Construction technology of polyurethane external wall insulation board

Polyurethane external wall insulation board is also the most commonly used material in decoration industry, and it is also widely used. For example, color steel sandwich panels, central air conditioners, building wall materials, cold storage, cold storage, incubators, chemical tanks and other fields are all adapting to polyurethane insulation boards. Polyurethane insulation board has the characteristics of various specifications, strong bearing capacity, fine foam, uniform cells and high compressive strength. Then Bian Xiao will tell you about polyurethane insulation board.

Construction technology of polyurethane external wall insulation board

1, primary treatment

Should clean the wall, remove oil, remove floating ash, etc. Loose and weathered parts of old walls should be removed. The flatness of the wall should be controlled below 3 mm, and the deviation at the grass-roots level is too large, so it should be leveled with mortar.

2, hanging vertical, elastic control line

Under the top wall and bottom wall, use expansion bolts as hanging points for hanging wires on the big wall. High-rise buildings use theodolite to hang wires, and multi-storey buildings use large wires to hang thin wires. The tightening device is used to tighten the steel vertical line at the large yin and yang angle of the wall. The distance between the steel vertical line and the wall is the total thickness of the insulation layer. After hanging up the line, first check the flatness of the wall with a 2m ruler, and then check the verticality of the wall with a 2m line supporting plate. Only when the flatness requirements are met can the construction begin.

3. Paste the prefabricated insulation board.

At the corner of yin and yang or at the door window, paste the prefabricated insulation board to the standard thickness. Used for doors and windows, corners of decorative lines, parapet edges, etc. , with prefabricated insulation board paste along the edge. Where the wall width is less than 900mm, it is not suitable for spraying construction, and polyurethane prefabricated parts with corresponding specifications and sizes can be directly pasted.

When pasting, use a trowel or a grey knife to smear the prepared adhesive slurry along the periphery of the prefabricated part of the insulation board, with a width of about 50mm and a thickness of 3-5 mm, and then evenly arrange 4-6 points in the middle of the prefabricated part, with a total gluing area of not less than 30% of the prefabricated part of the insulation board. Require firm bonding, no cock, fall off phenomenon.

4, doors and windows and other parts of the block

After the insulation board prefabricated parts are bonded, before spraying rigid foam polyurethane, shielding work should be fully done. Doors and windows are generally covered with plastic sheets, which are cut into pieces with the same area as the doors and windows. For shelf tube, wrought iron and other irregular parts that need to be protected, they should be wrapped with plastic film for protection.

5, brushing interface agent

Use spray gun or roller brush to spray interface agent evenly, without bottoming out.

6, spraying rigid foam polyurethane insulation layer

Start the polyurethane spraying machine to spray hard polyurethane evenly on the wall. When the thickness reaches about 10mm, insert thickness markers every 300mm, with plum blossom distribution, and the density per square meter should be controlled at 9 ~ 10. Then continue spraying until it is flush with the column (the stigma is faintly visible). Construction spraying can be completed in several times, and the thickness of each time should be controlled within10 mm.

7. Trim the rigid foam polyurethane insulation layer

After spraying for 20 minutes, use paper cutter, hand saw and other tools to clean and trim the sheltered part and the protruding part beyond the total thickness of the insulation layer.

8. Spray polyurethane interface mortar

After finishing spraying polyurethane insulation layer for 4 hours, evenly spray polyurethane interface mortar on the surface of rigid foam polyurethane insulation layer with spray bucket or roller brush.

9, rubber powder polystyrene particle size

Leveling with polystyrene particle mortar should be carried out twice, and the interval between each time should be greater than 24 hours. Plastering mortar should be dense, and the thickness should not exceed10 mm. Apply the mortar for the second time to meet the flatness requirements, and check whether it meets the acceptance criteria with a line ruler. Specific practices are as follows:

1)? Before plastering, use 2m aluminum alloy ruler to check the flatness of rubber powder polystyrene particle mortar. After plastering and finishing for the first time, the wall flatness basically meets the requirement of 5 mm

2)? The second plastering thickness of rubber powder polystyrene particle mortar is 15mm, and then leveled with a ruler, and the concave part is repaired and leveled with a trowel; After leveling the surface layer for 2-3 hours, wipe the wall surface with a trowel, and check the flatness/verticality of the wall surface with 2m guiding feet and supporting feet. Flatness/verticality should be controlled within 2mm.

10, anti-crack mortar layer

Apply anti-crack mortar and spread alkali-resistant grid cloth.

The length of alkali-resistant grid cloth is about 3m, and the size is pre-cut. Anti-crack mortar is generally completed in two times, with a total thickness of about 3 ~ 5 mm After plastering the anti-crack mortar with an area equivalent to that of the grid cloth, immediately press the alkali-resistant grid cloth with an iron trowel. The lap width between alkali-resistant grilles should not be less than 50 mm, immediately press the alkali-resistant grilles with an iron trowel from left to right and from top to bottom, and it is forbidden to build by laying bricks or stones. Angle of Yin and Yang should also be stubble lap, lap width ≥ 150mm, should ensure the founder and verticality of Angle of Yin and Yang. Anti-crack mortar should contain alkali-resistant grid cloth, and the shop should be flat and wrinkle-free, and the grid can be seen faintly. Mortar plumpness reaches 100%. Where it is not full, it shall be plastered with anti-crack mortar for the second time, leveled and compacted.

After the construction of anti-crack mortar is completed, check whether it is flat, vertical and square, and repair the mortar that does not meet the requirements. It is forbidden to wipe ordinary cement mortar waist line and window cover line on this surface.

Polyurethane insulation board is still very commonly used in our life, and its appearance greatly facilitates our life. Polyurethane insulation board has high compressive strength and can withstand great pressure in the process of manufacturing finished products. Good weather resistance, convenient installation, stable quality, high production efficiency, wide width, light weight, thin wall, excellent corrosion resistance and high heat preservation efficiency, so many industries are now using polyurethane insulation board. For example, factories are used the most. Moreover, the comprehensive cost performance of polyurethane insulation board is also very good.

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