Vapour Barrier Cold Flat Roof

This wall is a further variation of figure 6 but now it has a class i vapor retarder on the interior a vapor barrier completely eliminating any inward drying potential.

Vapour barrier cold flat roof. Applicability limited to very cold subarctic and arctic regions. Whether you re repairing a flat roof or laying a new one from scratch you ll find all the materials you need here. Including fibreglass roof kits torch on felt and liquid rubber products everything you need for flat roofing is in one place. A vapour control layer helps you shield your building from the consequences of condensation condensation is generated when warm moist air rises and condenses into a liquid on contact with the cooler areas above the insulation.

A vapour control layer or vcl on a warm flat roof sits between the roof decking and the insulation. A flat roof vapour barrier such as iko s mvp modified vapour protector offers appropriate moisture protection. 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. Frame wall with cavity insulation and brick or stone veneer with interior vapor barrier.

The notion behind a vapour control layer is to install it on the room. Flat roof vapour barrier materials when constructing a flat roof there are two types of materials commonly used. Do i need a vapour barrier between the plasterboard and the bottom of the joist. Most diagrams on the internet i have seen have plasterboard on joist insulation air gap osb board then roofing material.

The sloping ceiling areas include closed cell or foil backed rigid board insulants most of which are highly vapour resistant. Bituminous vapour retarders asphalt mixed with felt or fiberglass or non bituminous vapour retarders plastic. Including flat roof vapour barrier for extra secure roofing solutions. I am building a cold flat roof on an extension.

When the temperature of the vapour falls to or below its dew point the water vapour condenses on cold surfaces.