is designed to only carry waste water and would not be subject to any high pressure.

Does the underground drainage system have to be installed with a fall?

The fall that will need to be applied does depend on the number of appliances that are going into the system, local authority regulations and the soil condition.
However a general recommendation will be 1:40 to 1:80.

How do I connect 110mm drainage pipe to 160mm drainage pipe?

You can use the FloPlast level invert reducer (D99).

How do I connect the domestic channel drainage to 110mm underground pipe?

FloPlast supply an end outlet which will clip into the end of the channel drainage length and then connect to 110mm pipe.
There are also three circular holes on the bottom of the channel which can be cut out and 110mm pipe placed around the outside of the cut out hole.
This will not be a tight seal but this is fine as it is only rainwater that will be going through the system and gravity will take the water straight down the pipe anyway.

I am trying to connect PVC pipes to Clay pipe, what fittings do I need?

FloPlast produce a range of adaptors to suit this situation, please refer to our section on Underground Drainage Adaptors.

I need to clear debris from my FloPlast bottle gully, but can’t see how?

After removing the grating, twist the internal baffle tube anti-clockwise, and pull out of the body. You will now be able to remove debris caught in the trap and rod the drain it connects to.

If I lay FloPlast pipework to a steep gradient, will this cause any problems with the pipe runs?

There is no maximum gradient; a fall of 1:10 is usually considered as a maximum guideline. BS8301 states “Research has shown that high velocities of sewage flow arising from steep gradients do not cause increase erosion of pipes or deposition of solids.”

In what situation would I need to use the large inspection chamber and not the mini access chamber?

The mini access chamber can only be installed up to depths of 600mm and the large inspection chambers can be installed up to 3m.
If installed up to 1.0m then you can use the single seal cover (D930) and between 1.0m and 3m you will need to use the double sealed cover (D931).

What is a deep inspection chamber?

Building Control Officers as of April 2002 may accept deeper non-man entry inspection chambers to be used for drains and sewers. The opening for these chambers which are installed using 450mm diameter risers must be restricted to 350mm to prevent people falling down them and can be installed up to a depth of 3 metres for fouls or surface water drainage.

What is the recommendation for access in a drainage system?

Please refer to the Building Regulations, Approved Document H1, Section 2, Table 10. Reference to Access is also covered in our Underground Drainage product brochure.

What load capacity can underground drainage inspection chambers lids carry?

All FloPlast Inspection Chamber covers and frames comply with the requirements of BS EN 124.

The Mini Access Chamber Covers D830 and D831 and the Large Inspection Covers D930, D931 and D923 are rated A15 (1.5 Tonne). The Large Inspection Cover D934 is rated B125 (12.5 tonne).

Where do I use the Large Inspection Chamber or Deep Inspection Chamber?

The large inspection chamber and the deep inspection chamber are one and the same product. They have been designed to be used in all situations where access is required, and where the invert level is less than 3 metres. There are restrictions in its use from 1.2 metres – 3.0 metres, please refer to our section on inspection chambers or to our underground drainage systems technical brochure.

Where do I use the new MAC?

The MAC can be used in all situations when access is required, and where the invert level is less than 600mm.

Where would I put a rodding point?

Generally only used in storm water/ rainwater systems, a rodding point is installed at the head of the system.

Where would I use a BIG?

A back inlet gully can be used where additional installation of waste pipe or rainwater downpipes is required.

Why does the FloDrain channel end cap come fitted in the female slot?

This is for packaging purposes only. The end cap will fit into the opposite end or a cut end of the FloDrain channel. Ensure as per our installation instructions that the end cap is installed at the furthest point from the outlet. The end cap can be secured into place using silicone sealant if required.

Why is the Cast Iron Cover and Frame (D923) only to be used for replacement purposes and not for new builds?

Building regulations state that all new builds and newly installed chamber bases must have a screwed down cover and frame on them.
This means that the D923 can only be used on chambers that have been installed before the change in regulations came into place.

For what applications would I use the MDPE system?

The MDPE system is designed for coldwater applications only.

How do I fit the MDPE pipe into the fittings?

