There must be a slope of 1 80.

Timber flat roof construction details. Ventilated rafter void gable 3 04 timber frame pitched roof. There are two basic components of a timber roof. Ventilated batten void warm roof eaves. A qualified roofing contractor will be able to advise on this but here are some of the main guidelines.

Modern timber roofs are mostly framed with pairs of common rafters or prefabricated wooden trusses fastened together with truss connector plates timber framed and historic buildings may be framed with principal rafters or timber roof trusses roofs are also designated as warm or cold roof depending on how they are designed and built with regard to thermal building insulation and ventilation. Roof panels 3 8 1 roof panel connections 3 9. The construction of the flat roof is similar to that of the timber upper floor. But this type of roof is seldom as attractive as the pitched form as it can result in a blocky stunted appearance.

Part h of the building regulations regarding drainage state that water should drain to one or two edges. When installing or repairing a flat roof you must adhere to building regulations. Joists are placed on edge spaced at 400 600mm centres supported by external and internal load bearing walls. Trada and approved document part a give guidance on sizes of joists for flat roofs relating to spans and loading.

The basic construction of a flat roof starts with roofing timber that is laid across two upright items usually two walls. The supporting structure and the covering. It is the most common and least expensive method of roof construction for houses with a simple pitched roof with a flat ceiling and is a great place to run wires for lights and service pipes to bathrooms and kitchen areas however it is not possible to have a loft with roof truss construction. Parapet detail joists parallel details in section 4.

Detail description 3 00 timber frame isometric cut away view 3 01 timber frame pitched roof. Flat skillion and vaulted roofs. Cut to length and. The steels or rsj s rolled steel joists are often built into one or both walls to give added stability to the roof structure.

Parapet detail joists perpendicular 3 13. Flat roof joist and decking 3 10. Ventilated roofspace gable 3 03 timber frame pitched roof. For additional stability you can also use steel joists that are built into one or both of the walls.

Finishes for flat roofs are also more limited. Modern skillion roof photo by bill bradley flat or skillion roofs tend to be stick built i e. Flat roofs became popular amongst early 1900s modernist architects because they removed the often complicated pitched roofs of traditional construction and replaced them with perfect straight lines. Dormer in perspective view 3 12.

These lines gleamed against the sky in the same way as other products of industrialisation such as trains and ocean liners and so represented a new way of creating buildings. Ventilated roofspace eaves 3 02 timber frame pitched roof. Having a manual for warm flat roof construction with details and a summary of rules to follow helps. For a loft a conventional roof could be used.

• Tile Installers Virginia Beach