Warm Roof Construction Flat Roof Details

Flat pitched cold warm roofs flat roofs.

Warm roof construction flat roof details.

For additional stability you can also use steel joists that are built into one or both of the walls. Warm roof build ups can be installed on most modern construction material types such as concrete timber and timber based sheets. Steve from london flat roofingexplains how warm flat roof construction works in this excellent short video. The construction of the flat roof is similar to that of the timber upper floor.

A pitched or slanted roof has a terrain of at least 15 but it is often much more. With a warm roof the insulation is installed on top of the existing surface rather than in between the rafters. Having a manual for warm flat roof construction with details and a summary of rules to follow helps. Joists are placed on edge spaced at 400 600mm centres supported by external and internal load bearing walls.

From there the flat roof system you choose will determine the materials you apply. They can be built up from profiled metal decks as the insulation selected would provide enough rigidity to span the open sections of such decks. Trada and approved document part a give guidance on sizes of joists for flat roofs relating to spans and loading. 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.

If you re worried about the security of your domestic extensions whether they be garages sheds. Underneath the basics flat roofs are usually constructed with a ceiling nailed to joists which support a deck usually wood in residential construction a vapor barrier insulation and a roof board. The insulation is placed below the waterproof covering and is either mechanically fixed or bitumen bonded on to the top of the deck. This air is vented at either end of the roof to allow a continuous air flow.

Put simply a warm flat roof has insulation of some kind packed into every available void and a cold flat roof allows air to circulate between the joists. A warm flat roof is formed by placing a layer of insulation over the top of the roof structure. Warm roofs offer a superior thermal performance and therefore come with a higher cost. Pitched or sloping roof.

The sandwich warm deck roof is the most common type of flat roof. The basic construction of a flat roof starts with roofing timber that is laid across two upright items usually two walls.