How to Calculate the Area of Prefabricated Houses
The calculation of the area of prefabricated houses should be determined based on the structural type and measurement specifications, specifically divided into three categories: single-story, multi-story, and other structures. The calculation rules are as follows:
1. Area Calculation for Single-Story Prefabricated Houses
The area of a single-story prefabricated house is calculated as the sum of the horizontal projected areas above the plinth on each floor. The core rule is that the floor height determines the area proportion:
- Full Area Calculation: If the house height reaches or exceeds 2.20 meters, the full horizontal projected area should be calculated.
- Half Area Calculation: If the height is less than 2.20 meters, only half of the horizontal projected area should be calculated.
- Utilization of Sloped Roof Space: If the house has a sloped roof design and the interior space is utilized, further division based on the clear height is required:
- Areas with a clear height exceeding 2.10 meters are calculated as full area;
- Areas with a clear height between 1.20 meters and 2.10 meters are calculated as half area;
- Areas with a clear height less than 1.20 meters are not included in the area calculation.
2. Area Calculation for Multi-Story Prefabricated Houses
The area calculation for multi-story prefabricated houses should be handled floor by floor, with slightly different rules for the first floor and upper floors:
- First Floor Area: Calculated based on the horizontal area of the structural perimeter above the plinth. If the floor height reaches or exceeds 2.20 meters, the full area is calculated; if it is less than 2.20 meters, half the area is calculated.
- Upper Floor Area: For floors above the second story, the area is calculated based on the horizontal area of the structural perimeter of the exterior walls. The floor height standard is the same as that of the first floor (≥2.20 meters for full area, <2.20 meters for half area).
- Special Space Handling:
- For spaces under sloped roofs or in stadiums' under-seat areas, if the design is utilized, areas with a clear height exceeding 2.10 meters are calculated as full area, areas between 1.20 meters and 2.10 meters are calculated as half area, and areas not utilized or with a clear height less than 1.20 meters are not calculated.
3. Area Calculation for Other Structural Prefabricated Houses
The area calculation for some附属 (ancillary) structures should be handled separately. Common types include:
- Balconies: Regardless of whether they are enclosed or not, they are calculated as half of the horizontal projected area.
- Canopies: Only when the width from the outer edge of the structure to the outer edge of the exterior wall structure exceeds 2.10 meters, half of the horizontal projected area of the canopy structure slab is calculated. If the width is less than 2.10 meters, it is not calculated.
- Corridors:
- Permanent corridors with columns are calculated as full area based on the horizontal area of the column perimeter;
- Corridors without columns but with a roof are calculated as half of the horizontal projected area of the structural floor;
- Corridors without columns and without a roof are generally not calculated in area.
Summary: The area calculation of prefabricated houses must strictly adhere to the structural type and floor height standards. Single-story and multi-story houses use floor height as the dividing line, while special structures such as sloped roofs, balconies, and canopies should be converted based on clear height or projection ratio. In actual calculations, it is necessary to combine design drawings with measurement specifications to ensure accurate data.
