Construction Warm Flat Roof Fascia Detail

Trada and approved document part a give guidance on sizes of joists for flat roofs relating to spans and loading.

Construction warm flat roof fascia detail.

Having a manual for warm flat roof construction with details and a summary of rules to follow helps. Front fascia flat roof detail. A warm flat roof is formed by placing a layer of insulation over the top of the roof structure. The insulation is placed below the waterproof covering and is either mechanically fixed or bitumen bonded on to the top of the deck.

Joists are placed on edge spaced at 400 600mm centres supported by external and internal load bearing walls. 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. Construction studies drawing detail showing how to draw a flat roof warm deck construction detail to a scale of 1 10 with a short introduction highlighting t.

Steve from london flat roofing explains how warm flat roof construction works in this excellent short video. Inverted warm deck roof the insulation boards in an inverted warm deck are laid over the structural deck and the waterproof covering. Of course you don t need to live in a modern house to deal with a flat roof. Whatever new flat roof covering you choose epdm rubber kemper liquid rubber triflex mariseal etc.

The construction of the flat roof is similar to that of the timber upper floor. From there the flat roof system you choose will determine the materials you apply. 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. Yet for historic modern style buildings like this old house s cambridge tv project flat roofs are at the core of the architecture meant to reflect the broad horizontal lines of the natural landscape.

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

A waterproof exterior layer is essential and there are a number of options including bitumen based felt or asphalt epdm rubber and pvc based systems as well as cold applied liquid systems bitumen coverings.