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Old 11-12-2013
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Re: Best way to soundproof engine compartment?

I lined the engine compartment hatch with 1" foil faced fiber-glass duct board. Creative use of *real* aluminum foil duct tape sealed the edges and reinforces the mastic which fastens it to the 1/4" ply.It works so well that I intend to apply it to the entire compartment....some day . The compartments bulkheads are plywood; so a few screws with fender washers to keep it in place till the mastic sets is all it will take. Then a contortionists game applying tape to the joints/seams.....
Avail. at most HVAC suppliers and possibly by order at big-box stores?

HTH
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