How to Level the Floor of Prefabricated Houses

Common methods for leveling the floor of prefabricated houses include cement mortar leveling, gypsum leveling, and self-leveling, with specific construction points as follows:

Cement Mortar Leveling

Applicable Scenarios: Suitable for scenarios with poor floor flatness requiring overall adjustment, especially for areas where tiles are to be laid or where high floor strength is required.
Construction Steps:

1. Base Treatment: Thoroughly clean the base surface, remove laitance, oil stains, and loose particles to ensure a solid and debris-free base.
2. Find Elevation and Reference Line: According to the indoor horizontal line and design thickness, snap elevation control lines around the walls and columns, and mark the leveling reference line.
3. Screeding and Marking: Set up longitudinal screeding strips at intervals of 1.5-2 meters, with a height consistent with the elevation line and an error controlled within ±2mm.
4. Material Mixing: Mix the mortar at a ratio of 1:2.5 cement to sand, stirring for no less than 2 minutes to ensure uniformity without lumps.
5. Pouring and Smoothing: Pour the mortar onto the base and use a scraper to initially spread it according to the screeding height, with a uniform thickness covering the screeding.
6. Surface Troweling: Before the initial setting of the mortar (in a semi-dry state), use cement paste to finish the surface, improving flatness and compactness.
7. Curing: Start watering for curing 12 hours after troweling, keeping it moist for at least 24 hours to prevent cracking.

Gypsum Leveling

Applicable Scenarios: Suitable for scenarios with small local flatness deviations (5-20mm), smooth floors, and no need for significant height adjustments.
Characteristics:

• Efficient and Economical: Convenient construction, low cost, and fast drying speed (usually completed within 24 hours).
• Space-Friendly: Thin leveling thickness with minimal impact on indoor ceiling height.
• Limitations: Only suitable for small-scale repairs and cannot withstand heavy loads or long-term humid environments.

Self-Leveling

Applicable Scenarios: Scenarios requiring high-precision flatness, such as base treatment before laying wooden floors or PVC floors.
Construction Conditions: The height difference of the base should be ≤4mm; otherwise, preliminary leveling with mortar is required.
Construction Steps:

1. Base Treatment: Remove dust and oil stains, repair cracks, and ensure the base is dry and solid.
2. Apply Interface Agent: Enhance the bonding strength between the self-leveling material and the base to prevent hollowing.
3. Material Pouring: Evenly pour the self-leveling slurry and use a special scraper to assist in flowing, automatically leveling to the design thickness (2-5mm).
   Characteristics:

• Superior Performance: Smooth surface without cracks, low shrinkage rate, wear-resistant, and dust-proof.
• Short Construction Period: Can be walked on 4-8 hours after construction and floors can be laid 36-48 hours later.