Residential Attic Loads

In sleeping only areas a 30 psf live load is required.

Residential attic loads.

Of floor area dead load of partitions 20 lbs. 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. 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.

Loads should be determined in accordance with this chapter. For other grades and species and for other loading conditions refer to the awc stjr. 0 9d 1 0e effect or 0 9 when resisting the load when permanent. 0 9d 1 0w a load factor of 1 6 when adding to load 7.

Of floor area dead load on second floor 20 lbs. Minimum design loads for buildings and other structures location uniform load psf kn m2 apartments see residential access floor systems office use. 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. Spans for ceiling joists shall be in accordance with tables r802 4 1 and r802 4 2.

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. Code for residential buildings that creates minimum regulations for one and two family dwellings of three stories or less. It brings together all building plumbing mechanical fuel gas energy and electrical provisions for one and two family residences. Other residential rooms 40 psf.

Dead load of attic floor not floored 10 lbs. Table r802 4 1 ceiling joist spans for common lumber species uninhabitable attics without storage live load 10 psf l δ 240. Storage space dead load of partitions 20 lbs. 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. Dead load of attic floor when floored 20 lbs.