Roof Joist Construction Details

Intermediate bearing with blocking panels.

Roof joist construction details.

For additional stability you can also use steel joists that are built into one or both of the walls. End bearing with rim board. They are ideal for long spans including continuous spans over intermediate supports. Double the tiles at eaves and project them 1 inch over the rear edge of gutters.

I joists in floor and roof applications. This will give additional stability to the roof structure. End bearing in hanger supported by i joist s 44kb. Two nails are used for widths up to 8 inches.

End bearing with blocking panels. I joists are used extensively in residential floor and roof framing. Secure each tile with two large head roofing nails. For wider shingles and shakes three nails are used.

The construction of the flat roof is similar to that of the timber upper floor. Joist is a term used in construction for load bearing planks that run horizontally or nearly to horizontally to ground. With single course applications nails are driven one inch above the butt line of the succeeding course. Joists are placed on edge spaced at 400 600mm centres supported by external and internal load bearing walls.

Include roof pitch roof geometry slope length and climatic factors such as heavy snowfall or rainfall. Lay 10 or 12 inch tiles with 1 inch head lap on the sides of dormers. In addition to floor and roof framing details this guide includes recommendations for cantilevers and placement of web holes. Good installation begins with specification of the correct joist for the application.

They differ considerably from the conventional gabled roofs in shape and construction. Because i joists are straight and true it s easier for builders to avoid crowning and maintain a level framing surface. End bearing in hanger supported by a beam. Trada and approved document part a give guidance on sizes of joists for flat roofs relating to spans and loading.

Refer to the details. Mono pitched roofs are also known by the names of skillion roofs shed roofs pent roof and lean to roof. Lay all tiles within 1 foot of hips ridges and abutting vertical surfaces in roofer s cement. So the only reason these planks are called roofing joists is because they run horizontally or nearly horizontally to the ground.

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. End bearing in hanger on a top plate. I joist construction details. The basic construction of a flat roof starts with roofing timber that is laid across two upright items usually two walls.