You will first need to insert the pipe liner into the pipe (this might be a tight fit and may require a hammer to tap it in gently).
You will then need to loosen the nut on the fitting and push the pipe in as far as it can go and then tighten the nut back up on the fitting.

What is the pressure rating for the MDPE system?

The MDPE fittings have been tested to 16 bars and the pipe has been tested to 12 bars.

What temperatures will the MDPE system withstand?

No hot water should be passed through the system as it is designed for cold water only.
If possible then the system should be installed away from any hot pipe work as it will start to affect the performance of the system with temperatures as little as 30°c.

When installing the MDPE system do you need to protect the system in anyway?

No, there is no need to protect the system. It will just sit in place under the flooring of the house.

Will the MDPE pipe need to be insulated if it is installed above ground level?

If installed externally it should be lagged to protect it from frost and ultra violet degradation.

Can FloFit be connected directly to a central heating boiler?

FloPlast recommend that a minimum run of 1 metre of copper pipe should be installed prior to the first FloFit connection, for further details please refer to BS5955: Part B.

Can FloFit be fitted directly to compression fittings?

FloFit pipes are suitable for use with compression fittings, however a pipe insert must always be used. Compression fittings with a short pipe stop depth or hard olives should not be used with plastic pipe. Hard olives can be replaced with soft copper olives.

Can FloFit be fitted directly to copper pipes?

Yes, as long as the pipe conforms to BS EN 1057.
FloPlast recommend that a minimum distance of 450mm of copper pipe should be installed between the last solder joint and the first FloFit joint to ensure residual flux solder does not come in contact with the fittings.
Flofit fittings should not be fitted or installed on stainless steel pipes, chrome plated copper tube, Imperial sized copper or plain brass spigot ended fittings.

Can FloFit be used for external pipes under ground?

FloFit is designed and classified for internal use only.

Can FloFit be used with alternative plastic systems?

The system is available in 10mm, 15mm and 22mm diameter compatible with all plastic plumbing systems conforming to BS 7291.

Can FloFit be used with Combi Boilers?

Yes, as long as 1m of copper pipe is used straight from the boiler before the first FloFit connection

Can I re-use FloFit fittings?

Yes, FloFit it is a fully demountable system and providing that the O-ring has not been damaged, the fitting can be re-used.

Can the FloFit range be used for underfloor heating?

Yes, FloFit is fine to use for underfloor heating.

Can the FloFit system be re-used?

Yes, the system is fully demountable and providing that the ‘o’ ring inside of the fittings are not damaged then they are fine to re-use.

Can you fit the FloFit system directly onto copper pipe?

Yes, copper pipe will fit directly into FloFit fittings and there is no need to use a pipe insert.

Do central heating inhibitors or descalents affect FloFit?

Central heating inhibitors and descalents do not adversely affect FloFit.
For further advice, companies such as:
• Fernox (0870 601 5000) or
• Sentinel (0151 420 9563)
should be contacted.

Do I need to use pipe inserts and collet clips on every fitting?

Yes, It is essential that pipe inserts and collet clips are used on all installations of the FloFit system.
The pipe inserts need to be pushed all the way into the pipe, up to the small lip at the end of the insert and help keep the pipe rigid.
This will also prevent the fitting from crushing the pipe when fitted together and potentially causing leaks.

Does soft water affect FloFit?

FloFit is designed and suitable for the conveyance of all types of potable water whether soft or hard, including aqueous media such as distilled water, salty (brackish) water and ‘grey’ (ablutionary) waste water.

How does FloFit work?

Each socket consists of an EPDM O-ring and a collet (grip ring) containing the stainless steel grip teeth. When the pipe is inserted into the socket it passes through the collet and the O-ring to form a seal. The pipe is fully inserted when it stops in the bottom of the socket. The pipe should be fully locked into the collet clip – however to ensure a tight fit, pull the pipe firmly backwards from the fitting.

Joints are easy to make, details as follows:

When making a joint with FloFit, ensure that the pipe has been cut square and free from burrs, scratches and sharp edges. FloPlast recommend that all pipes are cut with pipe cutters and not hacksaws.

Do not use damaged or scratched pipe as this could cause a leak.

