Why choose Toughsheet Damp Proof Membrane

Toughsheet Damp Proof Membrane (300 micron) is a durable black polythene DPM designed to control
ground moisture in floor and foundation constructions. In addition to its primary role as a damp proof membrane,
Toughsheet is widely used during lead roofing works to provide temporary weather protection, keeping decks dry
prior to installing new lead coverings and safeguarding interfaces during refurbishment.

Effective moisture control is fundamental to long-term building performance. Where damp proof membranes are
incorrectly specified, damaged, or omitted, moisture ingress can lead to structural degradation, internal damp
issues and reduced thermal efficiency. Toughsheet DPM provides a continuous, robust barrier when installed as
part of a compliant floor or temporary roofing build-up.

Key benefits

• Reliable moisture resistance: 300 micron polythene forms an effective barrier against rising damp.
• Versatile use: Suitable for ground-bearing floors and as temporary protection during leadwork.
• Durable on site: Tough enough to withstand handling, foot traffic and detailing.
• Flexible installation: Easily dressed around penetrations, laps and upstands.
• Trade trusted: A practical solution for both permanent construction and short-term weatherproofing.

Where Toughsheet DPM is used

Toughsheet Damp Proof Membrane is commonly installed beneath concrete slabs and screeds in domestic and
commercial construction. In roofing and leadwork applications, it is frequently used as a temporary protective
layer to keep roof decks dry before lead sheet installation, and to protect vulnerable interfaces during phased
works.

Good practice & workmanship

Damp proof membranes are only effective when continuity is maintained. Substrates must be clean and smooth,
laps correctly formed and sealed, and penetrations carefully detailed. The same principles apply whether the
membrane is being used permanently within a floor build-up or temporarily during lead roofing works.

For authoritative guidance on substrates, detailing and workmanship standards, see
BS 6229 substrate guidance,
Neal Roofing — BS 6915 leadwork standards,
and the broader system overview provided in
The Lead Handbook.

At a glance — Toughsheet DPM

Always follow project specifications and manufacturer guidance. Temporary protection membranes should be
removed prior to final roofing installation.