Cold Deck Flat Roof Ventilation

Ventilation is required to the underside of the deck.

Cold deck flat roof ventilation.

When thermal insulation is placed below the deck the ventilation must. In a cold roof construction the sarnafil membrane is installed directly to the structural decking usually timber with firrings to fall. When placed below the structural deck. A cold roof is the most common type of roof construction often taking the form of an uninhabited storage space.

Guidance advice on warm cold. Ventilation is required for these roofs. No insulation is on top. Introduction warm cold roofs this guidance offers guidance on the difference benefits between warm and cold roofs.

A cold deck roof is where the insulation is placed between the joists rafters or in between the ceiling joists in the case of a pitch roof. Ventilation is not needed in a warm roof. In this way the roof itself is kept cold. Warm deck the type of insulation for this is usually of a rigid type and the thickness will vary depending on the manufacturer s specifications.

You only need ventilation in a cold roof. Ventilation is required for these roofs. What is flat roof ventilation. There must be an adequate void minimum 50mm between the deck and the insulation traditionally mineral wool to allow free movement of air and to prevent moisture vapour being transmitted from the building outwards where it could condensate in the roof.

This cold deck construction is considered problematic in the humid temperate climate of the uk where the effective ventilation of restricted roof voids may be impractical particularly in sheltered built up areas. Cold deck this is where the insulation is placed between the joists rafters or in between the ceiling joists in the case of a pitch roof. There are two types of flat roof systems warm and cold roofs which affect the positioning of the ventilation.