Vapour Control Layer Flat Roof

A vapour control layer or vcl on a warm flat roof sits between the roof decking and the insulation.

Vapour control layer flat roof.

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. The flat roof has 2 roof lanterns. A vapour control layer is designed to catch this vapour preventing it from condensing on the insulation or elsewhere in the loft space or attic. With any warm flat roof detail such as this a vapour control layer should have been laid on top of the roof deck underneath the insulation.

Vapour control layer for a cold roof. The vapour control layer vcl often overlooked underrated punctured adlib and sometimes even completely omitted mainly because we re just not sure if it really is all it s cracked up to be after all even if we leave it out altogether the roof shouldn t leak right. However the cross ventilation does not completely remove the moisture vapour in the ceiling void and a vapour control layer sealed at joints and penetrations is required under the insulation and over the plasterboard to provide a barrier against moisture vapour rising up from the room below. If this has not been done then we would recommend that you install one underneath the joists before the plasterboard goes up.

Sika sarnafil watchmead welwyn garden city al7 1bq 01707 394 444. Vapour control layers vcl. The type of 3 layer roof. A question for the experts.

I have a 3 layer. Hi i m in the process of building a single story flat roof extension. I have been looking through insurance and they seem to ask about type of flat roofs. The notion behind a vapour control layer is to install it on the room.