Roof Joist Construction Details

Double the tiles at eaves and project them 1 inch over the rear edge of gutters.

Roof joist construction details.

Joists are placed on edge spaced at 400 600mm centres supported by external and internal load bearing walls. The construction of the flat roof is similar to that of the timber upper floor. End bearing with rim board. Refer to the details.

Mono pitched roofs are also known by the names of skillion roofs shed roofs pent roof and lean to roof. End bearing with rim joist. I joists are used extensively in residential floor and roof framing. 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. Lay all tiles within 1 foot of hips ridges and abutting vertical surfaces in roofer s cement. Secure each tile with two large head roofing nails. So the only reason these planks are called roofing joists is because they run horizontally or nearly horizontally to the ground.

For wider shingles and shakes three nails are used. Include roof pitch roof geometry slope length and climatic factors such as heavy snowfall or rainfall. Joist is a term used in construction for load bearing planks that run horizontally or nearly to horizontally to ground. End bearing in hanger supported by a beam.

They are ideal for long spans including continuous spans over intermediate supports. With single course applications nails are driven one inch above the butt line of the succeeding course. Good installation begins with specification of the correct joist for the application. End bearing with blocking panels.

While the gabled roof is always pitched in two directions the mono pitch always slants in a single direction. End bearing in hanger supported by i joist s 44kb. They differ considerably from the conventional gabled roofs in shape and construction. The basic construction of a flat roof starts with roofing timber that is laid across two upright items usually two walls.

Two nails are used for widths up to 8 inches. I joists in floor and roof applications. Because i joists are straight and true it s easier for builders to avoid crowning and maintain a level framing surface. 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.

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. In double coursing the under course is attached to wood sheathing with three nails or staples. Intermediate bearing with blocking panels.