Showing results 1 - 12 of 12
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Incorrectly done seismic retrofit, the plywood sheathing is not nailed to the mud sill and therefore it is not providing any shear strength
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Right – Retrofit Specification for installing roof sheathing an 18-inch gable end overhang
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Step 1. Remove the existing wall cladding to prepare to retrofit an exterior wall.
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Step 2. Install a continuous air and water control layer over the existing wall sheathing.
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Step 4. Install insulating sheathing and vertical furring strips on the retrofitted exterior wall; seal around pipe or duct with urethane sealant.
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Step 5. Install sheathing tape flashing over the duct or pipe and wood blocking on either side for later attachment of trim.
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Step 6. Install vent hood trim block, metal cap flashing; seal top edge of flashing with sheathing tape.
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The flush cut method for seismic retrofit bracing of a cripple wall allows the plywood sheathing to be attached directly to both the cripple studs and the notched section of the mudsill
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The reverse block method for seismic retrofit bracing of a cripple wall uses a 2x4 attached to the sill plate to provide a means to attach the plywood cripple wall sheathing to the sill plate
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With the nailed block method, wood blocks are attached to the sill plate and the cripple wall plywood is attached to the block to provide shear strength for correctly bracing a cripple wall in a seismic retrofit