Interstitial Condensation Roof

Condensation risk analysis for the glasgow school with the dew point indicated under the membrane.

Interstitial condensation roof. Interstitial condensation can occur in solid and cavity wall properties and happens when pressure and temperature differences force warm humid air through hygroscopic water absorbing materials until they reach a point cold enough for it to condense upon a surface. Interstitial condensation can cause deterioration or even failure of the components of the assembly potentially shortening their useful lifespan. Interstitial condensation can create structural dampening that occurs when moist air penetrates inside the hidden space within an enclosed wall roof or floor cavity structure. Interstitial condensation is a form of structural damp that occurs when warm moist air penetrates inside a wall roof or floor structure.

It is important to ensure an element is designed to avoid interstitial condensation or to create an adequate ventilation solution to remove any condensation that forms. Interstitial condensation commonly occurs when moist air permeates through elements of the building fabric across which there is a temperature difference typically but not always when warm moist internal air moves towards the cooler outer parts of external walls or roofs driven by a pressure difference. Interstitial condensation is when the condensation is formed in the core of the structure while surface condensation is formed on the inside surface of the wall or roof. This type of roof has normally been used over small extensions to dwellings using timber joists and plywood.

Interstitial condensation can cause deterioration or even failure of the components of the assembly potentially shortening their useful lifespan. Therefore it is of paramount importance to ensure that any roofing materials used are designed in a way of which prevents interstitial condensation by creating adequate amounts of ventilation that removes any condensation build up. In a warm roof construction the principal thermal insulation layer is located above the structural decking. Condensation risk analysis cra.

Interstitial condensation is different from surface condensation such as that caused by cold bridging and its occurrence within the roof or wall structure of a building is difficult to detect without investigation. It is the result of the interaction between a complex set of factors. Inside the roof wall or floor elements. Flat roof construction thermal design and condensation warm roof.

Interstitial condensation is a type of condensation which takes place between layers of a structure. Interstitial condensation is condensation which occurs between layers of the construction i e. Inside the roof wall or floor elements. The moisture laden air can penetrate into hidden interstitial wall cavity through the exterior in a warm humid outdoor period and from inside the building during.

When that moisture laden air reaches a layer inside the interstitial structure that is at dew point temperature it condenses into liquid water on that surface.