Damp Proofing & Membranes for Sevenoaks, delivered to site

Which damp proofing can you order in Sevenoaks?

• Radon barriersGas-resistant membranes for areas that need radon protection.
• DPC rollsPolymer and bitumen damp-proof course in standard wall widths.
• Cavity trays and stop endsTo direct water out of the cavity over openings.
• Weep ventsFor drainage and ventilation at the base of cavities and over trays.
• DPM sheetingHeavy-gauge polythene membrane under concrete floors.

Delivery to Sevenoaks: what helps

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

• Give us the full postcode for the drop point; deliveries around TN13 are priced to the exact address.
• If neighbours share the access, it helps to let them know a lorry is coming.
• On busy streets in Sevenoaks, a parking suspension or a quiet time slot can make offloading safer, so tell us about local restrictions you know of.

Working out quantities for your Sevenoaks job

An extension in Sevenoaks with 16 m of cavity wall needs DPC in both leaves: about 2 rolls in 30 m lengths once laps are allowed for. A 50 m² floor slab needs about 57.5 m² of DPM including laps, which is 1 roll of 4 × 25 m sheeting.

Damp Proofing & Membranes: choosing well

DPC width

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

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.

In England, building work is checked against the Approved Documents, for example Part A for structure and Part L for energy efficiency, through your council's building control team or a registered building control approver.

Damp Proofing & Membranes in Sevenoaks: questions

Do you deliver damp proofing to trades and homeowners in Sevenoaks?

Both. Trades can apply for a trade account; homeowners and self-builders can order on a delivered quote.

How soon can damp proofing be delivered in Sevenoaks?

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.

Do I need a radon barrier?

It depends on where you are. In radon-affected areas building control requires radon protection in new buildings and extensions.

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.