1. Grass-roots requirements: grass-roots level must be dry, clean, flat, the surface shall not have loose, peeling, sanding phenomenon. Grass-roots surface shall not have floating ash and oil, oil pollution of the grass-roots level can be contained in a water solution of washing powder scrub, and then rinse with water. Grass-roots dryness can be used to stick the cling film, at least one night to observe the phenomenon of moisture. The slope of the grass-roots level slope layer must meet the design requirements, the grass-roots level should be in line with the DBJ/CT017-2005 specification requirements, and through the hidden acceptance.

2. roof and daughter wall, gutter, gutter, protruding roof structure of the connection with 1:2.5 cement mortar to make arc, arc radius of 80 ~ 100 mm, in the outstretched roof around the pipeline to make the steamed buns; drop mouth, pipeline out of the roof parts and other waterproofing key parts, in the spraying 2 days before the pre-painting polyurethane waterproofing coatings for two degrees for detail treatment. Roof insulation should be articulated with the external wall insulation layer to prevent thermal bridging.

3. The incoming raw materials must be checked and accepted through the inspection, ready for the required raw materials to ensure that continuous construction. By the manufacturer according to the design of the density, strength and other performance requirements, to determine the group A, group B, foaming agent, curing agent, homogenizer, flame retardant ratio, additives first added to group A, and should be mixed evenly.

4. Check and debug the spraying equipment, metering pump, pneumatic pressure. Formal spraying before the same grass-roots level, using the same process for sample construction, and after the test is qualified, before allowing the construction of large areas.

5. Understand the weather conditions and the construction environment, choose a sunny weather time period construction, to ensure that the foam body normal solidification; around the good enclosure facilities, to prevent the foam flying.