Roof Joist Construction Details

End bearing in hanger supported by a beam.

Roof joist construction details.

I joist construction details. The construction of the flat roof is similar to that of the timber upper floor. End bearing with rim joist. End bearing with rim board.

In addition to floor and roof framing details this guide includes recommendations for cantilevers and placement of web holes. This will give additional stability to the roof structure. For additional stability you can also use steel joists that are built into one or both of the walls. The united states still uses imperial units of measurement and framing members are typically spaced sixteen or twenty four inches apart.

End bearing with blocking panels. I joists in floor and roof applications. Lay all tiles within 1 foot of hips ridges and abutting vertical surfaces in roofer s cement. Good installation begins with specification of the correct joist for the application.

Trada and approved document part a give guidance on sizes of joists for flat roofs relating to spans and loading. Lay 10 or 12 inch tiles with 1 inch head lap on the sides of dormers. Intermediate bearing with blocking panels. End bearing in hanger on a top plate.

Secure each tile with two large head roofing nails. Joists are placed on edge spaced at 400 600mm centres supported by external and internal load bearing walls. In the uk a concrete tiled roof would normally have rafters at 600 mm 24 in centers roof battens at 300 mm 12 in centers and ceiling joists at 400 mm 16 in centers.