Warm Deck Flat Roof Construction Detail

Roof deck providing the base for the waterproof membrane and in some cases the insulation.

Warm deck flat roof construction detail.

Depending on the type of roof you are considering here s some technical details you may find useful. Waterproof membrane to prevent water penetrating the structure and interior of the building. The definition of a flat roof according to bs 6229 is having a pitch less than 10 o to the horizontal however some in the industry would consider up to 15 o as their definition of a flat roof. Details both in 2d and 3d to give a clear understanding.

Flat roof details and information relating to insulating a flat roof. In a warm flat roof construction the insulation is positioned above the structural deck and no ventilation is required. With the warm roof deck. There are two forms of warm deck roof.

Others would treat even steeper pitches as flat roofs. 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. The warm deck roof design is the modern method for flat roof construction and is preferred wherever this option is possible. The sandwich warm deck roof is the most common type of flat roof.

This is placed over the. Nhbc recommend that this type of roof be considered as the standard form of construction. The major difference between the warm flat roof and the cold flat roof has to do with the air flow between the roofing timbers known as joists that help to hold up the roof. An inverted roof construction sees the principal thermal insulation layer located above the roof structure and also above the waterproofing this method results in the waterproofing the structural deck and the support structure all being at a temperature similar to that of the interior of the building.

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. When building a flat roof it is vital that a degree of falls is built into the construction to ensure rainwater run off.