Frequently asked questions

Choose a category/topic below and look through our large selection of frequently asked questions. If you cannot find what you are looking for then please get in contact with us.

Soil

• Can an Air Admittance Valve be fitted externally?
• What height can I fit an AAV?
• How do I connect Polypropylene waste pipes together?
• What temperature of water can I continually discharge through soil and waste pipes?
• Can I connect Marley’s 110mm &160mm soil and waste pipes to a competitor product?
• Can I connect MUPVC -ABS solvent weld waste pipes to Polypropylene?
• Can I paint PVC soil pipes?
• What fall can I fit waste pipes?
• What clipping distances do I use for 110mm soil pipes?
• What bend should I fit at the base of a 110mm soil stack?
• What diameter pipe do I use to connect the following: Sink, Bath, Basin or Shower Connection?
• What is the maximum length of waste pipe can I fit to: Sink, Bath, Basin or Shower?
• Can I fit ABS waste pipes externally?
• Can I fit Polypropylene waste pipes externally?
• Can I fit MUPVC waste pipe externally?
• How do I connect waste pipes to a soil stack?
• Should l allow for expansion on soil pipes?
• Should l allow expansion on waste pipes?

Rainwater

• Can I fit gutters level?
• At what centres do I fit fascia brackets?
• How do I control expansion and contraction?
• What screws do I use to secure the fascia bracket to the fascia board, in order to fit gutter?
• How should gutters be installed?
• How should the eaves edge be finished?
• Do you make special gutter angles?
• Can I interchange your gutter system with a competitors product?
• How can I connect half round cast iron gutters to your plastic half round systems?
• What sizes are your rainwater downpipes?
• Can I fit your 68mm rainwater downpipes to 2½" cast iron?
• Will your rainwater downpipes interchange with a competitors product?
• Do I need to fit a gully at the base of rainwater pipe?
• How do I connect a waste pipe to gully?
• Do you carry spares for your old gutter systems?
• At what centres should I fix your rainwater downpipes?
• What maintenance is required for gutters and rainwater downpipes?
• What guarantee do you give?

Underground

• What is the gradient (fall) for 110mm pipes?
• Can I fit a drain steeper?
• How deep can I fit a 450mm chamber?
• How deep can I fit a 250mm inspection chamber?
• Is it recommended to surround your underground drainage pipe in concrete?
• What do I do if I have to use concrete?
• Do rats attack plastic underground pipes?
• Do tree roots penetrate pipe sockets?
• Can I fit a ring seal joint a joint against flow?
• How long will PVC pipes last?
• How do I fit a waste pipe to a drain?
• Do you have gully’s that have rodding facilities?
• Will your underground pipes interchange with competitor products?
• How do I connect to thin wall or old salt glaze drains?
• What weight can the following components withstand: 250mm lid UCL2, UCL3; 450 chamber cover & frame UCL35; 450 chamber cover & frame; UCL35PP+ UCLRR; 450 chamber cover & frame UCL125?
• Do I bed the pipes and chambers in pea gravel?
• Do plastic drains block up, more than older type clay drains?
• What is the maximum depth I can fit PVC drains?

Sustainable Drainage

• What is the difference between infiltration and attenuation?
• What does the acronym SUDS stand for?
• What part of the Building Regulations relates to SUDS?
• What is PPG25?
• How can a Waterloc installation be designed to provide access to the inlet pipe and allow inspection of the soakaway?
• What storm return period is required, according to the Building Regulations for the design of infiltration systems?
• When designing attenuation systems for greenfield sites, what is the maximum allowable discharge rate generally required by the Environment Agency?
• What are the maximum flow rates for water entry using the different methods?
• What is the recommended maximum installation depth for: a) Waterloc? b) Waterloc HD?
• What is the minimum cover above the Waterloc cells for areas subject to vehicular traffic?
• Why should cell connectors be used?
• What recommendation should be given regarding the depth of attenuation systems relative to ground water level?
• It is recommended that an infiltration system is installed at least 1m above ground water table level. Why is this?
• What is minimum distance between a building and an infiltration installation?
• What is the difference between the CIRIA and BRE methods of hydraulic design of an infiltration system?
• There is a 1:3650 chance of a 10 year storm happening tomorrow. How is this probability arrived at?
• What’s the main principle of SUDS?
• What part of the Building Regulations in the UK relates to SUDS?
• What is PPS25?
• In Scotland, If a developer wishes to provide private drainage, does it still need to be constructed to Sewers for Scotland 2 (SfS2)?
• What is the major benefit of Waterloc250 over other products?
• How can silt and debris be prevented from entering soakaways and attenuation tanks?
• How can a Waterloc 250 installation be designed to provide access to allow inspection of soakaway and attenuation tanks?
• What are the design factors that should be taken into account when sizing an infiltration or attenuation system?
• What is the recommended maximum installation depth for Waterloc250?
• What is the minimum cover above the Waterloc 250 cells for areas subject to vehicular traffic?
• Why should I use cell connectors to connect Waterloc 250 cells together?
• What recommendation should be given regarding the depth of attenuation systems relative to ground water level?
• What is the recommended material for a) Bedding? b) Side/backfill?
• What is minimum distance between a building and an infiltration installation?
• What types of fabric/material are/is used with: a) an infiltration system? b) an attenuation system?
• How should stormwater be discharged into a Waterloc 250 infiltration system?
• Who dictates the flow rate into the downstream water course or stormwater system?
• Should attenuation systems with vented?
• What is the main benefit of using our Flowloc vortex flow control device?
• Can orifice plates be used instead of a vortex flow control device?
• What orifice plate sizes are available?
• What size mesh is fitted to the USW29 filter box?
• What size mesh is used in the filter used in the 250mm silt trap, USWST?

Waste

• How do I connect Polypropylene waste pipes together?
• What temperature of water can I continually discharge through soil and waste pipes?
• Can I connect Marley’s 110mm &160mm soil and waste pipes to a competitor product?
• Can I connect MUPVC -ABS solvent weld waste pipes to Polypropylene?
• What fall can I fit waste pipes?
• What diameter pipe do I use to connect the following: Sink, Bath, Basin or Shower Connection?
• What is the maximum length of waste pipe can I fit to: Sink, Bath, Basin or Shower?
• Can I fit ABS waste pipes externally?
• Can I fit Polypropylene waste pipes externally?
• Can I fit MUPVC waste pipe externally?
• How do I connect waste pipes to a soil stack?
• Should l allow expansion on waste pipes?