It depends on what code you are designing in accordance with. ASCE 7 requires 100 psf, while IRC requires 40 psf. Structural members and connections shown in DCA 6 have been sized based primarily on a uniformly distributed floor live load of 40 psf and a dead load of 10 psf. If a deck is…
Knee braces should only be installed at corner posts. Interior posts should not have knee braces. Diagonal bracing can contribute to the stiffness of the deck and, therefore, cause additional lateral loads on the posts. Since center posts receive more vertical load than corner posts, additional lateral load can cause overstress. For this reason, DCA6…
The IRC allows for 1500 psf to be used unless local conditions are known otherwise. This FAQ is based on the presentation of BCD303 – Design for Code Acceptance No. 6 – Prescriptive Residential Deck Construction Guide. Also, see Page 12 of Part II: Design Values for Structural Members for background on the Wet Service Factor.
Proprietary products are permitted as approved by the local authority having jurisdiction. This FAQ is based on the presentation of BCD303 – Design for Code Acceptance No. 6 – Prescriptive Residential Deck Construction Guide. Also, see Page 12 of Part II: Design Values for Structural Members for background on the Wet Service Factor.
For this table, a uniform load on the joist never determines the allowable span of the overhang. Only deflection due to the point load or ¼ the length of the main span (whichever controls) limit the length of the overhang. Under a single point load, deflection at the overhang decreases as the main span decreases….
Yes. Any cantilever of the house floor structure over a bearing wall in which the house bandjoist or rimjoist does not have full bearing support would qualify as a cantilever per DCA6. In such cases, a non-ledger deck or engineering evaluation would be required. Where the house rimjoist has full bearing support of a wall…
Beginning with the 2015 International Residential Code, wood beams or girders supporting deck floor joists or gravity loads from other sources must have full bearing at supporting posts. At ends of wood beams or girders, a minimum of 1.5” of direct bearing on wood or 3.0” on concrete or masonry is required. Beams and girders are…
Wood members that are protected from direct moisture in building construction reach an equilibrium moisture content below 19%, which is considered dry service conditions. Design values assigned to lumber and engineered wood products in the AWC National Design Specification® for Wood Construction (ANSI/AWC NDS®) and the NDS Supplement are based on the assumption of dry service conditions. When wood…