Flat Roofing Warm Flat Roof Fascia Detail

The basic construction of a flat roof starts with roofing timber that is laid across two upright items usually two walls.

Flat roofing warm flat roof fascia detail.

Liquid applied systems such as glass fibre were introduced and are now quite widely used. This option avoids the requirement to ventilate the roof. Flat roofing is a popular choice for garages homes garages extensions and many other types of buildings. A 50mm air gap must be left above the insulation and allowance for venting must be made at roof perimeters.

This is where the insulation is typically packed between the rafters. Having a manual for warm flat roof construction with details and a summary of rules to follow helps. For additional stability you can also use steel joists that are built into one or both of the walls. If the specification of the insulation is not correct you could have problems.

The roofs have a timber frame as the supporting structure. Flat roof joists spanning the shorter length of the roof form the load bearing members of the structure. Whatever new flat roof covering you choose epdm rubber kemper liquid rubber triflex mariseal etc. Steve from london flat roofingexplains how warm flat roof construction works in this excellent short video.

This approach uses insulation with no air gap either immediately above or below the roof deck. 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. 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. Cad details document name pdf dwg download all cad construction details 37 1 mb 3 4 mb mc01 identification of roof areas 694 kb 167 kb mc01a single layer underlayment 678 kb 302 kb mc01b double layer underlayment 711 kb 322 kb mc02 vent pipe flashing 626 kb 349 kb mc03 valley.

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

A timber decking is then constructed and its weight supported by the joists. In this video our principal surveyor steven dickinson explains problems with insulating a roof using the warm and cold roof construction methods. A vapour control layer must be used below the insulation.