How to do the basement of the cement board
Base repair: in the concrete roof and slab clean, the honeycomb and other large defects in the site of the plaster putty filled with steel scraper compaction, horizontal wiping scraping again (the surface can not scratch the top surface). (Concentration 5 = 100: 5 ~ 6: 60. Brush Alkaline aqueous solution: with 5μ degrees of caustic soda solution brush twice, if the use of 10μ "With the brush immediately rinse with water, dry and then under the next process.
Base treatment: cast-in-place concrete wall, due to floor, materials, release agents and other reasons, the wall flatness is poor, often stomata, honeycomb, Ma, yin and yang angle and drums and other phenomena, Department of ticking flat, concave to fill the fill. For the prefabricated concrete floor, slab base, must be hand brush with a wire again, the surface of floating sand, pimple, dust and other debris removed clean. For the cement mortar paper layer of gray surface requirements of the surface layer of dry, solid clean (no floating oil) can be.
Cement board can not be done directly on the basement membrane, should first put the putty to make the wall flat, and then paste the wallpaper the day before the brush base film, just wiped the concrete wall, can not scratch the putty. Because the water has not been completely dry, put on putty powder will cause cracking.
