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Thanks for your note. The insulation should be helpful. However, if you can add insulation and also a small air gap either above or below the insulation, that should be even better -- it doesn't have to be a very big air gap ... just something to disrupt direct noise transfer from the roof surface through the insulation.
Joseph, I would encourage you to connect with metal roofing manufacturer about this question and see what they advise as it could impact their warranty coverage. Ultimately, you want to have secure fastening of the roof panels but, also, foam may compress under foot traffic and that can cause problems.
Which type of noise matters more? The acorn thump in the backyard and neighbors? Or inside the house?
Metal's going to be louder than shingles for outside noise, doubly so if it's installed with an air gap or battens below.
I would suggest buying a scrap of metal roofing from a installer or metal supplier, huck it up on the roof, and figure out what the noise will be.
Have a modest lake cottage on one of the New Hampshire lakes, and it is under two very large oak trees. The trees are huge and probably in excess of 100-years old.
The acorns rain down on the current asphalt shingle roof and land with a pronounced ping.
I am considering a raised seam metal roof, ideally with (ideally 2" of foam) insulation underneath as the current cottage roof has no insulation at all. I am not worried about minor denting from the acorns, but the noise!
There are other units quite close, and disturbing the neighbors would be a gating factor.
Can you offer any comments or perspectives on this noise concern?
Thanks - Joe
Thank you, Todd. The cottage roof is planking over rounded logs! No insulation at all. How much insulation could I add to the exterior, underneath the "new" metal roof sheeting: 1", 2"?
