Rigid polyurethane foams body closed pore rate p, bibulous rate more than 1% 95%, energy saving, good insulation effect, rigid polyurethane foams body is high-density closed pore bubble compounds, coefficient of thermal conductivity 0.022 acuities W/mk, energy-saving effect is good. Construction thickness can achieve its energy-saving 40mm p 65% requirements. Rigid polyurethane foams body the compressive strength 300Kpa p according to actual situation, still can increase compressive strength to 600Kpa above, meet different requirements of the project. (2) rigid polyurethane foams body direct spray in roof layer, by pressure effect of reaction materials directly through the gun mixture formation, foam molding. Liquid materials with liquidity, permeability, could enter the roofing grassroots gap, and grassroots firm foamed adhesive and play the role of sealing gap. Its bond strength over the rigid polyurethane foams body itself, thus make hard tear strength with roofing grassroots bubble layer become one, not easy delaminates, to avoid the roof water along the level aperture infiltration. Rigid polyurethane foams body can and wood, metal, bricky stone, concrete, etc. Various kinds of materials firm bonding. (3) strong resistance to penetration ability, through the mechanical construction, roofing form no juncture continuous shell. Heterosexual roofing construction, terminal handling extremely simple, waterproof properties is reliable. Light weight, greatly reducing roof load 40mm rigid polyurethane foams body instead of the traditional practices among the waterproof layer, thermal insulation layer and the screed-coat 40mm thick, and rigid polyurethane foams body weight per square metre about 2.4 kg, greatly reduce roof load, suitable for all kinds of plane, curved surface, the complexity of the results of the roof. The temperature range anti-aging strength. Rigid polyurethane foams body below - 50 ℃ condition is not brittle fracture in high temperature + 150 ℃ cases don't flow, not adhesion, normal use, and weak resistance, chemical substances stoichiometric erode. Construction is quick, simplify the roofing overall construction craft mechanical construction, construction workers, reduce less safe hidden trouble, a set of imported equipment in good condition can accomplish the 800 -- every day of 1000 square meters of construction waterproof insulation materials, than conventional construction time save 80%. The old roof maintenance, as the old grassroots re-construction debonded, has not occurred within drum, can not rooting out the old grassroots directly in the old grassroots on spray application reduce project strength and difficulty, save the project construction cost and the construction time, no foam, green non-pollution adopts advanced sight foaming technology, accord with environmental protection requirement.