Cover closed-cell spray foam with draped insulation for unfinished basement walls?
(Zone 5) We specified R-20 min CCSF on interior of all foundation walls with the assumption that it would mean framing a wall, spraying, and covering with drywall. This will be done for all finished areas, but not the unfinished areas. My general has stated he did not bid the job this way, and there will be an upcharge for framing and drywall. Is the approach he has stated even allowed? What issues would there be? He is planning for the draped (diaper?) insulation be used to basically function as the fire/ignition break for the spray foam. I am nervous about this approach and don’t want to go this way.
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