Plywood Leveling Shims For Roof

Sheathing is supplied in 4 8 sheets and are designed to be installed onto rafters with 16 24 spacing.

Plywood leveling shims for roof.

Thoroughly cover all areas with one coat of primer to enhance adhesion of the leveling compound to the plywood surface. Measure the combined width of the jig and 2x4 blank making sure not to cut off the first few inches off the shim. A single sliver of 1 1 2 inch wide shim will naturally crush under the weight of nearly any beam in a wood floor system. Measure the size of your room using a measuring tape.

When using plywood to flatten the floor it s good practice to use a urethane adhesive to hold it in place. 3 8 plywood is pretty stable to absorb the ridges. Shim the subfloor with shingles and plywood to bring it level in the same way you would if the slope was parallel to the board direction. Step 6 screw the sheets of 3 8 inch thick plywood over the shingles using a drill and 2 to 2 1 2 inch subfloor screws to attach them to the entire floor.

Use a brush for application in smaller areas. 3 cover the shimmed subfloor. The idea is to get it as supported as you possibly can and then use the 3 8 plywood to level everything out. If the slope is greater than the thickness of three shingles then plywood should be used and you should step down with different thicknesses of plywood and shingles to even out the floor.

I was going to install a hardwood floor 5 8 thickness but ther. Allow the primer to dry thoroughly. You can check this with a 6 to 10 foot piece of lumber or a long carpenter s level. Glue and screw the plywood.

Jon this does happen and that s why i recommend using the 3 8 plywood over the shingles. You can fix this by adding shims onto the top rafters or chords to make a more level nailing base. Cut sheets of 3 8 inch plywood to size with a circular saw to cover the entire floor. Mark the thick end of the 6 ft shim onto the thin end of the blank butt the ends together and scribe.

Usually they just use a single piece of 1 1 2 inch wide shim. Apply a latex floor primer to the entire plywood surface using a paint roller. Install shingles according to manufacturer s guidelines. The end of a plywood or osb sheet should align with the rafters center and this is called breaking on center.

With a six foot shim in hand remove the 2x4 blank from the straight edge jig and set the jig aside.