Method of Application for Polyethylene-Polypropylene Composite Waterproofing Membrane
1.Active Process Description:
Level the substrate to create a smooth foundation.
Mix and prepare the adhesive for application.
Treat complex areas, including corners, drainage points, and pipe penetrations.
Apply the waterproof layer evenly across the surface.
Inspect the waterproof layer for consistency and defects.
Construct and approve the protective layer.

2.Active Instructions:

Clean and moisten the screed layer to retain adequate moisture.
Ensure the roof waterproof screed meets the standards in GB50207-2002 Road Engineering Quality Acceptance Specification.
Verify compliance of underground waterproof screeds with GB50208-2002 Code for Underground Water Quality Acceptance.

3. Prepare a cement paste adhesive using polyvinyl alcohol glue, incorporating 5% to 15% cement. Ensure that the mixture is homogeneous, free from sedimentation, clumping, or segregation.

4. Prior to the installation of the primary waterproof layer on the roof, it is crucial to seal and secure the detailed nodes where drainage is concentrated and where complex structures are present.

5. The sealing material should be of the polyether type polyurethane. It is important to avoid using other sealing materials that may contain mineral oil or petrolatum, as these can adversely affect the properties of polyethylene.

6. Additional layers must be applied at corners, ensuring that the yin and yang corners are rounded to a radius of 20mm.

7. The installation of the waterproof membrane should follow a full shop method, with adhesive applied uniformly to the substrate.Avoid exposing areas or allowing adhesive to accumulate. Apply the adhesive just before laying the membrane to maintain optimal bonding quality.

8. The width of the lap for the waterproofing membrane must be a minimum of 100mm.

9. Offset the joints between the upper and lower floors, as well as the adjacent webs, by one-third of their width.