WEBRoof Hatch - Ladder Access. 4.8(17 reviews) All BILCO roof hatches are ruggedly built for long, dependable service. Covers feature a box-type design to support a 40 lb/ft2 (195 kg/m2) live load. The capflashing, fully welded corners, EPDM rubber gasket, fiberglass cover insulation and rigid fiberboard curb insulation ensure weathertightness and ...