Material Requirements for Prefabricated Wooden Houses

The materials for prefabricated wooden houses must meet the following requirements:

I. Main Load-Bearing Structural Materials

1. Structural Timber: Prioritize the use of coniferous wood with a density of ≥0.65g/cm³ (such as North American SPF spruce-pine-fir) or hardwood. Engineered wood such as Scots pine from Northern Europe must comply with the GB/T 50329 standard.
2. Glued Laminated Timber Components: The bonding strength of the laminated layers must be ≥8MPa, meeting the requirements of GB/T 26899 to ensure structural stability.
3. Preservative Treatment: The preservative retention must meet the requirements of GB/T 22102 to prevent wood decay and extend service life.

II. Functional Materials for the Envelope System

1. Thermal Insulation Layer: Select rock wool or glass wool products with a thermal conductivity of ≤0.045W/(m·k) to enhance the house's thermal insulation performance.
2. Waterproof and Breathable Membrane: Must comply with the GB/T 17638 standard, with a water vapor transmission rate of ≥800g/㎡·24h to balance indoor and outdoor humidity.
3. Fire Protection Treatment: Use intumescent fire-retardant coatings with a combustion performance rating of B1 to reduce fire risk.

III. Decorative and Finishing Materials

1. Interior and Exterior Wall Finishes: Recommend CCA-treated western red cedar cladding for both aesthetic appeal and durability.
2. Window and Door Systems: Prioritize the use of thermally broken aluminum-wood composite profiles with a heat transfer coefficient (K-value) of ≤2.0W/(㎡·k) to improve energy efficiency.
3. Flooring Installation: It is advisable to use 18mm thick multi-layer solid wood composite flooring with a moisture content controlled between 8%-12% to prevent deformation and cracking.

IV. Construction Auxiliary Materials

1. Metal Connectors: Select 304 stainless steel with a tensile strength of ≥520MPa to ensure reliable connections.
2. Structural Adhesives: Must pass the ASTM D2559 test standard to guarantee structural bonding strength.
3. Water-Based Wood Finishes: The VOC content must comply with the limits specified in GB 24410 to reduce indoor air pollution.

V. Materials for Special Environmental Conditions

1. High Humidity Areas: Add a 0.2mm thick polyethylene film moisture barrier to prevent moisture penetration.
2. Seismic Zone Buildings: Use specialized seismic metal connectors to enhance structural seismic performance.
3. Severe Cold Regions: Equip windows and doors with Low-E insulated glass to reduce heat transfer and improve thermal insulation.

Material selection should consider climatic conditions, structural design, and environmental standards. Prioritize the use of FSC-certified sustainable forestry products and ensure that all materials come with complete quality certification documents.