Flat Timber Roof Detail

Vent stack inverted roof.

Flat timber roof detail.

The steels or rsj s rolled steel joists are often built into one or both walls to give added stability to the roof structure. A cavity closer should be provided to the top of the walls to prevent fire spread and to stop damp air entering the roof space. The construction of the flat roof is similar to that of the timber upper floor. A cold flat roof is one where the insulation is between or between and below the roof joists.

Refurbishing an existing timber joisted flat roof which has no insulation. Usually a flat roof is built with a slight slope to provide some drainage. Inner gutter warm roof. The insulation is below the deck but above the plasterboard.

The flat roof is an architectural device that is loved by designers for its ability to create simplistic linear forms. Flat roofs aren t actually flat but must slope to drain water. Flat roofs can be used to create box shapes cantilevered into daring overhangs or can be planted to create usable vegetated gardens. Joists are placed on edge spaced at 400 600mm centres supported by external and internal load bearing walls.

Sep 10 2020 explore son nguyen hoang s board roof detail followed by 144 people on pinterest. A roof which is approximately flat is called as a flat roof. Cold roof vent timber. The basic construction of a flat roof starts with roofing timber that is laid across two upright items usually two walls.

On a basic level flat roof construction comes in the form of roofing timbers or joists as they are more commonly known or steels that are laid across two uprights walls in most cases. 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. Normally a slope of inch per foot is used.

Where a new flat roof abuts an existing external wall the joists can be hung on metal joist hangers which are fixed to a horizontal timber plate wall bolted to the wall. Search flat roof details. Mounting parts snow guard. This is used for refurbishment e g.

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