Key points of external wall insulation construction
After the primary wall is qualified, the insulation layer construction can be carried out. The specific construction technology is as follows: cleaning and leveling the base → hanging the control line → installing and looking for the cornice of the flat-bottomed pallet → preparing the materials and tools → preparing the bonding mortar → pasting the folded grid cloth → pasting the benzene board → checking and leveling → filling the board joints → polishing and leveling → installing decorative lines (making benzene boards) or framing joints → nailing and anchoring → acceptance of the insulation layer.
1. Key construction points of pasting polystyrene board. Free paper reference network. Paste the turnover net: paste the turnover net on the following parts, sealed and waterproof. Around doors and windows openings, reserved openings, parapets, footstools, balconies, awnings, etc. Base, deformation joints and junctions with different structures and materials. The above part is called the system terminal. It is required that the rolled grid cloth be pressed into both sides of polystyrene board at least100 mm.
Point-and-frame Fa Tie polystyrene board: evenly spread the mixed slurry around the polystyrene board with a trowel, and evenly spread a number of grey cakes on the blank, then align the polystyrene board at a predetermined position and flatten it, and check the verticality and flatness at any time, so that the polystyrene board and the base material can be firmly and smoothly bonded together. After screeding, the mortar width around the polystyrene board is about 60mm, the narrowest part is not less than 60mm, the ash cake diameter is not less than 100mm, the thickness is 5mm, and the bonding area is not less than 30% of the polystyrene board area. Free paper reference network.
Flat-fell seam and detail requirements: polystyrene board should be pasted from bottom to top, with staggered joints and biting corners. Each layer of staggered joints 1/2 plate length is not less than 200mm. If the gap between plates is greater than 2mm due to the deviation of blanking size, the polystyrene plate should be cut into appropriate blocks and stuffed into the gap. The polystyrene boards at the four corners of the doors and windows should be cut and formed as a whole, and no splicing is allowed. The joint is not less than 200mm away from the corner of the hole. After the polystyrene board is pasted, let it stand for 24 hours, and the uneven joints of the board should be polished with sandpaper before the next process. After the polystyrene board is firmly pasted, install the anchor. According to the required position, drill holes with impact drill, and the anchoring depth is not less than 25mm.
2. Protective layer construction requirements. Use a trowel to evenly coat the mixed mortar on the surface of polystyrene board. Press the pre-cut grid cloth into the plastering mortar at the aligned position with a trowel, and plaster it line by line to avoid folding the grid cloth. Grid cloth is laid horizontally, line by line from top to bottom, and laid in turn along the corner of the external wall; If it is an opening for windows and doors, stick a piece of 45 with a length of 300mm and a width of 200mm at the corner of the opening. Diagonal grid cloth. Steel mesh should be laid in the following parts: the ground floor is 2 meters away from the outdoor ground; Parts that may be subjected to impact force. Laying method of steel mesh cloth: first paste the steel mesh, then paste the standard mesh, and a layer of plastering mortar must be added between the steel mesh and the standard mesh. Grid cloth overlap: standard grid cloth overlap width ≥≥100 mm; ; Steel grid cloth shall not overlap and bend, and the grid edges shall be butted. The grid cloth at the corner should be laid continuously, and the package width should be ≥ 200 mm. Tickle joint treatment: on the surface where continuous construction is not possible, grid cloth with overlapping width ≥ 100mm should be reserved outside plastering mortar, and attention should be paid to keeping the grid cloth flat and clean for subsequent construction. Leveling and surface treatment: level the mortar with a trowel.
3. Precautions. First, each frame unit must be constructed at one time. It is forbidden to meet in one carriage. Secondly, when the construction is near the edge of the frame, it needs to be carefully treated. Don't put the newly applied mortar on the adjacent boards. When polishing, avoid secondary polishing of the finished plate. Paper reference network. The joint position of the third water distribution grid is not less than 0.3m from the height of each scaffold. Fourth, the construction of the fence should take sun-shading and wind-proof measures. Avoid rain erosion within 24 hours after the final construction is completed.
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