Damp Proofing & Membranes delivery in Risca

What damp proofing can we deliver to Risca?

• Liquid DPM and tankingCoatings for screeds and below-ground walls.
• Weep ventsFor drainage and ventilation at the base of cavities and over trays.
• DPM sheetingHeavy-gauge polythene membrane under concrete floors.
• Cavity trays and stop endsTo direct water out of the cavity over openings.
• Radon barriersGas-resistant membranes for areas that need radon protection.

Working out quantities for your Risca job

An extension in Risca with 16 m of cavity wall needs DPC in both leaves: about 2 rolls in 30 m lengths once laps are allowed for. A 40 m² floor slab needs about 46 m² of DPM including laps, which is 1 roll of 4 × 25 m sheeting.

Choosing damp proofing

Is radon protection needed?

Parts of the UK need radon protection in new buildings and extensions. UKHSA radon maps show the areas; building control will tell you what applies.

DPC width

Match the DPC width to the wall leaf so it runs the full width of the masonry.

Wales has its own Approved Documents, including its own Part L for energy efficiency, and building control is handled by the local authority or a registered approver.

Getting damp proofing onto your Risca site

Rolls are light enough to travel with a mixed load and are handed off at the kerb. Risca is inside our standard mainland delivery area.

• Keep cement, plaster and boards dry: have a tarpaulin or a garage space ready before they arrive.
• Weight limits on bridges or private roads near the site matter for larger lorries, so mention any you know of.
• If neighbours share the access, it helps to let them know a lorry is coming.

Damp Proofing & Membranes questions

What is the difference between DPC and DPM?

DPC is a strip built into walls to stop damp rising through the masonry. DPM is a sheet laid under a concrete floor slab. They are lapped together so there is no gap.

Can I add other materials to my Risca delivery?

Yes. Put everything on one list, from damp proofing to fixings and PPE, and we will price it as one delivery where the products can travel together.

How soon can damp proofing be delivered in Risca?

We confirm the delivery date when we price your order, before you commit. It depends on the product, the quantity and whether it is a stock line or made to order.

How thick should a DPM be?

1200-gauge polythene, around 300 microns, is a common specification for floor slabs. Your design may call for something different.