Open-cell or closed-cell spray insulation in hot humid Bahamas roof?
We will spray insulate the underside of the plywood roof deck with at least R-20 foam. The attic encloses the A/C unit and ducts. The roof is reflective white shingles on Ice/Water membrane. One local installer says I should use an Open Cell (Icynene brand) insulation another says Closed Cell.
I will leave the insulation exposed in the attic apace.
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