Plywood In Attic Over Insulation

Walk to one end of the attic by carefully stepping only on the wooden ceiling joists.

Plywood in attic over insulation.

Your plywood will be fine especially if you are paying attention to airtightness when you build your ceiling. Make sure you don t block the air flow from the soffits. Before you lay your plywood onto the joists check to see if your insulation is couple of inches above the height of the joists. If necessary block around them with plywood or corrugated cardboard to prevent the insulation from piling up on the vent.

Most attics are dry plywood is a smart vapor retarder with variable permeance. Wear long sleeves and pants since fiberglass insulation irritates. How to lay attic flooring on top of fiberglass insulation. Ensuring adequate insulation under the flooring to give yourself enough space to ensure adequate insulation under the flooring construct a riser of 2 x 4 s in the attic over the existing joists.

Leaving part at r 19 is fine the rest will still be beneficial. Put on work gloves safety glasses and a dust mask before entering the attic. Technically you should pull the plywood but adding insulation above will actually keep the wood warmer and reduce the risk of condensation. What you could do is you could put insulation down in the floor joist first then plywood over it and then you could add another layer of unfaced on top of that.

If you can do it there really are no down sides except 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. In most houses getting a 4 by 8 sheet of plywood into the attic is nearly impossible without cutting a bigger hole in the ceiling.