Putting Plywood Over Attic Insulation

This is probably the easiest method to install radiant barrier atticfoil is to lay the foil out over the existing insulation on the attic floor.

Putting plywood over attic insulation.

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. Your plywood will be fine especially if you are paying attention to airtightness when you build your ceiling. Laying foil over on top of insulation on the attic floor. Most attics are dry plywood is a smart vapor retarder with variable permeance.

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. The plywood should be perpendicular to the joists so that a signal sheet spans multiple. You put the insulation down first and let s say you have 2x8s for your floor joists in the attic. So you can put 8 inches of insulation down then put the plywood over that.

Now that you ve inspected your attic s current insulation and determined how much it has you. Now in your particular part of the country you re going to want a lot more insulation than that. To give yourself enough space to ensure adequate insulation under the. This method can be used in any climate though it historically has been most popular in colder climates.

That s clearly your plan if any moisture makes its way to the plywood the damp plywood will dry out on hot sunny days. Ensuring adequate insulation under the flooring.