Trada and approved document part a give guidance on sizes of joists for flat roofs relating to spans and loading.
Timber frame flat roof.
Joists are placed on edge spaced at 400 600mm centres supported by external and internal load bearing walls.
Very simple trusses work on a principle of thirds.
At mbc timber frame we offer passive roof systems which deliver a u value of 0 10w m2k.
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 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.
Call us for more details about passive roof.
For additional stability you can also use steel joists that are built into one or both of the walls.
This will give additional stability to the roof structure.
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As with the cut vaulted roof joists the mbc flat roof system utilise open metal web posi joists which sees parallel timber flanges that are plated together with a engineered steel web component.
3 05 timber frame pitched roof.
Depending on the design of the trusses you re making any number of bracing joints will be necessary.
Timber frame deck now has clear polycarbonate covering roof on the open end.
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