Floor Heating in Prefabricated Slab Houses

Prefabricated slab houses can be equipped with floor heating, but an appropriate plan should be selected according to the house conditions. Dry-type floor heating or ultra-thin floor heating is preferred, and for wet-type floor heating, strict load-bearing assessment and standardized construction are required.

I. Plan Selection and Load-Bearing Adaptation

1. Dry-type Floor Heating:
   • Core Advantages: After fixing the pipes with aluminum film plate clips, the floor can be laid directly. The system weight is only about 30 kg per square meter, which is only one-third of that of wet-type floor heating, and it heats up quickly (about 30 minutes). It is suitable for temporary use or houses with limited floor height.
   • Applicable Scenarios: For old-style prefabricated slab houses (with a typical load-bearing limit of 200 kg per square meter), when the combined weight of tiles, furniture, etc., is likely to exceed the limit, dry-type floor heating can avoid risks.
2. Wet-type Floor Heating (subject to strict conditions):
   • Load-bearing Assessment: A structural engineer must calculate the floor load-bearing capacity to ensure that the combined weight of floor heating, tiles, furniture, etc., does not exceed 200 kg per square meter.
   • Material Optimization: Use lightweight pea-gravel concrete for backfilling, with a thickness not exceeding 5 cm, to reduce the weight per unit area.
   • Construction Specifications: It is strictly prohibited to drill holes in or cut the steel bars of the prefabricated slabs. Otherwise, it may lead to floor slab fractures (such as a case where a homeowner caused balcony cracks by drilling holes on their own).
3. Alternative Plans:
   • Exposed Radiators: Weighing about 20 kg per square meter, they do not require damage to the floor slab structure and are suitable for situations where the load-bearing capacity or floor height does not meet the requirements.
   • Air Conditioning Heating: It is easy to install but has relatively high energy consumption and is suitable as an auxiliary heating method.
   • Ultra-thin Floor Heating: With a thickness of 12 - 30 mm, it does not require concrete backfilling and can be directly laid with wooden floors or tiles. It is suitable for the renovation of old buildings.

II. Construction and Acceptance Precautions

1. Policy Compliance: Before construction, confirm whether local policies allow renovation. Some regions offer subsidies for old house renovations.
2. Crack Inspection: During acceptance, focus on checking whether there are cracks in the floor slab. Cracks thicker than a hair are unqualified and require immediate rectification.
3. System Selection: Give priority to modular floor heating systems, which are convenient for installation and maintenance and reduce the later failure rate.

III. Long-term Use Recommendations

• Regular Maintenance: Check the tightness of the floor heating pipes every 2 - 3 years to prevent water leakage from causing the floor slab to get damp.
• Furniture Distribution: Avoid concentrating heavy objects (such as large fish tanks and bookcases) in a single area to prevent local overloading.
• Temperature Control: It is recommended that the water temperature of the floor heating does not exceed 45℃ to prevent high temperatures from accelerating the aging of the floor slab materials.