Continuous ridge board or ridge beam and solid sawn rafters angle clip.
Roof ridge shear transfer.
Designing a metal building for wind and seismic forces includes calculating the shear forces a cting on the walls and designing a method for the transference of those forces to the vertical frame.
Our brackets provide allowable in plane shear resistance capacities of 1750 2475 lbs.
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.
Roof diaphragm to the shear walls.
Blocking along the perimeter of the roof diaphragm that has the ability to transfer loads into the side walls or shear walls.
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 ridge element acts to transfer the shear loads from the sheathing on one side of the roof to the other.
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.
Blocks with ventilation holes typically have wire mesh on one side to prevent animals from entering the attic space.
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.
Shear x brackets are designed to transfer in plane shear forces in roof diaphragms across the ridge.
In steeper roofs the ridge might actually begin to act like a chord member and help in resisting the bending forces.
Depending on bracket size framing method and roof pitch.
The brackets take the place of the connection between the roof sheathing and the continuous ridge board or ridge beam in blocked diaphragm applications.
This can easily be accomplished in a number of ways but it is often overlooked at the job site.
In addition this connection can be hard to observe once exterior sheathing or house wrap is in place.
Whichever the case applications of a ridge vent in these types of highly loaded roof systems would require special framing.
Shear x brackets are designed to transfer in plane shear forces at the ridge line of roof diaphragms why use shear x.
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.
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.
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.
In wood framed construction it is important to transfer lateral forces from the roof framing to the shear walls below.
