Plywood Leveling Shims For Roof

3 8 plywood is pretty stable to absorb the ridges.

Plywood leveling shims for roof.

When using plywood to flatten the floor it s good practice to use a urethane adhesive to hold it in place. Install shingles according to manufacturer s guidelines. 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. 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. 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 combined width of the jig and 2x4 blank making sure not to cut off the first few inches off the shim. Measure the size of your room using a measuring tape.

You can fix this by adding shims onto the top rafters or chords to make a more level nailing base. Use a brush for application in smaller areas. The end of a plywood or osb sheet should align with the rafters center and this is called breaking on center. You can check this with a 6 to 10 foot piece of lumber or a long carpenter s level.

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

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. Thoroughly cover all areas with one coat of primer to enhance adhesion of the leveling compound to the plywood surface. In this video you ll see how you can do plywood subfloor leveling using the plywood sheets. 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. Apply a latex floor primer to the entire plywood surface using a paint roller. I was going to install a hardwood floor 5 8 thickness but ther. Mark the thick end of the 6 ft shim onto the thin end of the blank butt the ends together and scribe.

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.