Plywood In Attic Over Insulation

If you lay plywood and it squishes and compacts your.

Plywood in attic over insulation.

Your plywood will be fine especially if you are paying attention to airtightness when you build your ceiling. 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. If necessary block around them with plywood or corrugated cardboard to prevent the insulation from piling up on the vent.

Before you lay your plywood onto the joists check to see if your insulation is couple of inches above the height of the joists. Wear long sleeves and pants since fiberglass insulation irritates. Leaving part at r 19 is fine the rest will still be beneficial. It s not a vapor barrier.

How to lay attic flooring on top of fiberglass insulation. Walk to one end of the attic by carefully stepping only on the wooden ceiling joists. That s clearly your plan if any moisture makes its way to the plywood the damp plywood will dry out on hot sunny days. Most attics are dry plywood is a smart vapor retarder with variable permeance.

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. But you know i would rather see you just sort of map out the area in the center of the attic that you re going to use for storage and fill up the rest with insulation because that s the way you re going to get the most energy efficiency. Technically you should pull the plywood but adding insulation above will actually keep the wood warmer and reduce the risk of condensation.