Putting Plywood Over Attic Insulation

The plywood should be perpendicular to the joists so that a signal sheet spans multiple.

Putting plywood over attic insulation.

Carry a piece of plywood to one of the far corners of the attic and lay it on top of the installed boards. Now that you ve inspected your attic s current insulation and determined how much it has you. Maneuvering heavy 4 x 8 sheets of plywood or osb oriented strand board up to an unfinished attic is sometimes like trying to fit a square peg into a round hole. So you can put 8 inches of insulation down then put the plywood over that.

Laying foil over on top of insulation on the attic floor. You put the insulation down first and let s say you have 2x8s for your floor joists in the attic. This method can be used in any climate though it historically has been most popular in colder climates. To give yourself enough space to ensure adequate insulation under the.

That s clearly your plan if any moisture makes its way to the plywood the damp plywood will dry out on hot sunny days. To make the job easier use a circular saw to cut the plywood sheet first into 2 2 8 strips which will be much easier to handle. Your plywood will be fine especially if you are paying attention to airtightness when you build your ceiling. Most attics are dry plywood is a smart vapor retarder with variable permeance.

It s not a vapor barrier. Now in your particular part of the country you re going to want a lot more insulation than that.