  • Before assembling the joint, ensure that the appropriate pipe insert has been inserted into the pipe. All joints with either FloFit fittings or compression fittings must include the correct pipe insert.
  • Insert the pipe into the fitting, ensuring it passes through the 0-ring until it reaches the stop point. We recommend that you mark the insertion depth on the pipe as measured from the end of the pipe insert to ensure that the pipe has reached its stop point.  Please refer to the table in our assembly procedures in the Hot & Cold Plumbling Systems section of the website.
    Check the assembly to ensure that the pipe is fully locked by pulling the pipe away from the fitting.
  • To identify hot or cold water circuits, replace the white collet clip with a red or blue collet clip, supplied separately.
  • To dismantle the FloFit fittings, remove the collet clip, push the collet face towards the body of the fitting and pull the pipe out of the socket. No tools are required to dismantle FloFit fittings.

Is FloFit affected by Chlorine?

The FloFit range of pipe and fittings are suitable for carrying normal levels of chlorine found in domestic water supply systems. Whilst the FloFit system can be disinfected with chlorinated water using the concentration level, contact period and procedures described in BS6700, it is not suitable for use on systems where the water contains high levels of chlorine e.g. swimming pools, fountains etc., or areas of high chlorine.

Is FloFit affected by paints and chemicals?

FloFit can be painted with either water or oil based paints. Avoid all contact with cellulose or solvent based paints, thinners, strippers, agressive cleaning fluids or acid-based descalents.

Is FloFit affected by Soldering flux?

FloPlast recommend that no fluxes of any form should be allowed to come into contact with FloFit pipe or fittings. When fluxes are employed in the same area as FloFit, care should be taken to ensure contact does not take place, by ensuring that cloths used on the pipe work are clean and free from flux contamination. Ensure that when handling the pipe work, contamination is avoided through hand contact etc.

Is the FloFit system compatible with other manufactures?

The FloFit system can be used with other manufactures systems but whatever make of fittings you use you must make sure that you use their inserts as well.
The FloPlast PEX pipe will say to use FloPlast inserts, use the insert that matches the fitting.

Is there a guarantee with the FloFit range?

Yes, a 25 year guarantee is offered with the FloFit range.

Should I thermally insulate FloFit pipes and fittings?

The spacing around the piping allows thermal insulation to be fitted in accordance with the Building Regulations or designated specifications.

What different pipes are available and what are the differences between them?

There are two different pipe, PEX and Polybutylene.
PEX pipe is white, more heat retaining and more rigid so is better for straight line installations.
Polybutylene pipe is more pliable so is better for installations around corners.

What is the maximum temperature that the FloFit will withstand?

Temperatures of up to 85°c will be fine to be passed through the system.

What type of systems can FloFit be used on?

The FloFit system is suitable for all domestic and small commerical hot & cold-water installations, including most central heating systems:

  • Mains fed indirect cold water systems
  • Vented and unvented hot water systems
  • Vented and sealed central heating system

FloFit must not be used for:

  • Gas applications
  • Oil fuel applications
  • High pressure air supply

Will FloFit change the taste of water passing through it?

No, FloFit has been fully approved for use in hot & cold water by WRAS. As such, FloFit has been tested by”The Water Quality Centre” and complies with the recommendations of BS6920.

Do you have point of sale material?

A comprehensive range of literature and point of sale material is available from your local representative and the general sales office

How many houses can a 110mm diameter foul water drain carry?

In general a 110mm diameter pipe can carry a maximum number of 20 houses. Building Regulation Doc H advises the use of a 150mm pipe for more than ten houses.

I require technical advice?

Please contact our technical help line on 01795 431731 and we will endeavour to answer your question both accurately and efficiently.

Need a local stockist?

Please contact our Sales office for further information on +44 (0)1795 421422

What is SUDS?

SUDS stands for Sustainable Urban Drainage Systems.
SUDS is the management of rainwater at its source (roofs, car parks etc) with the aim of reducing the possibility of flooding.

What standards apply to your products?

Please refer to section on UK and European Standards.

Where can flexible couplings be used?

Flexible couplings can be used in all above and underground installations. They are primarily for connection to pipes manufactured from other materials i.e. clay or cast iron.