Plywood Leveling Shims For Roof

You can check this with a 6 to 10 foot piece of lumber or a long carpenter s level.

Plywood leveling shims for roof.

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. Sheathing is supplied in 4 8 sheets and are designed to be installed onto rafters with 16 24 spacing. 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. With a six foot shim in hand remove the 2x4 blank from the straight edge jig and set the jig aside. In this video you ll see how you can do plywood subfloor leveling using the plywood sheets. Measure the combined width of the jig and 2x4 blank making sure not to cut off the first few inches off the shim.

Thoroughly cover all areas with one coat of primer to enhance adhesion of the leveling compound to the plywood surface. The idea is to get it as supported as you possibly can and then use the 3 8 plywood to level everything out. 3 cover the shimmed subfloor. Allow the primer to dry thoroughly.

Start with a level nailing surface whether you re using plywood or oriented strand board osb the first step in building a high quality roof is to make sure you have a level nailing surface. Measure the size of your room using a measuring tape. The end of a plywood or osb sheet should align with the rafters center and this is called breaking on center. 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.

When using plywood to flatten the floor it s good practice to use a urethane adhesive to hold it in place. Glue and screw the plywood. Use a brush for application in smaller areas. Mark the thick end of the 6 ft shim onto the thin end of the blank butt the ends together and scribe.

Cut sheets of 3 8 inch plywood to size with a circular saw to cover the entire floor. 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. 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. 3 8 plywood is pretty stable to absorb the ridges.

Install shingles according to manufacturer s guidelines.