Construction Drawings for Insulation Layer of Prefabricated Houses

Currently, we cannot directly provide the 'construction drawings for the insulation layer of prefabricated houses,' but we can explain the key points of insulation layer construction and the construction process based on specifications and construction experience:

I. Key Points of Roof Insulation Layer Construction

The roof insulation should be continuous with the exterior wall insulation layer to avoid structural thermal bridges. During construction, a waterproof layer should be installed on the side close to the outdoors and extended into the top cover of the parapet wall to prevent rainwater infiltration. A vapor barrier should be added between the structural layer and the insulation layer to prevent water vapor condensation from affecting the insulation effect. The exhaust construction should comply with the requirements of the 'Technical Code for Roof Engineering' GB-50345, and exhaust ducts or vents should be set up to discharge water vapor from the insulation layer and prevent the performance degradation of insulation materials due to humidity changes.

II. Construction Process for Exterior Wall External Insulation

Taking expanded polystyrene (EPS) boards as an example, the construction process includes:

1. Base Layer Treatment: Clean the dust and oil stains on the wall surface, repair cracks, and ensure the base layer is flat and dry.
2. Measurement and Layout: According to the design requirements, snap horizontal control lines and vertical grid lines to determine the粘贴 (pasting) positions of the insulation boards.
3. Pasting EPS Boards: Use the dot-and-frame method or the strip-adhesion method to paste the EPS boards onto the base layer. The board joints should be staggered to avoid continuous joints.
4. Grinding and Repair: Grind the joints of the EPS boards to ensure a flat surface and repair local defects with adhesive mortar.
5. Applying Surface Adhesive Mortar and Laying Mesh Fabric: Apply the anti-crack surface adhesive mortar in layers, with each layer not exceeding 2mm in thickness, and lay alkali-resistant fiberglass mesh fabric to enhance the anti-crack performance.
6. Surface Layer Treatment: Apply water-resistant elastic putty and then carry out the surface layer coating or tile construction to complete the exterior wall decoration.

III. Advantages of Inverted Roof Construction

An inverted roof consists of an insulation layer, a waterproof layer, and a structural layer from top to bottom. It uses hydrophobic insulation materials (such as extruded polystyrene boards) and adds a reinforced concrete or pebble covering layer. Its advantages include:

• Simplified Construction: The waterproof layer is located below the insulation layer, avoiding direct exposure to ultraviolet rays and extending its service life.
• Stable Moisture Resistance: Hydrophobic insulation materials have low water absorption rates, reducing deformation caused by humidity changes.
• Convenient Maintenance: The covering layer protects the insulation layer and reduces the risk of mechanical damage.

IV. Selection of Insulation Layer Materials and Construction Techniques

The materials should meet requirements such as high compressive strength, good durability, and low thermal conductivity. Common materials include Portland cement, polyurethane foam, polystyrene foam, and mineral wool. During construction, attention should be paid to:

• Base Layer Treatment: Ensure the base layer is flat, dry, and free of oil stains and dust.
• Material Cutting and Jointing: Cut the insulation materials according to the design dimensions and use staggered or overlapping joints at the splicing points to avoid thermal bridges.
• Laying Sequence Control: Lay the materials from bottom to top or from one end to the other to ensure neat arrangement.
• Fixing and Connection: Use adhesion, anchoring, or mechanical fixing methods to ensure a firm connection between the insulation layer and the base layer.

For specific illustrations, it is recommended to refer to the above text descriptions, consult the 'Architectural Construction Atlas,' or contact the design unit to obtain targeted drawings.