Timber Frame Flat Roof Construction Details

Boardsmust have a nominal thickness of min.

Timber frame flat roof construction details. Joists are placed on edge spaced at 400 600mm centres supported by external and internal load bearing walls. The roof sheathing consisted of inch thick wide pine boards nailed to the purlins and thick enough to resist much sagging. 44 0 1483 770863 e mail. Timber frame standard details september 09 building 1 grosvenor court hipley street old woking surrey tel.

The original roof was built using purlins beams extending between gable ends. 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 framing in our time power tools have made the components for the timber frame easier to refine but the methods for joining and principles of construction are largely unchanged from the 1600 s here a timberwright lays out a knee brace to be inserted in a mortise cut in the column and beam to give the bent additional lateral stability. Trada and approved document part a give guidance on sizes of joists for flat roofs relating to spans and loading.

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. 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. Thermal bridges can account for 35 50 of overall fabric.

This will give additional stability to the roof structure. 24 mm 20 and should have. 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.

44 0 1483 769518 fax. 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. On a basic level flat roof construction comes in the form of roofing timbers or joists as they are more commonly known or steels that are laid across two uprights walls in most cases. The construction of the flat roof is similar to that of the timber upper floor.

Very simple trusses work on a principle of thirds. For additional stability you can also use steel joists that are built into one or both of the walls.