Joists are placed on edge spaced at 400 600mm centres supported by external and internal load bearing walls.

Timber flat roof construction details uk. A flat roof is generally defined as having a pitch not greater than 15 to the horizontal. A timber decking is then constructed and its weight supported by the joists. Flat roof joists spanning the shorter length of the roof form the load bearing members of the structure. The joists are attached to load bearing walls by two common methods.

A roof is defined in bs 6229 as a flat roof if it has a pitch of 10 degrees or less. While many will contact a professional installation company to complete the job there are others who will feel confident enough in their own ability to install a flat roof onto the structure. A flat roof must be strong durable and stable throughout its lifetime. There are two basic components of a timber roof.

For homebuilders a timber frame for a flat roof is usually the cheapest option and the easiest to build. The basic construction of a flat roof starts with roofing timber that is laid across two upright items usually two walls. The steels or rsj s rolled steel joists are often built into one or both walls to give added stability to the roof structure. Having a manual for warm flat roof construction with details and a summary of rules to follow helps.

A truly flat roof would not allow rainwater to drain away so most flat roofs have a fall on them so that the rainwater naturally flows to collection points. The construction of the flat roof is similar to that of the timber upper floor. Whilst you can have tiled roofs of 10 15 these are really flat roof construction with a cosmetic covering of tiles. For additional stability you can also use steel joists that are built into one or both of the walls.

Wherever possible joists should span the shortest distance of the roof plan. Finishes for flat roofs are also more limited. The roofs have a timber frame as the supporting structure. As with the construction of any type of roofing system it s crucial to understand the correct process and essential criteria involved in flat roofing construction.

The pitch is governed by the roof covering and the required rate of rainwater discharge. Trada and approved document part a give guidance on sizes of joists for flat roofs relating to spans and loading. It must provide adequate protection against the elements keeping the buildings structure and interior dry. But this type of roof is seldom as attractive as the pitched form as it can result in a blocky stunted appearance.

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