Attic Dead Load

C determine the total load and proper load duration.

Attic dead load.

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. Your attic floor was probably built with dead loads in mind. Dead load of roof of wood shingle construction 10 lbs. Dead loads are things that do not move.

Most houses attics are built without flooring and are not designed to carry. A the top and bottom chord dead load. Live loads are people and animals and tangentially the things used by people. Dead load of attic floor when floored 20 lbs.

Unlike the trussed roof live load and dead load of the rafters and ceiling joists must be accounted for as separate systems. 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. 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. 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.

Live load on attic floor local requirements. 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. When used for storage only dead load of attic floor not floored 10 lbs. Boxes trunks suitcases etc.

B the top chord live include snow load as a live load and bottom chord live load. Psf ceiling load for a c ducts plumbing and wiring the attic space is considered uninhabitable but will be used for storage. As a result the live load dead load and distribution of forces are different.