Residential Attic Loads

Minimum design loads for buildings and other structures location uniform load psf kn m2 apartments see residential access floor systems office use.

Residential attic loads.

The minimum live loads provided in table r301 4 are the minimum loads which must be applied in the design of each of the elements listed. Other uses for attics and lofts include a live load plus a 10 psf dead load for the weight of the floor support system floor sheathing sheetrock on the underside and any insulation. Storage space dead load of partitions 20 lbs. Spans for ceiling joists shall be in accordance with tables r802 4 1 and r802 4 2.

Loads should be determined in accordance with this chapter. Of floor area dead load on second floor 20 lbs. In sleeping only areas a 30 psf live load is required. Code for residential buildings that creates minimum regulations for one and two family dwellings of three stories or less.

0 9d 1 0w a load factor of 1 6 when adding to load 7. It brings together all building plumbing mechanical fuel gas energy and electrical provisions for one and two family residences. Dead load of attic floor not floored 10 lbs. 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.

However if the attic is intended for storage the attic live load or some portion should also be considered for the design of. 0 9d 1 0e effect or 0 9 when resisting the load when permanent. Attics constructed to include storage space must be designed for 20 psf live load. Of floor area dead load of partitions 20 lbs.

Offices require 50 psf. Table r802 4 1 ceiling joist spans for common lumber species uninhabitable attics without storage live load 10 psf l δ 240. Other residential rooms 40 psf. For other grades and species and for other loading conditions refer to the awc stjr.

Buildings with combustible ceiling or roof construction shall have an attic access opening to attic areas that have a vertical height of 30 inches 762 mm or greater over an area of not less than 30 square feet 2 8 m 2 the vertical height shall be measured from the top of the ceiling framing members to the underside of the roof framing members. Minimum uniformly distributed live loads adapted from sei asce 7 10.