Insulation Layer for Rural Prefabricated Houses

Common materials for the insulation layer of rural prefabricated houses include EPS insulation boards, XPS insulation boards, rock wool boards, and polystyrene foam insulation boards (benzene boards). Construction should select appropriate methods based on material characteristics and pay attention to thickness control.

Roof Insulation Material Selection

The insulation layer for prefabricated concrete roofs needs to balance insulation and moisture resistance. Common materials include:

• EPS Insulation Board (Polystyrene Foam Board): Its closed-cell structure provides good insulation, with a low thermal conductivity that effectively reduces heat transfer. Its moisture resistance is achieved by adding moisture-proof agents or covering with a moisture-proof layer, making it suitable for dry or moderately humid rural areas.
• XPS Insulation Board (Extruded Polystyrene Board): It has a higher density and better compressive strength than EPS boards, with a closed-cell rate close to 100%, offering superior moisture resistance. It is suitable for roofs with high humidity or those requiring load-bearing capacity.
• Rock Wool Board: Made from basalt, it has Class A fire resistance and also provides sound absorption and noise reduction. Its thermal conductivity is slightly higher than the previous two, but its fire resistance makes it the preferred material for areas with high safety requirements.

Wall Insulation Construction Methods

For self-built rural houses, external insulation is commonly used for walls. Taking polystyrene foam insulation boards (benzene boards) as an example:

1. Fixing Process: First, use cement to adhere 10 cm-thick benzene boards to the wall, then reinforce with expansion bolts to ensure tight bonding between the board and the base layer.
2. Waterproofing Treatment: Fix a mesh on the surface of the benzene board, apply a cement plaster mixed with a waterproofing agent (about 0.5 cm thick), and finally paint with a waterproof coating to form a multi-layer moisture barrier, preventing rainwater penetration that could compromise the insulation layer.

Insulation Layer Thickness Control

The insulation layer is not necessarily thicker the better; performance and cost need to be balanced:

• Risks of Excessive Thickness: Increases material costs and construction difficulty, may add excessive weight to the structure, leading to increased load and even wall cracking.
• Reasonable Thickness: The thickness of the roof insulation layer should be determined based on the material's thermal conductivity and local climate. For example, EPS boards are recommended to be 5-10 cm thick in cold regions; a 10 cm thickness of benzene boards for walls can meet the energy-saving needs of most rural areas.

Summary

The design of the insulation layer for rural prefabricated houses should consider material characteristics, construction techniques, and actual needs. Priority should be given to materials that balance insulation and moisture resistance, with strict control over construction details and avoidance of盲目 (blindly) increasing thickness to achieve a balance between economy and practicality.