Live Load Wood Lattice Roof

Minimum design loads for buildings and other structures location uniform load psf.

Live load wood lattice roof.

For any particular load the allowable span of patio cover joists and beams depends on wood species and board size. Electrical tower you could expect maintenance live load of 300 lb on the horizontal elemental. Minimum uniformly distributed live loads adapted from sei asce 7 10. The roof shall be designed for the live load indicated in table r301 6 or the snow load indicated.

In the end i think this all boils down to good rationale ca notes and your local building code. Since it is possible to use the attic for storage the live load of the attic floor is set at 20 psf according to code. 0 9d 1 0w a load factor of 1 6 when adding to load 7. 1 2d 1 0e l 0 2s when h loads are present they shall have 6.

What happens if you put 20 psf or 300 on the joists only not the purlins. When you refer to a beam s allowable span what you re really describing is the allowable spacing between posts. Ground snow load might seem somewhat confusing until you read the basic premise that is identified in irc section r301 6 which states. Unlike the trussed roof live load and dead load of the rafters and ceiling joists must be accounted for as separate systems.

This issue of live load vs. On a roof with a slope greater than 4 to 12 the live load limit is typically adjusted downward from 20 psf to 15 psf to allow for the relatively greater dead load on the steeper roof. Victor staley a building official in the town of brewster mass responds. As a result the live load dead load and distribution of forces are different.