Can Prefabricated Slab Houses Have Floor Heating?

Prefabricated slab houses can have floor heating, but careful evaluation and selection of the appropriate type are necessary, with dry-type floor heating being the top recommendation. Here is a detailed analysis:

1. Traditional cement-filled floor heating is not recommended
Prefabricated slab houses designed 30 years ago did not consider the load of floor heating. Traditional wet-type floor heating can weigh over 100 kg/m², potentially exceeding the load-bearing capacity of the floor slab (typically designed for 200-300 kg/m², but regular loads such as furniture and occupants must be deducted). Additionally, wet-type floor heating requires pouring a 5-8 cm cement layer, significantly reducing ceiling height. If the standard ceiling height of the house is less than 2.8 meters, installation may cause a sense of spatial oppression.

2. Dry-type floor heating is a viable option
Dry-type floor heating adopts a modular design, requiring no cement filling, with a thickness of only 2-4 cm and a weight of about 5 kg/m², exerting less pressure on the floor slab. Its construction period is short (3-5 days to complete), and it can achieve rapid heating through heat-conductive layers such as aluminum plates, making it suitable for renovations of old houses. However, note the following:

• Structural assessment: Before installation, a professional structural engineer must be commissioned to test the load-bearing capacity of the floor slab to confirm whether it meets the total weight requirements of the floor heating system (including pipes, filling layer, and floor decoration).
• Pipe selection: Prioritize the use of high-temperature-resistant and anti-aging pipes such as PE-RT or PB. The bending radius must comply with regulations (usually 6-8 times the pipe diameter) to avoid pipe wall damage due to excessive bending.
• Expansion joint setting: Set expansion joints every 4-6 meters (the specific spacing needs to be adjusted according to the house span) to prevent ground cracking due to thermal expansion and contraction.
• Pressure testing: After installation, a pressure test must be conducted (e.g., maintaining a pressure of 0.8 MPa for 24 hours without leakage) to ensure pipe sealing.

3. Alternative heating suggestions
If the floor slab load-bearing capacity or ceiling height does not meet requirements, consider the following heating methods:

• Exposed radiators: No ground renovation is required, and installation is convenient, but they occupy wall space and have a slower heating speed.
• Air conditioning heating: Suitable for short-term use, but long-term operation consumes high energy and results in dry air and poor comfort.
• Electric heating films/carbon crystal plates: They are thin (about 1 cm) and lightweight, but attention must be paid to circuit load and local overheating risks.

Summary: The installation of floor heating in prefabricated slab houses must prioritize structural safety, with dry-type floor heating being the preferred choice and strict adherence to construction specifications. If conditions are limited, alternative heating methods with minimal impact on the building should be selected.