Roof Truss Load Path

15 psf x 14ft 210 pounds per lineal foot.

Roof truss load path.

A when access is provided 1500 n m 2 b when access is not provided 750 n m 2 except for maintenance ii sloping roof with slope greater than 10 degrees. All other forces will vary in magnitude duration and location. 50 psf x 14ft 700 pounds per lineal foot. The roof rafters transfer the loads to the ceiling joists and to the bearing walls that support the trusses.

Vertical load path in traditional sloped roof framing loads are transmitted vertically downward through the roof framing to the exterior walls that transmit the load downward to the home s. Design loads the building dead load is the only known load. The building is designed for design load possibilities that may never occur. Per ansi tpi 1 2014 section 7 5 2 1 figure 4 all loads being applied from roof trusses to wall and wall to ribbon board are considered to be applied as uniform plf loads.

The sheathing transfers the loads to the roof rafters. All roof and wall loads are assumed to be uniform with no concentrated loads on the trusses or walls present. This allows wind uplift forces on the roof to be safely distributed through the walls to the foundation. Truss spanning between bearing walls.

The live load shall be taken as follows. To transfer loads from the wall above to the truss ends where they can be transferred to the wall below. The irc does not provide specific guidance as to when blocking may be required to transfer the loads directly. R roof live load w wind load s snow load e earthquake load r rain load.

Roof truss span tables alpine engineered products 15. The truss could be designed based on the assumption that the 25 psf roof snow load is a factored ground snow load in which case a ground snow load is back calculated using asce 7 based on the specified roof snow load pg 25 psf therein lies the problem with specifying only a roof snow load. If one part of the load path fails or is discontinuous building failure may occur. Load path loads on the roof are initially supported by the sheathing.

910 pounds per lineal foot. I for sloping or flat roof with slopes up to and including 10 degrees. Live loads on roof trusses.