Roof Joist Construction Details

Lay 10 or 12 inch tiles with 1 inch head lap on the sides of dormers.

Roof joist construction details.

This will give additional stability to the roof structure. End bearing in hanger supported by i joist s 44kb. I joists are used extensively in residential floor and roof framing. 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.

Because i joists are straight and true it s easier for builders to avoid crowning and maintain a level framing surface. Mono pitched roofs are also known by the names of skillion roofs shed roofs pent roof and lean to roof. I joist construction details. Intermediate bearing with blocking panels.

Refer to the details. End bearing in hanger supported by a beam. They are ideal for long spans including continuous spans over intermediate supports. Include roof pitch roof geometry slope length and climatic factors such as heavy snowfall or rainfall.

Two nails are used for widths up to 8 inches. In double coursing the under course is attached to wood sheathing with three nails or staples. Trada and approved document part a give guidance on sizes of joists for flat roofs relating to spans and loading. The basic construction of a flat roof starts with roofing timber that is laid across two upright items usually two walls.

In addition to floor and roof framing details this guide includes recommendations for cantilevers and placement of web holes. I joists in floor and roof applications. For additional stability you can also use steel joists that are built into one or both of the walls. End bearing in hanger on a top plate.

Double the tiles at eaves and project them 1 inch over the rear edge of gutters. End bearing with rim joist. End bearing with blocking panels. The construction of the flat roof is similar to that of the timber upper floor.

For wider shingles and shakes three nails are used. 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. Joist is a term used in construction for load bearing planks that run horizontally or nearly to horizontally to ground.

End bearing with rim board. While the gabled roof is always pitched in two directions the mono pitch always slants in a single direction. Secure each tile with two large head roofing nails. With single course applications nails are driven one inch above the butt line of the succeeding course.