Insulation for Standing-Seam Metal Roof in Hot Climate
We’re in the design phase for two SFRs in central Texas between San Antonio and Austin. Sites are on the border of IECC climate zones 2 and 3. Conventional frame construction. Roofs will be standing seam metal. Would like to have ≥ R38 for the roof insulation.
The attics will be inside the conditioned space. Conditioning will include dehumidification. In terms of air sealing, we plan to achieve ≤ 3 ACH50.
None of the framing or roofing subs we’ve talked with have done exterior (to the roof sheathing) insulation.
Looking for ideas to get to the insulation levels described above. Both closed and open foam have been suggested by various potential subs.
Any thoughts/recommendations on alternatives to get to or above the R38 would be much appreciated. Thanks.
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