Waterproof and breathable membrane construction technology

1. After selecting a good waterproof and breathable membrane, try to avoid penetrations and openings in the waterproof and breathable membrane during the construction process, and try to ensure the integrity of the waterproof and breathable membrane. If openings or penetrations are necessary, seal the penetrations and openings with butyl tape.

2. Since the waterproof and breathable membrane has no obvious flame retardant effect, we should try to avoid the use of welding on the curtain wall project connectors. Arrange open flame operations (including welding) before the construction of the waterproof and breathable membrane. Avoid open flames, welding or high temperatures on the membrane. (>90℃) operation. If there are special needs, the membrane should be effectively shielded and heat insulation measures should be taken to prevent the material from being exposed to fire or high temperature.
3. When laying the waterproof and breathable membrane, you can choose the loose laying method according to the actual situation. Fix the waterproof breathable membrane and the insulation cotton with rock wool nails. The rock wool nails at the fixed location are sealed with butyl tape. The area of the sealing area is Butyl tape completely covers the nail head as standard.

4. Clean the dust and oil on the corner code before construction, and ensure that the corner code is clean to ensure the bonding effect between the corner code and the waterproof and breathable membrane. If it cannot be cleaned, the waterproof and breathable film and the base layer will not be firm, which will affect the waterproof and breathable film. air tightness. Where the corner code passes through the waterproof and breathable membrane, the integrity of the waterproof and breathable membrane should be ensured as much as possible. The curve of the waterproof breathable membrane will be flooded to completely seal the corner code with the waterproof and breathable film. The bonding between the sealing part and the corner code shall not be less than 2cm.

5. Overlap the waterproof and breathable membrane with the window frame and door frame, use the waterproof breathable membrane to seal the linear flooding, and apply the waterproof breathable membrane to seal the corners with curved flooding. The bonding width between the sealing part and the window frame and door frame shall not be less than 4cm, and the bonding width at the corner shall not be less than 10cm. The installation sequence is: the lower part of the door and window frame → the lower corner of the door and window frame → the side frame of the door and window frame → the upper corner of the door and window frame → the upper part of the door and window frame → sealing. In case of abnormal weather, protective measures should be taken and temporary fixing should be added.

6. During roof construction, the waterproof and breathable membrane should be laid along the water direction of the roof, with an overlap length of 10cm. When the high-strength aluminum alloy bracket of the roof passes through the waterproof and breathable membrane, the intersection between the aluminum alloy bracket and the waterproof and breathable membrane should be Seal with butyl tape all around. In addition, the waterproof and breathable membrane should not be exposed to ultraviolet light for a long time, and the exterior facing project should be completed as soon as possible.