Rigid foam polyurethane is insulation and waterproofing integration?

Rigid foam polyurethane waterproofing and insulation integrated roofing system is a successful example of roofing waterproofing and insulation system, which organically combines different functions into one, forming a very reliable roofing system, solving the problem of roof leakage and the general problem of mutual influence of insulation and waterproofing, also makes the roof with long-term energy-saving effect. However, not all the rigid polyurethane foam can be used as waterproof materials, what kind of materials when the insulation materials, what kind of materials when the integration of waterproof insulation materials, improper selection of materials, but affect the promotion and application of such materials.

Analysis of the current situation

Rigid polyurethane waterproofing and heat preservation integration technology is a construction layer with high closed porosity and integrated function of heat preservation and waterproofing formed by spraying with professional equipment on site through isocyanate, polyether polyol, catalyst, foaming agent, foam stabilizer and flame retardant. The system solves the problem of roof leakage and the common problem that insulation and waterproofing affect each other.

Because of this, some materials emphasize the insulation performance of rigid polyurethane while overemphasizing its waterproof performance, making people mistakenly believe that rigid polyurethane is a waterproof material, and some people have a blurred concept of this, and there are cases in the market where low-density and low-strength rigid polyurethane is also used as a waterproof layer, leading to some serious consequences and affecting the promotion of rigid polyurethane.

Material selection suggestions

Spraying hard foam polyurethane is divided into Type I, Type II and Type III according to its material physical properties.

Physical properties of rigid foam polyurethane

Technical Specification for Roofing Engineering” (GB 50345-2012) clearly stipulates that type Ⅰ sprayed rigid polyurethane shall not be used as a waterproof roofing, but the specification does not involve type Ⅱ, type Ⅲ sprayed rigid polyurethane can be used as a waterproof layer of the instructions.

In the “rigid foam polyurethane insulation waterproofing project technical specifications”, it is pointed out that type II rigid foam polyurethane has excellent insulation performance, but also has a waterproof function. It can be used with surface compound anti-cracking mortar polymer cement to form a composite insulation and waterproofing layer, which can be used in roofing waterproofing projects; Ⅲ type rigid foam polyurethane has excellent insulation performance, but also has excellent waterproofing function, which is a kind of waterproofing and insulation integration material, and can be used in both roofing waterproofing projects and roofing insulation projects.

Draw the point!!!

Sprayed rigid foam polyurethane material, type Ⅰ is used for the insulation layer of roof and external wall, and shall not be used as a waterproofing set up of roof; type Ⅱ has waterproofing function and needs to be used with surface compound anti-cracking mortar polymer cement compound to form a compound insulation and waterproofing layer, which can be used for roof waterproofing project; type Ⅲ is a kind of waterproofing and insulation integration material, which is used for roof insulation and waterproofing layer.

Now spraying rigid polyurethane as a new material integrating waterproofing and heat preservation, what kind of material is used as heat preservation material, what kind of material is used as waterproofing and heat preservation integrated material, correct material selection, and at the same time do a good job of research on supporting materials and construction technology measures to ensure project quality, which is of great significance to promote the promotion of rigid polyurethane materials.