1. Base Surface Preparation: Ensure "No Hidden Risks"
The base surface must be cleaned to completely remove sharp debris such as gravel, sand, and nails, preventing the material from being pierced or scratched after construction.
The base surface needs to be flat (allowable error ≤ 5mm/2m). If there are protrusions (e.g., steel bar ends, concrete lumps), they must be chiseled off and leveled with mortar; if there are cracks, sealing treatment (e.g., pouring waterproof mortar) must be done first.
The base surface must be dry with a moisture content ≤ 9% (testable by the dry-laying method: lay the membrane and let it stand for 4 hours; if there is no water mark under the membrane, it is qualified), to avoid hollowing that leads to waterproof failure later.
2. Material Transportation and Storage: Eliminate "Pre-Damage"
Handle with care during transportation; dragging, throwing, or dropping is prohibited to prevent the material's edges or surface from being scratched by sharp objects (e.g., forklift tines, shelf corners).
When storing, stack the materials on an elevated surface (at least 10cm above the ground) to avoid moisture erosion from the ground; meanwhile, keep them away from fire and heat sources (e.g., welding areas, radiators) to prevent material aging or deformation, which affects puncture resistance.
3. Construction Operation: Control "Key Details"
When cutting the material, reserve an overlap edge of ≥ 10cm (specifically in accordance with the material instruction manual). The overlap area must be pressed tightly and sealed (for the hot-melt method, ensure glue overflows from the edge; for the self-adhesive method, repeatedly roll with a pressure roller) to prevent water seepage from the overlap joint.
Check construction tools (e.g., scrapers, pressure rollers) for sharp burrs to avoid scratching the material surface during operation; if mechanical construction is used (e.g., membrane laying machines), adjust the pressure properly to prevent material damage due to excessive pressure.
For node areas such as internal and external corners and pipe roots, first lay an additional layer (width ≥ 25cm), then lay the main waterproof layer. The node areas must be pressed extra tightly to avoid material puncture or cracking caused by stress concentration.
4. Finished Product Protection: Prevent "Post-Damage"
Within 48 hours after the waterproof layer construction is completed, unauthorized treading is prohibited, and stacking of sharp tools and building materials (e.g., steel pipes, ceramic tiles) is forbidden.
During the construction of subsequent processes (e.g., laying protective layers, pouring concrete), place protective materials such as wooden boards and geotextiles on the waterproof layer to prevent construction machinery (e.g., vibrators, wheelbarrows) from directly rolling or piercing the waterproof layer.
5. Acceptance Process: Check for "Potential Problems"
During acceptance, inspect the waterproof layer point by point, focusing on scratches, damage, and hollowing (tap lightly with a small hammer; it is qualified if the hollow area is ≤ 0.1㎡ and there are no more than 2 places per 100㎡).
If damage is found, repair it in time: for small damages, cut a patch of the same material with an overlap of ≥ 10cm around; for large damages, cut off the damaged area, re-lay the material, and ensure good overlap sealing.
