What are the waterproof materials for external walls?

Exterior wall waterproofing can be roughly divided into the following categories according to its characteristics and forms:

A, rigid waterproof material

Generally, it refers to all kinds of waterproof mortar with cement as the main component, which has certain impermeability, high compressive strength and good bonding performance. Because the waterproof mortar is mostly composed of inorganic materials such as cement and quartz sand, it has good durability, but it is not extensible and has poor adaptability to base deformation. However, by adding organic modified components, waterproof mortar can have certain toughness and good bending performance. Polymer cement waterproof mortar is a rigid waterproof material with good compressive and flexural strength. By adding polymer dry powder or polymer emulsion into cement mortar, the material has a certain toughness, and better bonding performance and impermeability are obtained.

Polymer cement waterproof mortar is a material between rigidity and flexibility. Compared with polymer cement waterproof mortar, more polymer components are introduced into the product, which makes it more flexible, has a certain deformation ability and even a certain bending performance, and also has better cohesiveness and impermeability.

Second, flexible waterproof materials

Generally, it refers to all kinds of organic waterproof materials, and can also be used as flexible waterproof materials for external walls, such as polymer emulsion waterproof coatings and polyurethane waterproof coatings. Flexible waterproof coating has good tensile properties and flexibility, and can resist the tiny cracks in the base wall. Polymer cement waterproof coating (JS coating) is an inorganic composite coating with certain tensile strength and elongation.

Third, hydrophobic materials.

Generally speaking, it refers to a colorless transparent coating with a certain hydrophobic function, an aqueous or solvent-based aqueous solution with silane and siloxane as the main raw materials, or an aqueous solution with inorganic nano as the raw material, which is used for the decorative surface of concrete or other external walls. The coating film has a lotus leaf-like surface structure. When water falls on its surface, it will form water drops and roll down due to the surface tension, so it can prevent rainwater from invading the interior of the wall and has a certain waterproof effect.

Fourth, the sealing material.

Generally, it is a viscous paste made of natural or synthetic resin rubber, such as silicone sealants, polyurethane sealant, acrylic sealant, etc., which is used to seal various joints or holes in buildings to prevent gas, liquid and solid from penetrating and structural materials from being damaged during structural deformation. The sealant can change with the shape of the sealing surface and has good adhesion to the base surface.

Verb (abbreviation of verb) permeates the membrane.

It is a new type of polymer breathable waterproof material, which has functional characteristics that other waterproof materials do not have. When the waterproof breathable film is used for waterproof protection of external thermal insulation of the building envelope, it not only strengthens the air tightness and water tightness of the building, but also has its unique air permeability, which can make the water vapor in the structure discharge quickly, avoid mold breeding in the structure, protect property value, and perfectly solve the problems of moisture prevention and human health. The rapid discharge of water vapor protects the thermal performance of the envelope, which is a healthy and environmentally friendly new energy-saving material.