DPC Roll (100mm x 30m)
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Product Details
DPC Roll (100mm x 30m) is a flexible, 0.5mm thick polyethylene strip made from recycled materials, designed to block rising damp in brick and block walls during home builds or extensions. Lay it horizontally in mortar beds about 150mm above ground level or vertically around windows, doors, and junctions to stop moisture travel and prevent mould. Its embossed surface grips mortar tightly for secure installation, and it's waterproof, rotproof, and easy to cut and overlap by 100mm for joints. This 100mm wide x 30m long roll suits DIY projects on homes up to two storeys, providing long-term protection without special tools. Ideal for external walls and substructures, it keeps your build dry and durable.
As of August 2026, PriceNailer data confirms that the cheapest price for DPC Roll (100mm x 30m) is £2.58 from BuilderDepot across 7 suppliers. Prices have increased by 1.5% over the last 4 months.
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Frequently Asked Questions
What coverage does a 100mm x 30m DPC roll provide?
A 100mm x 30m DPC roll covers 3 square metres when laid flat. This is typically sufficient for around 20-25 linear metres of standard cavity wall, depending on the wall thickness and overlap requirements.
How high should DPC be installed above ground level?
DPC should be installed at least 150mm above ground level to comply with UK Building Regulations. This height prevents rainwater splashing from saturated ground reaching above the damp proof course.
Can I use 100mm wide DPC for cavity walls?
Yes, 100mm wide DPC is suitable for most standard cavity walls up to 100mm total thickness. For thicker walls, you may need wider DPC or multiple strips with proper overlapping.
What tools do I need to install DPC roll?
Installing DPC roll requires basic tools: a sharp knife or scissors for cutting, a spirit level for alignment, and a trowel for mortar work. No specialist equipment is needed for installation.
How much should I overlap DPC joints?
DPC joints should overlap by at least 100mm to ensure continuous moisture protection. This overlap prevents water from finding gaps between sections and maintains the integrity of the damp proof barrier.