Roof Joist Construction Details

End bearing with rim board.

Roof joist construction details.

End bearing in hanger on a top plate. End bearing with blocking panels. End bearing with rim joist. Trada and approved document part a give guidance on sizes of joists for flat roofs relating to spans and loading.

Intermediate bearing with blocking panels. Good installation begins with specification of the correct joist for the application. Joists are placed on edge spaced at 400 600mm centres supported by external and internal load bearing walls. I joist construction details.

Secure each tile with two large head roofing nails. The construction of the flat roof is similar to that of the timber upper floor. Lay 10 or 12 inch tiles with 1 inch head lap on the sides of dormers. End bearing in hanger supported by a beam.

The united states still uses imperial units of measurement and framing members are typically spaced sixteen or twenty four inches apart. Lay all tiles within 1 foot of hips ridges and abutting vertical surfaces in roofer s cement. This will give additional 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.

I joists in floor and roof applications. Double the tiles at eaves and project them 1 inch over the rear edge of gutters. End bearing in hanger supported by i joist s 44kb.