Installation steps of roof hatch.

Standard installation steps Positioning opening According to the drawing, cut the roof insulation layer and waterproof layer (keep the integrity of the structural layer), and trim the edge of the hole. Reinforce the border Add additional keel or welded steel frame around the hole, fix it firmly and do rust prevention treatment;

The top surface of the frame should be slightly higher than the finished surface by 2-3mm to facilitate drainage. Install the access door assembly Embedding the finished inspection frame into the hole and fixing it with expansion bolts or welding; After leveling, install the cover plate (the hinge side faces the direction of easy opening). Anti-skid pedal, safety guardrail and anti-falling device (in line with GB 50352) should be added to the man-up type.

4. Waterproof sealing treatment Filling foaming agent at the joint between the frame body and the roof → brushing the basic treatment agent → laying additional waterproof layer (the coil is turned up by 250 mm or more) → closing and sealing with weatherproof sealant.