I am an insulation contractor and one of the jurisdictions we work in has begun to demand that fireproof sealants in penetrations to conditioned space from attics and crawlspaces. We have always used a non-warping 1-part foam around electrical and plumbing penetrations. Does anyone know of a non-warping expanding foam that is considered fireproof? We have intumescent caulk that we use in certain areas but many times the holes drilled by the plumbers and electricians are too big to fill with caulk. Thanks for any leads anyone can provide!