How To Attach Roofing To Steel Trusses

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How to attach roofing to steel trusses.

Use galvanized nails to attach the insulation securely to each of the rafters. It is important to protect metal sheets from potentially corrosive situations and materials. If you are installing the trusses with hand then it is very much important use effective tools to join all members perfectly. Nail a piece of 2 by 4 lumber diagonally from the inside of the rafter to the edge of the top plate with one nail in each end to hold the truss plumb or level from top to bottom.

Fasten it to the first rafter then unroll it only as far as the next one before nailing it in place. Use clips based on the thickness of the plywood such as 5 8 or 3 4 inch. Additional caution must be. Toenail a truss into the top of the wall plate by nailing through the sides of the bottom chord at a 30 degree angle.

Position a level on the rafter of the truss and adjust the top of the truss in or out to center the bubble in the indicator. Install plywood clips also called h clips at 24 inch intervals onto the upper edge of the first run of plywood by hand. For this you can use metal gusset plates and attach these with the help of nails and glue. Unroll the insulation with the vapor barrier side down.

If installing over green or damp lumber a positive vapor barrier must be installed to separate the wood from the sheet. It should be stretched as tight as possible without being pulled so tightly that it gets damaged.