Roof Ridge Shear Transfer

At a ridge you re transferring that same shear across a joint between framing members that likely has questionable weak axis moment shear transfer capacity truss plate.

Roof ridge shear transfer.

Roof diaphragm to the shear walls. The ridge element acts to transfer the shear loads from the sheathing on one side of the roof to the other. Continuous ridge board or ridge beam and solid sawn rafters angle clip. In addition this connection can be hard to observe once exterior sheathing or house wrap is in place.

Blocks with ventilation holes typically have wire mesh on one side to prevent animals from entering the attic space. Blocking along the perimeter of the roof diaphragm that has the ability to transfer loads into the side walls or shear walls. The shear transfer capacity of this kind of blocking is less than that of full height blocking but it provides room for insulation ducts etc. The block is installed between roof truss heels at the top of the exterior wall to carry and transfer lateral forces from the roof diaphragm to the braced wall.

Shear x brackets are designed to transfer in plane shear forces in roof diaphragms across the ridge. From what i ve seen there is a lack of testing on pitched diaphragms in general for both plywood and steel deck. The base and ridge bender is a combination tool used for bending stone coated steel to control water from blowing into the metal roof system. The swenson shear stone coat cutter is designed for use on a multitude of metal roof applications from stone coated metal shake and shingles to 14 gauge stainless flat sheets.

In steeper roofs the ridge might actually begin to act like a chord member and help in resisting the bending forces. The roof of a structure contains a component called a roof diaphragm that acts as the transfer vehicle for the forces of the wind and seismic movement against the outer walls. The brackets allow the use of continuous ridge venting in blocked diaphragms by replacing the boundary nailing between the roof sheathing and the ridge board ridge beam that is lost due to the gap required for venting. This can easily be accomplished in a number of ways but it is often overlooked at the job site.

Shear x brackets are designed to transfer in plane shear forces at the ridge line of roof diaphragms why use shear x. Our brackets provide allowable in plane shear resistance capacities of 1750 2475 lbs. The rafter force is transferred through an angle clip to the ridge board or beam and again transferred through an angle clip to the rafter. The brackets take the place of the connection between the roof sheathing and the continuous ridge board or ridge beam in blocked diaphragm applications.

An asd shear force equal to the unit shear times the rafter member spacing is assumed to be in the rafter due to sheathing nailing. In wood framed construction it is important to transfer lateral forces from the roof framing to the shear walls below.