Roof Joist Construction Details

For additional stability you can also use steel joists that are built into one or both of the walls.

Roof joist construction details.

End bearing with rim joist. End bearing in hanger on a top plate. Lay all tiles within 1 foot of hips ridges and abutting vertical surfaces in roofer s cement. Refer to the details.

I joists are used extensively in residential floor and roof framing. Good installation begins with specification of the correct joist for the application. Double the tiles at eaves and project them 1 inch over the rear edge of gutters. This will give additional stability to the roof structure.

End bearing in hanger supported by a beam. They are ideal for long spans including continuous spans over intermediate supports. Because i joists are straight and true it s easier for builders to avoid crowning and maintain a level framing surface. Lay 10 or 12 inch tiles with 1 inch head lap on the sides of dormers.

Joist is a term used in construction for load bearing planks that run horizontally or nearly to horizontally to ground. For wider shingles and shakes three nails are used. With single course applications nails are driven one inch above the butt line of the succeeding course. In double coursing the under course is attached to wood sheathing with three nails or staples.

I joist construction details. Joists are placed on edge spaced at 400 600mm centres supported by external and internal load bearing walls. Mono pitched roofs are also known by the names of skillion roofs shed roofs pent roof and lean to roof. Two nails are used for widths up to 8 inches.

While the gabled roof is always pitched in two directions the mono pitch always slants in a single direction. The basic construction of a flat roof starts with roofing timber that is laid across two upright items usually two walls. Whenever possible begin trim installation at the downwind end of the roof farthest away from the source of prevailing winds to al low flashing laps to face away from wind driven rain. So the only reason these planks are called roofing joists is because they run horizontally or nearly horizontally to the ground.

The construction of the flat roof is similar to that of the timber upper floor. In addition to floor and roof framing details this guide includes recommendations for cantilevers and placement of web holes. End bearing in hanger supported by i joist s 44kb. I joists in floor and roof applications.

End bearing with blocking panels. End bearing with rim board. Secure each tile with two large head roofing nails. Trada and approved document part a give guidance on sizes of joists for flat roofs relating to spans and loading.