(One Hundred Questions on Waterproofing) Which series of waterproof materials should be used for the water storage tank in a #85new construction site? What are the standard construction specifications?

Answer:

A: According to the waterproofing standards of the Japan National Association of Architects JASS No. 8, it is recommended to use water-based and solid-state waterproofing materials (categorized into acrylic resin series and EVA resin series; the former has a pH value of approximately 7–9, the latter has a pH value of approximately 4.5–6; this common sense should be known by construction contractors, as the chemical reactions caused by pH values can affect the effectiveness of waterproofing). The standard construction steps are as follows:

1. Construction timing: Waterproofing should be done first, then the base coat should be applied; do not reverse the construction process.
2. Surface cleaning and leveling: Wire cutting (internal and external cutting), template debris removal, mud and slurry removal, and filling of concave holes with resin mortar.
3. Corner secondary construction seams, cracks, and V-shaped grooves on water pipes, and reinforce with resin mortar or non-shrinkage waterproof cement (strength ≥ 5000 PSI).
4. Base material: 0.2~0.3kg/㎡.
5. Water-based and solid-state waterproofing primer: 0.7kg/㎡.
6. Water-based and solid-state waterproofing coating: 0.7kg/㎡.