Points to Note During Putty Application
Release Time:
2015-09-25
Source:
Points to Note During Putty Application
1. Dry powder Putty powder How do you calculate the consumption and quantity required for renovation?
Theoretical consumption: 1 kg per square meter (for a skim coat thickness of 0.5 mm to 1 mm, applied in two coats); dry-powder putty consumption = theoretical consumption × skimming area; skimming area = residential floor area × (3.5 to 4).
2. Why must the application temperature be above 5°C when applying putty?
The dissolution of organic additives in putty requires a specific temperature; when the ambient temperature during application is low, the dissolution rate of these additives is extremely slow, resulting in incomplete dissolution. This can adversely affect both the workability during application and the quality of the final film formation, leading to unnecessary waste of the additives.
3. Why should the putty application thickness be controlled between 0.5 mm and 1 mm?
The single-pass application thickness of putty is directly proportional to its cured shrinkage strength, and an increase in shrinkage strength is correspondingly associated with a greater tendency for cracking. As the putty thickness increases, both the cured shrinkage strength and the likelihood of cracking rise. Therefore, applying the putty at a thickness of less than 1 mm can effectively reduce the cured shrinkage strength and help prevent cracking. Cracking may occur; however, if the skim coat is applied too thinly, the putty layer will lose moisture too rapidly, leading to chalking. Therefore, the skim coat thickness should be greater than 0.5 mm.
4. Why is it necessary to clean the wall surface thoroughly and remove all loose dust before applying putty?
Applying and troweling putty is, in essence, the process of bonding the putty to the wall surface. When the bond is strong and durable, the putty will not crack during curing. However, if there is loose dust or a porous wall surface, the putty layer will fail to adhere firmly and securely to the wall; as a result, during the curing process or under the influence of seasonal fluctuations in temperature and humidity, the putty will undergo… Continuous, cyclical contraction and expansion, coupled with displacement and slippage, lead to cracking of the putty.
5. Why is putty required to be stirred, allowed to stand for several minutes, and then stirred again before use?
Various organic additives in putty require a certain amount of time to dissolve in water; insufficient dissolution can compromise application performance and the quality of the final film, leading to additive waste.
