In general, the atmospheric temperature of polyurethane insulation construction site should not be lower than 15 °C, the relative air temperature should be less than 85%, otherwise it will affect the quality of the project, reduce construction efficiency and curing time; wind force should be less than 3, or polyurethane foam bubble Under the influence of wind power, it will fly around, affect the surrounding environment of the construction site and spraying construction, and it cannot guarantee that the surface of the sprayed polyurethane foam layer will show a continuous and uniform spray ripple. When the wind force is greater than 3, wind protection measures should be adopted.
The urethane roof waterproof insulation has obvious advantages in roof waterproof anti-corrosion and heat preservation. When the construction object is the concrete layer of the building roof, the slope layer or leveling layer should be set. The slope layer or screed should be solid and smooth (it must not be markedly waterlogged), and it should be dry (its moisture content should be less than 8%), and there should be no surface ash and oil. The drainage slope of the flat roof should not be less than 2%, and the vertical drainage slope of the gutters and gutters should not be less than 1%. The connection between the roof and gables, parapets, gutters, gutters, and protruding roof structures should be arc-shaped with a radius of R=80-100mm. The equipment, pipelines, etc. on the roof should be installed in place before the hard foam polyurethane waterproof heat-insulating spray coating is applied, so as to avoid cutting the surface of the waterproof insulation layer. The thickness of the rigid foam waterproof layer that does not require insulation (such as gables, parapets, and protruding roofs) should not be less than 20 mm. It should be sprayed several times. The thickness of each spray should be about 10-15mm. The raw material of the polymer protective layer is coated on the surface of the modified hard foam with a scraper, and the scraping is required to be performed in three times. The thickness of the protective layer is about 5 mm, and the thinnest part is not less than 3 mm.
Hard foam polyurethane spray roof waterproof main performance indicators:
Project Unit Performance Index
Density Kg/m3≥55
Thermal conductivity w/mk≤0.022
Water absorption v/v% ≤ 1.0
Compressive strength mpa≥0.3
Dimensional stability (70 °C ± 1 °C, 48h)% ≤ 1.0
The main features of polyurethane roof waterproofing project:
(1) Urethane hard foam body closed porosity ≥ 95%, water absorption rate ≤ 1%, energy saving, heat insulation effect is good, polyurethane hard foam body is a high density closed-cell foam compound, thermal conductivity ≤ 0.022W/mk, energy saving The effect is good. Construction thickness ≥ 40mm can achieve energy-saving 65% of the requirements. The compressive strength of polyurethane rigid foam body is ≥300Kpa, and the compressive strength can be increased to above 600Kpa according to the actual situation, which satisfies various requirements of the project.
(2) The urethane rigid foam body is sprayed directly on the roofing layer, and the reaction materials are subjected to pressure, and the mixture formed by the spray gun is directly foamed. The liquid material has fluidity and permeability, can be foamed into the voids of the roof base layer, firmly adheres to the base layer and plays the role of sealing voids. The bond strength exceeds the tear strength of the polyurethane foam body itself, so that the rigid foam layer and the roof base layer are integrated, and the delamination is not easy, so that the penetration of the roof water along the level gap is avoided. Polyurethane rigid foam can be firmly bonded to various materials such as wood, metal, masonry, and concrete.
(3) Anti-permeability, through mechanical construction, the roof forms a seamless continuous shell.
(4) The surface is easy to construct, the end point processing is simple and convenient, and the waterproof performance is reliable.
(5) Light, greatly reduce the roof load polyurethane foam body 40mm instead of the traditional practice of the waterproof layer, insulation layer and the middle leveling layer, etc., and 40mm thick polyurethane rigid foam body weight per square meter of about 2.4kg, greatly Reduce the roof load, suitable for all kinds of planes, curved surfaces, and roofs with complex results.
(6) The temperature range of intensity is large.
(7) Urethane hard foam bodies are not brittle at temperatures below -50°C, do not flow at high temperatures +150°C, do not stick, can be used normally, and are resistant to weak acids, weak bases and other chemical substances.
(8) The work is simple and rapid, simplifies the mechanized construction of the entire construction process of the roof, employs few construction workers, reduces potential safety hazards, and a set of imported equipment can complete 800-1000 square meters of construction per day under good conditions, which is more than conventional waterproof insulation material construction time. Save 80%.
(9) Roofing renovation and renovation, when the old grassroots layer did not delaminate, drum, can not eradicate the old grass-roots, polyurethane spraying directly on the old grass-roots level construction to reduce the project strength and difficulty, save the project cost and construction time, no fluoride Foam, green, pollution-free Adopt advanced fluorine-free foaming technology and meet environmental protection requirements.
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