2. Incorrect proportion of yellow sand and cement will lead to cracking of cement paint layer. In this case, the putty layer needs to be removed first, and then the carbon fiber anti-crack cloth can be laid.
3. The putty layer is too thick or too thin, which causes the putty layer to crack. Generally, cracking will not be very serious. Just lay a glass fiber net directly on the cracked place, and then scrape the putty.
How to deal with cracks in the roof
When cracks appear in the roof, grooves of about 20 cm should be chiseled on both sides of the cracks, and then the mortar layer should be chiseled out and cleaned, and then polyurethane should be coated on the base surface for leveling.
Then spread the non-woven fabric on the roof, spread the polyurethane evenly, then add sand on it and repair them to a flat position with cement mortar, and then wait for them to solidify. If such cracks appear on the roof, they should be opened first, filled with elastic putty, and then reinforced with cement paint after drying.
What details should be paid attention to when repairing cracks?
1. Before repairing cracks, measure the cracks, and then select the appropriate repair method. If the crack is less than 0.2mm, it needs to be repaired before construction. The crack is 0.2-65438+/-0.5 mm, and joint sealant is needed for construction. If the gap is greater than 1.5mm, the pressure grouting method should be adopted.
2, in the repair work, if there is a slight slurry leakage phenomenon, it needs to be blocked with water glass or cement in time, but it will affect the overall quality. But under normal circumstances, there will be no similar situation, just take preventive measures.
3. When repairing cracks, the grouting pressure should be gradually increased, so as not to break through the weak parts of the sealing layer and lead to the need for re-sealing in the later stage. But also prone to short circuit, air can not be discharged by the way, resulting in insufficient internal slurry and bubbles.