Walls plaster

Interstitial Condensation

Interstitial condensation is moisture forming within a wall, roof or floor build-up, rather than on the room-facing surface.

Warm moist air or water vapour can move into a building element and reach a colder layer where condensation occurs. Because it is hidden, damage to insulation or timber may develop before a stain appears indoors.

The risk matters when adding internal insulation or dry lining to an Edinburgh solid stone wall. The appropriate arrangement depends on the whole wall build-up, its exposure and its ability to dry; a generic vapour barrier detail is not suitable for every traditional property.

Before upgrading a wall or roof, assess moisture risks in the proposed construction and existing fabric. Interstitial condensation differs from surface condensation, which occurs on a visible cold face.

Property types

Commonly found in

Tenement Georgian Townhouse Victorian Villa Terraced House Georgian Flat Converted Flat Detached House Semi-detached House

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