construction workers, roofers installing rolls of bituminous waterproofing membrane for the waterproofing of new house. house

basement bitumen bituminous blowtorch builder building coating concrete construction covering flat floor foil foundation house industrial industry installation installing insulation maintenance man manual membrane new primer protection repair roll roller rolls roof roofer roofers roofing rooftop site surface tar technology terrace texture tool torch waterproof waterproofing work worker workers