Construction Key Points:
1. Surface Cleaning. Remove residual dust, release agent oil stains, and other debris from concrete walls, as well as hollowed plaster areas, and carry out repairs. Fill all exterior openings securely. The surface flatness of the polystyrene board shall not exceed 4mm in deviation; for deviations beyond this, sand down protruding wall areas and make up for concave sections.
2. Wall measurement, leveling, and hanging lines. According to the architectural facade design and exterior wall thermal insulation technical requirements, level and vertical control lines, expansion lines, decorative joint lines, etc., are marked on the walls. Vertical reference lines are hung at large corners of the building's exterior wall and other necessary locations, with horizontal lines hung at appropriate positions on each floor to control the verticality and flatness of the expanded polystyrene board.
3. Apply mesh fabric over the exposed edges of the粘贴的聚苯板. Mesh fabric should be flipped over all exposed sides of the粘贴的聚苯板. Securely adhere a 200mm wide mesh fabric with 80mm wide sections using adhesive mortar to the base, then flip the remaining mesh fabric over when attaching the extruded polystyrene board later.
4. Paste polystyrene boards. Standard sizes for external insulation polystyrene boards are 600mm x 900mm and 600mm x 1200mm. Non-standard sizes or irregular areas can be cut on-site for the edges of entire wall sections, using polystyrene boards with a small size over 300mm. The joints of polystyrene boards should not be left at the corners of doors and windows. Due to the poor flatness of the base wall surface, it is advisable to use dot frame adhesive method. When the finish is a coating, the bonding area should not be less than 40%. Do not apply adhesive mortar on the side of the boards. Arrange the boards in horizontal order during installation, stagger the joints vertically, and do staggered treatment at the internal and external corners. Clean up the excess adhesive mortar from the edges of the boards promptly to ensure no "head mortar" between boards. The joints should be tightly sealed; use polystyrene strips of the appropriate thickness to fill joints wider than 2mm. The height difference in the joints should not exceed 1.5mm; otherwise, sandpaper or a grinding tool should be used to smooth it first.
5. Anchor fixation. When using mechanical anchors to secure extruded polystyrene boards, the installation of anchors should be at least 24 hours after the application of the bonding mortar. Drill holes into the EPS board surface with an electric hammer, the diameter of the holes should match the anchor diameter, and the penetration depth into the wall must not be less than 50mm. Screw or hammer in the anchor bolts, ensuring that the head and washer do not protrude above the board surface.
6. When the surface of the polystyrene board joints is uneven, coarse sandpaper lined with wood strips is required for priming. The sanding action should be gentle rotation in a circular direction, and then use a brush to remove the foam fragments from the surface of the polystyrene board.
7. Apply the base coat mortar, which is the first coat. After the polyurethane board installation and anchoring work are completed and inspected for quality, apply polymer mortar. Spread the base coat mortar on the polyurethane board surface while pressing the reinforcing mesh into the mortar. The reinforcing mesh for the door and window corners, as well as the concave and convex angles, is immediately pressed into the mortar.
8. Apply the mesh fabric. After stretching the mesh, affix it to the base mortar layer. Use a trowel to press the mesh into the mortar surface from the center outward, ensuring it is flat and compact; wrinkles are strictly prohibited. The mesh should not be pressed too deeply. When overlapping, the horizontal overlap must be at least 100mm and the vertical overlap at least 75mm.
9. Apply a finishing mortar coat over the mesh before the base mortar sets, ensuring it only covers the mesh and slightly reveals its outline. Avoid continually kneading the surface mortar to prevent the formation of hollows.
