Plywood In Attic Over Insulation

It s not a vapor barrier.

Plywood in attic over insulation.

Put on work gloves safety glasses and a dust mask before entering the attic. Wear long sleeves and pants since fiberglass insulation irritates. If you lay plywood and it squishes and compacts your. 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. 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. 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. Before you lay your plywood onto the joists check to see if your insulation is couple of inches above the height of the 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. Leaving part at r 19 is fine the rest will still be beneficial. 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. Make sure you don t block the air flow from the soffits.

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. If necessary block around them with plywood or corrugated cardboard to prevent the insulation from piling up on the vent.