Interstitial Condensation Flat Roof

Interstitial condensation is condensation which occurs between layers of the construction i e. We ve been talking to ian dryden business development manager at sig roofing about an increasing concern he has for flat roofs built in the 1980s and early 1990s and incorrectly refurbished roofs which appear to be leaking but they aren t. Cold there s a small air vent in the room and an electric heater which hardly changes anything.

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This process sounds similar to that of surface condensation but the two do have their differences.

Interstitial condensation flat roof.

Your roof space should let stale warm air out and fresh cool air in. There is evidence that suggests that condensation in cold deck flat roofs is a problem. For the control of condensation in roofs including cold deck roofs bs 5250. Over time this excess moisture can lead to the unseen decay in roof timbers and fixings.

Check it isn t interstitial condensation. Inside the roof wall or floor elements. Interstitial condensation can happen if warm air from inside th. I d like to fit a downstairs loo in.

Although this image is of a pitched roof both flat roofs and pitched roofs have warm and cold spaces. Condensation in a cold roof. Interstitial condensation can cause deterioration or even failure of the components of the assembly potentially shortening their useful lifespan. Condensation can cause a number of problems within a building particularly interstitial condensation which can occur inside the roof s structure.

A build up of interstitial condensation can affect all areas of a property through the penetration of walls floors ceilings and most specifically for this article the roof structure. Time and time again i see the wrong vaper control layer being used and installed incorrectly. 2002 provides guidance on the principal forms of construction. The lack of ventilation increases the risk of interstitial condensation forming on the underside of the felt membrane causing it to settle on the timber rafters.

This type of roof has normally been used over small extensions to dwellings using timber joists and plywood deck. They should be avoided therefore because interstitial condensation is likely and its effect on the structure and. Condensation within a flat roof mainly occurs during cold weather when moisture vapour in the air which has been generated within the heated building rises from the room below into the cold roof void above the ceiling. Because the waterproofing layer constitutes a vapour control layer on the cold side of the insulation there is a high risk of harmful interstitial and surface condensation on the underside of the deck or the upper surface of the.

Interstitial condensation is a particular problem in cold deck roofs where the insulation is. Flat roof extension has bad condensation and damp and is v.