Roof framing depends on the type of roof you want to build.
Frameing for roof loads.
It is important to list live load dead load and total load separately because live load is used to compute stiffness and total load is used to calculate strength.
Framers stick building a hip roof you can learn a great deal about roof framing by understanding the concepts of framing a gable or shed roof.
The dead load on a roof includes the framing sheathing and roofing.
Boca also allows you to reduce the snow load for roofs with slopes greater than 30 degrees presumably because snow will slide or blow off steeply pitched roofs.
Let s look at the sample table below which shows maximum rafter spans for a snow load of 31 3 pounds per square foot psf.
The dead load of a typical asphalt shingled wood framed roof is about 15 pounds per square foot.
Depending on your region you may need to design for a maximum snow load of anything between zero to 65 pounds per square foot or roughly 0 3 kpa.
The load increases with the use of heavier roofing material.
Detailed flat to pitched roof conversion costs.
For dead loads you are correct.
50 psf x 14ft 700 pounds per lineal foot.
All roof framing tables are organized by maximum snow load.
There are several roof types.
If you live in a region that gets winter snowfall contact your municipal building department to find out what maximum snow loads you need to design for.
15 psf x 14ft 210 pounds per lineal foot.
Consult local building codes for snow load capacity and reference the span tables for joists and rafters published by the american wood council awc as a general rule roofs that have a high human occupancy rate should be framed with rafters every 16 structures such as sheds or barns can be frames with rafters every 24.
Converting a flat roof to a pitched roof is essentially framing a new roof for an average of 6 to 9 per square foot.
Converting a flat roof to pitched.
A clay tiled roof may have a dead load.
910 pounds per lineal foot.
However if the attic is intended for storage the attic live load or some portion should also be considered for the design of.
The heavier the roof and the more snow weight it will need to support the closer together the load bearing rafters or trusses need to be.
The boca code recognizes this and allows you to use the horizontal projection of the roof when calculating snow loads.
