Attic Dead Load

Most houses attics are built without flooring and are not designed to carry.

Attic dead load.

C determine the total load and proper load duration. However if the attic is intended for storage the attic live load or some portion should also be considered for the design of other elements in the load path. As a result the live load dead load and distribution of forces are different. 2attic loads may be included in the floor live load but a 10 psf attic load is typically used only to size ceiling joists adequately for access purposes.

Dead load of roof of wood shingle construction 10 lbs. A the top and bottom chord dead load. Psf ceiling load for a c ducts plumbing and wiring the attic space is considered uninhabitable but will be used for storage. Boxes trunks suitcases etc.

When used for storage only dead load of attic floor not floored 10 lbs. Live load on attic floor local requirements. To simplify you can place 20 pounds of dead load per square foot on your subfloor as long it s supported mid span. B the top chord live include snow load as a live load and bottom chord live load.

Unlike the trussed roof live load and dead load of the rafters and ceiling joists must be accounted for as separate systems. Your allowed weight and span for a 2 x8 x12 2btr hem fir based on the info you have provided is 20 psf of dead load and 30 psf of live load with minimum bearing length of 0 68. Live loads are people and animals and tangentially the things used by people. 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.

Unless expressly built so an attic s joists are meant for carrying the load of the ceiling below and related elements collectively known as the dead load. Dead load of attic floor when floored 20 lbs. Design live loads will vary based on a number of factors but at a minimum 10 psf live load for attics without storage 20 psf live load with limited storage and 30 psf for habitable attics served with fixed stairs international residential code 2009 older or local codes may be different.