Residential Attic Loads

For other grades and species and for other loading conditions refer to the awc stjr.

Residential attic loads. Table r802 4 1 ceiling joist spans for common lumber species uninhabitable attics without storage live load 10 psf l δ 240. Attics constructed to include storage space must be designed for 20 psf live load. In sleeping only areas a 30 psf live load is required. Storage space dead load of partitions 20 lbs.

Code for residential buildings that creates minimum regulations for one and two family dwellings of three stories or less. For example if building is 24 x 24 and has trusses and the load on the roof will be for 30 lb snow load and a ceiling with no storage will total out like this. Dead load of attic floor not floored 10 lbs. Minimum design loads for buildings and other structures location uniform load psf kn m2 apartments see residential access floor systems office use.

Dead load of attic floor when floored 20 lbs. Spans for ceiling joists shall be in accordance with tables r802 4 1 and r802 4 2. 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.

Other residential rooms 40 psf. Loads should be determined in accordance with this chapter. However if the attic is intended for storage the attic live load or some portion should also be considered for the design of. 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. 0 9d 1 0e effect or 0 9 when resisting the load when permanent. The load on an outside wall with clear span trusses is exactly half the load on each wall. 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.

Offices require 50 psf. Of floor area dead load on second floor 20 lbs.