Attic Dead Load

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.

Attic dead load.

Your attic floor was probably built with dead loads in mind. The ceiling load may include items like drywall ducts recessed lights bathroom fans and attic insulation. Live loads are people and animals and tangentially the things used by people. Psf ceiling load for a c ducts plumbing and wiring the attic space is considered uninhabitable but will be used for storage.

Unlike the trussed roof live load and dead load of the rafters and ceiling joists must be accounted for as separate systems. Dead loads are things that do not move. As a result the live load dead load and distribution of forces are different. Most houses attics are built without flooring and are not designed to carry.

Dead load of attic floor when floored 20 lbs. 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. 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. Dead load of roof of wood shingle construction 10 lbs.

When used for storage only dead load of attic floor not floored 10 lbs. To simplify you can place 20 pounds of dead load per square foot on your subfloor as long it s supported mid span. 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. Live load on attic floor local requirements.

Boxes trunks suitcases etc. 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. C determine the total load and proper load duration.