Timber Frame Flat Roof Construction Details

Thermal bridges can account for 35 50 of overall fabric.

Timber frame flat roof construction details.

Below is a sketch of the original roof wall structural details for this building. Thermal bridges occur at all junctions in the building as well as when penetrations of the thermal insulation envelope occur. Very simple trusses work on a principle of thirds. The construction of the flat roof is similar to that of the timber upper floor.

This will give additional stability to the roof structure. The original roof was built using purlins beams extending between gable ends. 44 0 1483 770863 e mail. 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.

Timber frame standard details september 09 building 1 grosvenor court hipley street old woking surrey tel. Boardsmust have a nominal thickness of min. 24 mm 20 and should have. The steels or rsj s rolled steel joists are often built into one or both walls to give added stability to the roof structure.

The basic construction of a flat roof starts with roofing timber that is laid across two upright items usually two walls. A super basic a frame roof will require anywhere between 4 and 8 depending on the size of the rafters with plumb cuts necessary for each angle in the brace. Ventilated batten void warm roof gable 3 06 timber frame timber flat roof 3 07 timber frame timber flat roof with parapet 3 08 timber frame lintel at window head 3 09 timber frame windows and doors jambs and cills specification within an example should 3 10 timber frame ground. For additional stability you can also use steel joists that are built into one or both of the walls.

Timber in the form of rough sawn or planedboards or planks can be used as the loadbearing deck to a flat roof fig. Trada and approved document part a give guidance on sizes of joists for flat roofs relating to spans and loading. Joists are placed on edge spaced at 400 600mm centres supported by external and internal load bearing walls. 3 05 timber frame pitched roof.

The roof sheathing consisted of inch thick wide pine boards nailed to the purlins and thick enough to resist much sagging. Depending on the design of the trusses you re making any number of bracing joints will be necessary.