**Baseline Requirements and Treatment for Polyurethane Waterproof Coating Construction**
When applying polyurethane waterproof coating, it's essential to follow proper base preparation to ensure long-term performance and durability. The first step is to apply a 1:3 cement mortar layer on the waterproof base according to design specifications. This layer must be smooth, evenly spread, and free from defects such as uneven surfaces, loose areas, sanding, or dusting. Drain outlets or floor drains should be positioned slightly lower than the overall waterproof layer to prevent water accumulation. Additionally, the casing pipes should extend at least 20mm above the base surface to avoid water seepage. The internal and external corners should be rounded with a radius of 10mm to facilitate even paint application and reduce stress points.
All pipe fittings, sanitary fixtures, floor drains, and drainage systems must be securely installed, with tight joints and smooth finishes. Any looseness or gaps can compromise the waterproofing integrity, so thorough inspection is crucial before proceeding.
During the construction process, when using traditional polyurethane waterproof coatings, the base layer should be nearly dry, with a moisture content below 9%. A simple test involves placing a 1m² rubber sheet (1.5–2.0mm thick) over the surface for 2–3 hours. If no water marks appear on the underside of the sheet and there’s no condensation on the base side, the moisture level is acceptable. Based on experience, this condition ensures that the base is suitable for coating application.
Before starting the coating work, the base surface must be thoroughly cleaned. Remove any protrusions, excess mortar, or debris using a blade and broom. Dust, dirt, and foreign objects should be completely removed. Pay special attention to corners, pipe roots, drains, and other hard-to-reach areas. If oil, rust, or other contaminants are present, use a wire brush, sandpaper, or organic solvents to clean them effectively. A clean and dry surface is critical for optimal adhesion and performance of the waterproof coating.
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