Loose Radiant
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Loose Radiant
plywood over attic insulation?
I need to replace my current attic insulation (it has compacted over many years) with something that works better. From my research, a loose fill 12" or so should do the trick. I also am considering putting up a radiant barrier along the inside of the roof. Is there any danger of putting plywood boards over the new insulation or could it actually help with heating/cooling costs?
I understand that the electrical wiring ceiling wiring will be covered so if there is ever a problem the boards would have to come up.
Any other pros and cons?
Thanks.
That is part of my concern. I've calculated that I need about 12"-14" of insulation to get the ideal R. Placing plywood boards over it will compact the insulation, probably decreasing the R value. However, does adding the plywood make up for that lost R? I don't know.
Loose fill insulation may not be your choice if you plan on putting down plywood. Since the plywood would require you to compact the air space out of the loose fill, eliminating it's effectiveness. You might look at alternate insulating products, including foam board.
Installing a radiant barrier is a good idea. But this would need to be placed on the roof deck, not the top of the joist framing where the insulation is usually placed. It's usually difficult to impossible to place this from the attic side. The only other practical method to do it would be to wait until you need to replace the shingles, and add radiant barrier roof deck to that job.
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