Order damp proofing for delivery in Harpenden

Damp Proofing & Membranes available for Harpenden delivery

• 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.
• DPC rollsPolymer and bitumen damp-proof course in standard wall widths.
• Radon barriersGas-resistant membranes for areas that need radon protection.
• DPM sheetingHeavy-gauge polythene membrane under concrete floors.

How much will you need?

An extension in Harpenden with 24 m of cavity wall needs DPC in both leaves: about 2 rolls in 30 m lengths once laps are allowed for. A 20 m² floor slab needs about 23 m² of DPM including laps, which is 1 roll of 4 × 25 m sheeting.

Before you order damp proofing

Laps and joints

DPM and DPC need generous laps and sealed joints; follow the manufacturer's guidance.

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.

Delivery to Harpenden: what helps

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

• On busy streets in Harpenden, a parking suspension or a quiet time slot can make offloading safer, so tell us about local restrictions you know of.
• If the site is up a shared drive or behind other houses, tell us the distance from the road.
• Clear a level area for pallets, ideally on boards, so materials stay out of standing water.

Common questions from Harpenden

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.

Where does the DPC go?

Usually at least 150 mm above outside ground level, linked to the floor DPM.

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

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 Harpenden?

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.