Garage Flat Roof Joist Construction

The major difference between the warm flat roof and the cold flat roof has to do with the air flow between the roofing timbers known as joists that help to hold up the roof.

Garage flat roof joist construction.

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. I joist wood beams shaped like the capital letter i add strength to the garage and roof top. A flat roof garage built with joists span the gap between two walls. Using timber wall plates.

Old asbestos roofs are often replaced with flat roofs. The starting point involves laying roofing joists across the two upright items which in most cases will be the walls of the structure. Maximum clear span of flat roof joists in metres for sc3 timber spacing between joists size of roof joist 400mm 450mm 600mm 47 x 97 1 84 1 81 1 74 47 x 120 2 43 2 39 2 27 47 x 145 3 08 3 02 2 87 47 x 170 3 75 3 67 3 42. Of course you don t need to live in a modern house to deal with a flat roof.

Flat roof with no permanent access and altitude not exceeding 100m 0 75 kn m udl 0 9 kn point load most areas exceeding 100m but not exceeding 200m excluding parts of scotland pennines north east england refer to bs 6399 3 1 kn m udl 0 9 kn point load. The advantages of a flat roof garage are its efficient use of urban space control of water flow to the drainage system and its inexpensive costs. In the warm flat roof construction there is insulation packed into every possible space where air can flow. As you may imagine there is a fair amount of weight involved here in terms of boards felt etc.

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. Ceilings and roofs excluding trussed rafter roofs for dwellings or ask your lbc surveyor for advice. What is the process of building a flat roof. By way of metal flat roof joist hangers.

So any timber joists that are used need to be strong enough to support this weight. 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. Sizes of joists needed for flat roof construction.