Warm Deck Flat Roof Ventilation

Thickness varies according to the manufacturer s specifications.

Warm deck flat roof ventilation.

In flat roof construction thermal insulation can be placed above and below the structural roof deck or waterproofing layer. Flat roof u value 0 18 w m2k 2 warm deck flat roof the type of insulation for this is usually of a rigid type and the thickness will vary depending on the manufacturer s specifications. Throughout the course of the year the roof deck and all below it is kept at a temperature close to that of the inside of the building therefore the roof structure is protected from extremes of hot and cold lessening the. Ventilation is required for these roofs.

This is placed over the roof joists and a board normally external ply is laid on top. For a simple duo pitch roof bs 5250 specifies sufficient ventilation as being. Ventilation is required to the underside of the deck. Flat roof ventilation allows for the circulation of air in the property particularly for warmer rooms in residential buildings.

Adequate ventilation must be provided between the insulation and the underside of the roof deck to prevent the risk of interstitial condensation forming within the void area. This cold deck construction is considered problematic in the humid temperate climate of the uk where the effective. Find warm flat roof cold flat roof insulation solutions at iko polymeric. What is flat roof ventilation.

The roof itself is therefore kept warm. By majority the rule of thumb is that in a domestic house not flats approximately a third of the total thermal performance of insulation can be placed below the deck with two thirds above the deck sometimes this is called a hybrid warm roof. When placed below the structural deck. When thermal insulation is placed below the deck the ventilation must.

If ridge or eaves ventilation is not possible ventilation tiles can be used at high or low level to achieve the required airflow. 25mm at eaves on each slope and 5mm at ridge. In a warm flat roof construction the insulation is positioned above the structural deck and no ventilation is required. Hopefully this video will help explain the difference between cold flat roof construction and warm flat roof construction this videos show detailed drawings.

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. 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. Warm roof ventilation specification.