Ijoist Single Slope Roof

Single roof is defined as a roof having only a single slope on each side of a central ridge whereas in shed roof it has a single slope but without a central ridge.

Ijoist single slope roof.

The deep joists were overkill for the building s roof span obviously. Conventional framing the first thing to understand is how a roof framed with wood i joists differs structurally from a traditional stick framed roof. The main factors which influence the shape of roofs are the climate and the materials available for roof structure and the outer covering. In a typical roof framed with dimension lumber the rafters rest on the exterior wall top plate at the lower end and bear against a ridge board at the top.

The single roof is a type of sloping roof. The greater the roof s pitch the better it will shed snow ice and rain. Everything buckles a little in the heat and deforms eventually. If you slope the joists you will slope the roof but besides the trivia i agree with steven and rusty about fragility of insulation sloped roof.

Don t go with soft solution on the roof. The minimum roof pitch is 1 8 inch rise per foot of span. Roof shapes differ greatly from region to region. If you are totally sold upon single slope you could use a monopitch truss with a raised heel on the low side to keep from having the one wall so tall or you could use a parallel chord truss set at an angle.

Watch for the bird baths. If you have a roof slope of less than 3 12 the warranty on the paint of the roof steel will be void. A little misleading title. But we did have to scratch our heads a little to figure out the framing details for the two pitch roof system.

Slope the joists of your choice. Usages vary slightly from region to region or from one builder or architect to another. Roof terminology is also not rigidly defined. Asphalt or composite shingles need at least a 2 12 pitch steel roofing needs a 3 12 pitch or higher and rolled roofing needs a 2 12 pitch or more.

1 4 to a foot okay but more the better. Where the 2 5 12 pitch i joists sit on top of the 12 12 pitch existing roof you can nail down a ledger from 2 2x s so that you have full bearing. If you put web stiffeners in i m sure that would be alright but just ask the architect for that detail because like i said before hes has to give it to you. Visit the roof framing page for more information on cutting roof rafters and visit the roof pitch calculator for determining rafter lengths based on rise and run.

Rafter span tables use these tables to determine lengths sizes and spacing of rafters based on a variety of factors such as species load grade spacing and pitch. In this type of roofs common rafters are provided on each slope without any intermediate support.