Cathedral Ceiling Insulation between rafter
I am looking for ideas/options to provide some sort of heat relief from hot ceiling shared with roof & inside home with no attic. The roofing material is mix of modified bitumen & shingles in different areas with minimal/zero insulation.
I live in Florida and the ceiling often heats to over 110 degrees on hot days. I provide some relief now by watering my roof for 5 minutes spurts during hottest times of days which works okay with mini-split systems throughout home. If I can get roof down to 90-95 degrees then cooling can keep up.
I think the best long-term solution is to add ventilated roof on top of existing room with insulation like spray and then put a metal roof over that but looking for something quicker/cheaper for now.
I’ve looked a couple product in ecofoil bubble foil and prodex 10 that look that they can provide some relief from the heat impact if I provide airgap of 1-2 inches between product and the roof. The white version of these may be okay to be exposed in areas (mostly bedroom) I am looking to bring down the heat on. I know these has low/incorrect R value for they are but think the airgap and setup could lower impact 20-25 degrees which can help a lot.
Are there any other options/suggestions for cooling off the ceiling beyond these product and watering roof?
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