Putty powder falling off is a common quality problem in construction projects, which will affect the appearance and service life of the building. To prevent the problem of putty powder falling off, it is necessary to start from multiple aspects such as material selection, construction technology and maintenance management.
1. Choose high-quality putty powder
Material quality
Choose putty powder that meets the standards: Purchase products that meet national standards (such as GB/T 9779-2005 “Building Interior Wall Putty” and JG/T 157-2009 “Building Exterior Wall Putty”) to ensure that its bonding strength, compressive strength and other indicators are qualified.
Ingredient inspection: High-quality putty powder usually contains a suitable proportion of glue powder and cellulose ether, which can enhance the bonding strength and crack resistance of putty. Avoid using putty powder containing inferior fillers or too much stone powder, which are easy to cause powder falling off.
Manufacturer selection
Brand reputation: Choose a manufacturer with good reputation and word of mouth to ensure the stability and consistency of putty powder.
Technical support: Some manufacturers provide technical support and construction guidance, which can help better solve problems in construction.
2. Optimize construction technology
Surface treatment
Surface cleaning: Make sure the surface is clean before construction, without dust, oil and other pollutants, otherwise it will affect the adhesion between putty and the surface.
Surface moistening: For surfaces with strong water absorption (such as concrete walls), they should be properly moistened before construction to prevent the surface from absorbing moisture in the putty too quickly, resulting in a decrease in adhesion.
Construction conditions
Environmental temperature and humidity: Avoid construction at too high or too low temperatures, the best temperature is 5℃~35℃. Excessive humidity (relative humidity exceeding 85%) is also not conducive to the drying of putty, and construction should be carried out in suitable weather.
Layer control: Putty construction should be carried out in layers, and the thickness of each layer should not exceed 1-2 mm. Ensure that each layer of putty is fully dried before the next layer is constructed.
Construction method
Stir evenly: Putty powder should be mixed with water in proportion and stirred until uniform to avoid particles or lumps. The stirring time is generally about 5 minutes to ensure full fusion of the materials.
Smooth scraping: Putty should be scraped evenly to avoid cracking and powdering caused by uneven local thickness. Use moderate force during construction to avoid scraping too thin or too thick.
3. Reasonable maintenance managemen.
Drying time
Suitable drying: After the putty construction is completed, the drying time should be reasonably controlled according to environmental conditions to avoid drying too fast or too slow. Under normal circumstances, it takes about 48 hours for putty to dry, and strong sunlight and strong winds should be avoided during this period.
Surface treatment
Sandpaper polishing: After the putty is dry, use fine sandpaper (320 mesh or more) to gently polish it to make the surface flat and smooth, and avoid excessive force to cause surface powdering.
Subsequent construction
Paint brushing: After the putty is polished, the topcoat or paint should be applied in time to protect the putty layer. The paint should be compatible with the putty to avoid subsequent problems caused by material mismatch.
4. Common problems and treatment
Powder shedding
Local repair: For areas where powder has fallen, you can re-apply putty after local grinding to ensure that the base is clean and take appropriate maintenance measures.
Comprehensive inspection: If large-scale powder shedding occurs, the construction and base surface of the putty should be checked, and the cause should be fully treated after it is found out, and re-construction should be carried out if necessary.
Preventing regeneration problems
Process improvement: Summarize the causes of powder shedding problems and improve construction processes, such as adjusting the ratio of putty and improving the mixing method.
Training construction personnel: Strengthen the training of construction personnel, improve the construction process level and quality awareness, and reduce powder shedding problems caused by improper operation.
To prevent the problem of putty powder shedding in construction projects, it is necessary to comprehensively consider multiple aspects such as material selection, construction process, environmental control, and maintenance management. Selecting high-quality putty powder, strictly following the construction specifications, and doing a good job of subsequent maintenance management are the key to ensuring the quality of putty and construction effect. Only by striving for excellence in every link can we effectively avoid powder shedding problems and ensure the beauty and durability of buildings.