What Is A Damp-proof Membrane?

What Is A Damp-proof Membrane?

A damp-proof membrane is a moisture-inhibiting foil that's a hundred% watertight (not like a breather membrane!). Thus damp – which exists within the surrounding air in the type of condensation – is prevented from penetscore the membrane.

Why do I need a damp-proof membrane?
A damp proof membrane-proof membrane is required when using sure insulation supplies – similar to mineral wool, cellulose, etc. - to stop damp from working its means into the insulation. Where insulation is worried, fitting a damp-proof membrane is necessary, because it safeguards the insulating properties of the material.

The membrane can also be used to guard building structures against damp. For a timber construction, the damp-proof membrane affords safety in opposition to rot and mould.

Damp-proof membrane types
Damp-proof membranes come in several forms.

(polyethylene) foils are most widely used
aluminium or aluminated paper are also often used for insulation materials - examples that come to thoughts include flensing decks and laminated insulation panels.
another answer is a bituminous course
For which spaces?
A damp-proof membrane is especially advisable for roofs that have a low-water-permeable course. This holds true for most roof frames of sloping roofs and platform roofs. In addition, a damp-proof membrane is a good idea in poorly ventilated kitchens and bathrooms and for exterior walls that do not enable loads of damp to get via, equivalent to walls constructed with glazed bricks.

In case you are doubtful as to the necessity of a damp-proof membrane, the perfect thing to do is to play it safe. The price of a damp-proof membrane is negligible, but it is going to help to save your investment within the protecting materials.

Take care when fitting
Installing a damp-proof membrane isn't a specialist job. Nevertheless it does require care and attention.

If the damp-proof membrane is meant to protect insulation material, be certain it's always fitted beneath the insulation material. This is the one approach that it'll block humid air (inside your property) before it reaches a cold space when this damp air will condensate.

The damp-proof membrane solely does what it is speculated to do if it has been fitted perfectly.


What is a breather membrane?
A breather membrane is positioned on the cold side of the wall insulation (outer side of the development) with a view to forestall humidity from coming into the building without reducing the insulating effect.

In contrast to a vapour barrier, breather membranes are vapour permeable which will assist evacuate indoor humidity.

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