How to Do Well in Prefabricated House Mezzanine

The construction of a prefabricated house mezzanine requires a comprehensive design that takes into account floor height, structure, space allocation, and safety details. The specific plan is as follows:

1. Floor Height Planning and Space Optimization
It is recommended that the net floor height be ≥4.5 meters, ensuring that the lower floor is ≥2.2 meters and the upper floor is ≥2.0 meters to avoid a sense of oppression. If the original building's floor height is insufficient, space occupation can be reduced through the following methods:

• Steel Beam + Thin Floor System: Adopt a steel-concrete or steel-wood structure with a structural layer thickness of 10-16 centimeters to reduce vertical space occupation.
• Partial Second-Floor Design: Reserve open spaces above stair halls and bathrooms, and only build mezzanines above bedrooms or studies to balance functionality and transparency.
• Movable Floor Solution: If floor height restrictions are strict, a detachable movable floor can be constructed to flexibly adjust usage scenarios.

2. Structural Selection and Adaptation Scenarios
Choose an appropriate structure based on needs, balancing performance and cost:

• Fully Cast-in-Place Structure: Excellent sound insulation and fire resistance, with strong integrity, but heavy self-weight. It is necessary to confirm the original building's load-bearing capacity, and the construction and curing period is long (more than two weeks).
• Steel-Concrete Structure: The floor thickness is 10-16 centimeters, and wooden flooring can be laid directly after completion, suitable for scenarios with high flatness requirements, but requiring professional team construction.
• Steel-Wood Structure: Lightweight and low-cost, suitable for studios or temporary housing, but with average sound insulation and fire resistance, and wooden floors are prone to moisture deformation.
• Pure Steel Flooring: Fast construction speed, but with loud footstep noise and cold return in winter, which can be improved by laying sound insulation cotton + elastic cushion layers.
• Prefabricated Ultra-Thin Solution: Such as the TD-LOFT system, which uses corrugated steel plates for load-bearing, with a finished thickness of only 100-120 millimeters, integrating decoration, waterproofing, and fire resistance functions, suitable for residential or commercial spaces with high net height requirements.

3. Space Allocation and Functional Layout

• Open Design in Public Areas: Retain open spaces in living rooms, dining rooms, etc., to enhance spatial transparency; fully build mezzanines above bedrooms and studies to improve practicality.
• Floor Thickness Control: It is recommended that the floor thickness be 15-20 centimeters, reserving space for pipelines (such as electrical circuits and air conditioning ducts) and sound insulation layers (such as sound insulation felt or acoustic cotton).

4. Safety and Detail Handling

• Structural Safety: Steel structures require sound insulation treatment (such as filling with sound insulation cotton), and concrete structures require professional testing to confirm the original building's load-bearing capacity.
• Protective Facilities: The railing height should be ≥1.05 meters, with glass or vertical bar grille designs preferred to balance safety and transparency; the stair tread depth should be ≥24 centimeters, with a slope ≤38 degrees to ensure comfortable walking.
• Moisture Proofing and Ventilation: The second-floor space requires moisture-proof treatment (such as applying waterproof coatings) and pre-burying air conditioning and fresh air ducts to avoid moisture and poor air circulation problems.

The final plan should be comprehensively evaluated based on the original building's structural inspection report, budget, and usage needs (such as living or office), and it is recommended to entrust a professional team for structural calculations and construction.