Order damp proofing for delivery in Caernarfon

Choosing from our damp proofing range

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

Quantities: a worked example

An extension in Caernarfon with 20 m of cavity wall needs DPC in both leaves: about 2 rolls in 30 m lengths once laps are allowed for. A 30 m² floor slab needs about 34.5 m² of DPM including laps, which is 1 roll of 4 × 25 m sheeting.

Planning the drop in Caernarfon

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

• For a phased build we can split the order so materials arrive as each stage starts, which keeps the site clear.
• Weight limits on bridges or private roads near the site matter for larger lorries, so mention any you know of.
• Tell us the best drop point, such as a driveway, front garden or the kerb, and whether a lorry can park close to it.

Before you order damp proofing

DPC width

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

Laps and joints

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

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.

Damp Proofing & Membranes questions

Can you deliver damp proofing to a site with restricted access in Caernarfon?

Usually, yes. Tell us about the access when you ask for a price and we will plan the vehicle and offload, or say if a smaller vehicle is needed.

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

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

Do you supply cavity trays?

Yes, with stop ends and weep vents for openings and abutments.

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.