These are battens which are cut at an angle before being fixed on to the roof joists. Are flat roof extensions a cheaper way of adding space? Flat roof extensions are usually considered one of the ...

They’re a variation on common roof trusses — the wood structures at ... This bridge is designed just like a floor truss, with a flat top and bottom chord and lots of triangles in between.

John Salka explains construction, access and other issues associated with flat-roof operations ... Once it is determined that the roof is constructed of wooden joists and is not heavily involved ...

Flat roofs shouldn’t really be flat anyway. Even though joists go in level, firring pieces are used to give it a small fall, (about 1:60 or 1 degree), and direct water to an outlet or gutter.