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.

Plywood leveling shims for roof.

3 cover the shimmed subfloor. All that the builders need to do is utilize a series multiple pieces of wood shims when leveling the main beams in order to reduce the pressure on the shims. Jon this does happen and that s why i recommend using the 3 8 plywood over the shingles. Sheathing is supplied in 4 8 sheets and are designed to be installed onto rafters with 16 24 spacing.

The end of a plywood or osb sheet should align with the rafters center and this is called breaking on center. Measure the size of your room using a measuring tape. 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. You can check this with a 6 to 10 foot piece of lumber or a long carpenter s level.

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. Mark the thick end of the 6 ft shim onto the thin end of the blank butt the ends together and scribe. Apply a latex floor primer to the entire plywood surface using a paint roller. Usually they just use a single piece of 1 1 2 inch wide shim.

Cut sheets of 3 8 inch plywood to size with a circular saw to cover the entire floor. I was going to install a hardwood floor 5 8 thickness but ther. 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.

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. In this video you ll see how you can do plywood subfloor leveling using the plywood sheets. You can fix this by adding shims onto the top rafters or chords to make a more level nailing base. With a six foot shim in hand remove the 2x4 blank from the straight edge jig and set the jig aside.

The idea is to get it as supported as you possibly can and then use the 3 8 plywood to level everything out. 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. Glue and screw the plywood.

Install shingles according to manufacturer s guidelines.