DPM Membrane Insulation

A damp-proof membrane is a moisture-inhibiting foil that is 100% watertight (unlike a breather membrane!). Thus damp – which exists in the surrounding air in the form of condensation – is prevented from penetrating the membrane.

Damp-Proof Membrane

Why do I need a damp-proof membrane?

A damp-proof membrane is needed when using specific insulation materials – such as cellulose, mineral wool, etc. – to prevent damp from working its way into the insulation. Where insulation is concerned, fitting a damp-proof membrane is important, as it safeguards the insulating properties of the material.

The membrane can also be used to protect building structures against damp. For a timber structure, the damp-proof membrane also protects against rot and mould.

Types of Damp-proof membrane

Damp-proof membranes come in various forms.
• (Polyethylene) foils are most widely used.
• Aluminium or aluminated paper are also often used for insulation materials – examples that come to mind include flensing decks and laminated insulation panels.
• Another option is a bituminous course