Timber Frame Flat Roof Construction Details

As you may imagine there is a fair amount of weight involved here in terms of boards felt etc.

Timber frame flat roof construction details. Thermal bridges occur at all junctions in the building as well as when penetrations of the thermal insulation envelope occur. 215mm aircrete solid wall λ 0 15 w mk render insulation λ 0 022 w mk pitched roof gable. Flat roof joist and decking 3 10. Having a manual for warm flat roof construction with details and a summary of rules to follow helps.

This article covers all manner of flat roofing venting methods and details on how to build a flat garage roof and how to frame a flat roof and also encompasses flat roofs roof decking roof coverings including flat roof felt how to prevent leaks at abutments timber flat roof construction details and parapets and common. The basic construction of a flat roof starts with roofing timber that is laid across two upright items usually two walls. Joists are placed on edge spaced at 400 600mm centres supported by external and internal load bearing walls. That will help you remember certain factors and details to build the best possible flat roof.

Sizes of joists needed for flat roof construction. So any timber joists that are used need to be strong enough to support this weight. Old asbestos roofs are often replaced with flat roofs. Intermediate floor joist parallel 4 3.

By way of metal flat roof joist hangers. Trada and approved document part a give guidance on sizes of joists for flat roofs relating to spans and loading. Accredited construction details quinn building products junction designs to combat thermal bridging thermal bridging is a much talked about but little understood phenomenon in building design. Parapet detail joists parallel details in section 4.

Dormer in perspective view 3 12. Solid external masonry wall. Roof panels 3 8 1 roof panel connections 3 9. Using timber wall plates.

Thermal bridges can account for 35 50 of overall fabric. Dormer in section 3 11.