Attic Live Load

Ft dead load of roof of wood shingle construction 10 lbs.

Attic live load.

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. Strengthening attic joists for live loads by sistering if the attic joists are not adequate one way to strengthen the floor for live loads is to sister the old joists. The uniform design live load in unoccupied landscaped areas on roofs shall be 20 psf 0 958 kn m2. In sleeping only areas a 30 psf live load is required.

Offices require 50 psf. Sistering is the process of adding a new joist next to each existing joist. With an evenly distributed live load of 30 psf which the tables show the floor is able to support the total weight on the floor would be about 3 360 pounds. The weight of all landscaping materials shall be considered as dead load and shall be computed on the basis of saturation of the soil.

3the transverse wind load for stud design is based on a localized component and cladding wind pressure. Minimum live loads for garages having trucks or buses shall be as specified in table 1607 6 but shall not be less than 50 psf 2 40 kn m 2 unless other loads are specifically justified and approved by the commissioner. Joist span bridging girder load width half joist span live load on roof local requirements for wind and snow. Increasing the total weight on the floor to 4 480 pounds however results in a live load of 40 psf which is beyond the floor s load capacity.

Other residential rooms 40 psf. 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. D w provides an adequate and. An extensive rewrite of footnotes b and g though mostly editorial clarifi es the intent of provisions for determining when an uninhabitable attic must be designed for a minimum live load of 20 psf for limited storage.

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.