The rigid foam polyurethane waterproof and thermal insulation integrated roof system is a successful example of a roof waterproof and thermal insulation system. It organically combines different functions into one to form a highly reliable roof system, which solves the problem of roof leakage and thermal insulation and waterproofing. The common problem of mutual interaction also makes the roof have a long-term energy-saving effect. However, not all rigid foam polyurethane can be used as waterproof materials. What kind of materials are used as thermal insulation materials, and what kind of materials are used as integrated waterproof and thermal insulation materials. Improper material selection will actually affect the promotion and application of this type of material.
Current situation analysis
Integrated technology of rigid foam polyurethane waterproofing and thermal insulation is formed by spraying isocyanate, polyether polyol, catalyst, foaming agent, foam stabilizer and flame retardant on-site using professional equipment to form a high closed-cell rate, integrated thermal insulation and waterproofing Functional structural layer. This system solves the problem of roof leakage and the common problem of mutual interaction between insulation and waterproofing.
For this reason, while some information emphasizes the thermal insulation properties of rigid polyurethane foam, it also overemphasizes its waterproof performance, making people mistakenly believe that rigid foam polyurethane is a waterproof material. Some people even have a vague concept of this. There are cases in the market where low-density, low-strength rigid foam also serves as a waterproof layer, which has led to some serious consequences and affected the promotion and use of rigid foam polyurethane.
Suggestions on material selection
Spray rigid foam polyurethane is divided into Type I, Type II and Type III according to its material physical properties.
Physical properties of rigid polyurethane foam
The “Technical Specifications for Roofing Engineering” (GB 50345-2012) clearly stipulates that type I spray rigid foam polyurethane shall not be used as a first layer of waterproofing on the roof, but the specification does not cover whether type II and III spray rigid foam polyurethane can be used as a first layer of waterproofing. Description of the layer.
In the “Technical Specifications for Rigid Foam Polyurethane Thermal Insulation and Waterproofing Engineering”, it is pointed out that type II rigid foam polyurethane has excellent thermal insulation performance and also has waterproof function. It is used in combination with surface composite anti-cracking mortar polymer cement to form a composite thermal insulation and waterproof layer, which can be used in roof waterproofing projects. Type III rigid foam polyurethane has excellent thermal insulation performance and excellent waterproof function. It is a waterproof and thermal insulation integrated Chemical materials can be used for both roof waterproofing and roof insulation projects.
Make important points! ! !
Sprayed rigid foam polyurethane material, Type I is used for the insulation layer of roofs and exterior walls, and cannot be used as a waterproof fortification of the roof; Type II has waterproof function and needs to be used in combination with surface composite anti-cracking mortar polymer cement to form composite insulation The waterproof layer can be used for roof waterproofing projects; Type III is an integrated waterproof and thermal insulation material, used for roof thermal insulation and waterproof layers.
As a new material that integrates waterproofing and thermal insulation, sprayed rigid foam polyurethane is now used. What kind of material is used as thermal insulation material? What kind of material is used as integrated waterproofing and thermal insulation material? Select the material correctly and make supporting materials at the same time. Research on and construction technical measures to ensure project quality is of great significance to promote the promotion of rigid foam polyurethane materials.
