Flat Roofing Warm Flat Roof Fascia Detail

From there the flat roof system you choose will determine the materials you apply.

Flat roofing warm flat roof fascia detail. A vapour control layer must be used below the insulation. The basic construction of a flat roof starts with roofing timber that is laid across two upright items usually two walls. Whatever new flat roof covering you choose epdm rubber kemper liquid rubber triflex mariseal etc. Due to the insulation being over the top of the roof the timber structure beneath is warm which is why the term warm roof is formed.

Flat roofing is a popular choice for garages homes garages extensions and many other types of buildings. Traditionally domestic flat roofs use two or more built up layers of bituminous felt as their weather proofing. Good question theoretically when building a warm roof the vaper control layer goes on the warm side of the insulation. This option avoids the requirement to ventilate the roof.

Front fascia flat roof detail. If the specification of the insulation is not correct you could have problems. Having a manual for warm flat roof construction with details and a summary of rules to follow helps. A 50mm air gap must be left above the insulation and allowance for venting must be made at roof perimeters.

For additional stability you can also use steel joists that are built into one or both of the walls. Liquid applied systems such as glass fibre were introduced and are now quite widely used. Flat roof joists spanning the shorter length of the roof form the load bearing members of the structure. In this video our principal surveyor steven dickinson explains problems with insulating a roof using the warm and cold roof construction methods.

If you put insulation under the decking and between the joists you lower the temperature of the decking and lower the due point thus bringing it closer to the danger point of being in the building. This approach uses insulation with no air gap either immediately above or below the roof deck. A warm flat roof is formed by placing a layer of insulation over the top of the roof structure. A timber decking is then constructed and its weight supported by the joists.

Single ply membranes are also used but are particularly suitable for larger roofs. This is where the insulation is typically packed between the rafters. 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.