The surface of the base layer should be solid, flat, clean and free of impurities such as oil and dust. First, use a broom, vacuum cleaner, etc. to thoroughly clean the base layer, grind the raised parts, and fill the concave parts with cement mortar to level them, so that the flatness error of the base layer is controlled within a reasonable range, creating good conditions for self-leveling construction.
Strictly follow the product instructions to mix the gypsum self-leveling material and water. Too much water will cause the slurry to be too thin, resulting in problems such as dripping and large shrinkage after drying; too little water will make the slurry poor in fluidity and difficult to self-level. Use precise measuring tools, such as electronic scales and measuring cups, to ensure accurate material ratios.
Use an electric stirrer and stir at a low speed. First, add part of the water to the mixing container, then pour in the gypsum self-leveling material, and then gradually add the remaining water according to the situation. The stirring time is generally 3-5 minutes to ensure that the slurry is uniform and free of lumps, and achieves good fluidity and construction performance.
Use appropriate scrapers, defoaming rollers and other tools. The scraper is used to initially scrape the slurry to ensure that the slurry is basically flat over a large area; the defoaming roller can eliminate bubbles in the slurry to avoid uneven surface caused by bubble bursting.
The construction environment temperature should be between 5-35℃ and the humidity should be around 40%-60%. Too low temperature will cause the gypsum self-leveling to solidify for too long, while too high temperature will cause it to dry too quickly and affect the flatness. Improper humidity can cause condensation, uneven drying and other problems.
During construction, the slurry should be poured continuously and evenly from one side of the room to allow it to level itself to avoid local accumulation or poor flow of the slurry. The construction personnel should operate skillfully and quickly to ensure that the construction is completed within the time when the slurry can be operated.
After the construction is completed, timely maintenance should be carried out, and methods such as covering with plastic film can be used to prevent the water from evaporating too quickly. During the drying process, the flatness should be checked regularly, and local unevenness can be polished after drying.
