DPM Damp-Proof Membrane 4m x 25m

DPM Damp-Proof Membrane 4m x 25m  is a heavy-duty polythene moisture barrier engineered to prevent rising damp from penetrating ground-bearing floors. Manufactured from high-quality low-density polyethylene (LDPE), this 100m² roll is the go-to choice for builders, groundworkers, and serious DIYers who need a reliable, regulation-compliant damp-proofing solution beneath concrete slabs, screeds, and insulation layers.

Key Features and Specifications

• Dimensions: 4m wide × 25m long — 100m² coverage per roll
• Material: Low-density polyethylene (LDPE) polythene sheeting
• Colour: Black
• High tear resistance: Reduces risk of damage during installation and concrete placement
• Flexible construction: Withstands structural movement and conforms to sub-base profiles
• Compliant with BS EN 13967:2012 — flexible sheets for waterproofing
• Meets UK Building Regulations for ground-floor moisture protection
• Compatible with DPM jointing tape for sealed overlaps at sheet junctions
• Brand: Principal Building Products Ltd

Applications

• Below concrete ground-bearing slabs in new-build housing and light-commercial construction
• As a separating layer beneath sand-and-cement or liquid screeds
• Under rigid floor insulation boards prior to concrete placement
• Renovation and refurbishment floor build-ups where existing DPM is absent or damaged
• Sandwich construction between base concrete and screed finish
• Turned up at perimeter walls to link with the damp-proof course (DPC) for a continuous barrier

Why Choose This Product

Principal Building Products Ltd supplies this damp-proof membrane in a practical 4m × 25m roll format that minimises joints on wide floor areas, reducing the risk of moisture ingress at laps. The tear-resistant LDPE construction handles the rigours of a busy site — from laying over sand blinding to withstanding foot traffic before the slab is poured. At 100m² per roll, it offers strong value for trade quantities, and its compliance with BS EN 13967:2012 and UK Building Regulations gives specifiers and building control officers the assurance they need.

Delivery in and Around London

We deliver the DPM Damp-Proof Membrane 4m x 25m to inner London boroughs including Croydon, Lewisham, Southwark, Camden, and Hackney, as well as Greater London areas such as Enfield, Bexley, Redbridge, and Barnet. We also serve the surrounding counties of Kent, Essex, Surrey, and Hertfordshire. Trade quantities are welcome — contact us for pallet pricing and scheduled site deliveries.