Plywood Roof Diaphragm Design

For wood structures diaphragms are commonly constructed of wood structural panel wsp sheathing or decking applied to the upper face of regularly spaced floor or roof wood framing members such as.

Plywood roof diaphragm design.

Diaphragms and shear walls form l350. The ibc doesn t recognize 2x tongue and groove decking we have 2x6 s as providing roof diaphragm shear behavior. The building is located in a residential neighborhood a few miles north of downtown seattle. Table 3 16a1 roof diaphragm limits for wind.

Design and construction recommendations for engineered diaphragm systems in floor shear wall and roof systems. Panel orientation is assumed as load case 1 for load in the n s direction and load case 3 for the e w direction. A rectangular uninterrupted plane a diaphragm behaves primarily as if it were a short deep beam figure 1. Design the diaphragm for a roof system consisting of light frame wood trusses spaced at 24 inches o c without block ing.

1 applicable to all roof slopes with and without roof irregularities exposure b all slopes. Diaphragms are a roof floor or other system transferring lateral forces applied to a building to the vertical elements such as the shear walls. Figure 11 1 1 shows a typical floor plan and figure 11 1 2 shows a longitudinal section and elevation. Min max min max min max min max min max min max min max min max min max min max min max min max min max min max.

Structures using wood frame shear walls or wood frame diaphragms to resist wind seismic or other lateral loads shall be designed and constructed in accordance with af pa sdpws and the applicable provisions of sections 2305 2306 and 2307. My questions however are this. I ve heard in the past that placing structural i plywood or osb over the top of the decking can provide the necessary diaphragm action. Whilst the information in this guide was accurate at the time of publication it is the users responsibility to.

In its most basic form i e. Steel deck plywood and concrete are all common materials utilized in diaphragm applications. In building design these loads are typically caused by wind and seismic events although earth and water can exert lateral forces as well. 2018 disclaimer the advice provided in this publication is general in nature and is intended as a guide only.

Foundation wall and strip footing system.