Warm Flat Roof Joist Construction

A roof is considered to be flat when it is of a slope of 1 5 o to the horizontal.

Warm flat roof joist construction. Flat roof with no permanent access and altitude not exceeding 100m 0 75 kn m udl 0 9 kn point load most areas exceeding 100m but not exceeding 200m excluding parts of scotland pennines north east england refer to bs 6399 3 1 kn m udl 0 9 kn point load. 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. For guidance on roof insulation please contact us on 44 01257 488 000. Flat roof construction for residential.

Although flat roofs are cheaper to build than pitched roofs they have a shorter life span. Hopefully this video will help explain the difference between warm flat roof construction and cold flat roof construction. This approach uses insulation with no air gap either immediately above or below the roof deck. Old asbestos roofs are often replaced with flat roofs.

A flat roof usually consists of the following. Find warm flat roof cold flat roof insulation solutions at iko polymeric. This video shows detailed drawing. In the warm flat roof construction there is insulation packed into every possible space where air can flow.

This is placed over the roof joists and a board normally external ply is laid on top. Sizes of joists needed for flat roof construction. The reasons for selecting either one will depend on the requirements of the build considering the level of insulation required heat loss and building regulations. Thermoplastic or elastomeric are the most effective and should extend up adjacent walls at least 150mm from the roof surface.

A thermal layer of fibreglass polystyrene or other insulating material should be inserted either above the roof decking the warm roof model which is suitable for homes or permanent residences. There are two main types of flat roof systems to choose from. A cold roof construction will normally comprise of a structural deck on joists or purlins with a ceiling layer fixed to the bottom of the joists purlins thereby creating an air layer or cavity. Or else on the interior of the building just.

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.