What Causes A Cracked Putty Layer?

Theoretical dosage: 0.8 to 1 kg/m2 (batch waste thickness 0.5mm to 1mm, one time) Dry putty dosage = theoretical dosage x batch putty area batch putty area = room floor area x (2.5 to 3).

Why should the construction temperature be above 5°C when puttingty is scraped?

The dissolution of organic additives in the putty requires a certain temperature. A low construction temperature will result in a slow dissolution of the putty additives and will not completely dissolve, which will affect the construction performance and the quality of the later paint film, resulting in a waste of additives.

Why should the thickness of the putty be controlled between 1mm and 1.5mm?

The one-off scraping thickness of the putty is directly proportional to the curing shrinkage strength, which increases in proportion to the tendency of the putty to crack. As the thickness of the putty increases, the curing shrinkage strength increases and the propensity to crack increases. Therefore, a scraping thickness of less than 1mm effectively reduces the curing shrinkage strength and prevents the putty from cracking.

However, if the scraping thickness is too thin, the putty layer will lose water too quickly and cause chalking. Therefore, a scraping thickness is required. More than 1 mm. If the thickness of a single batch is greater than 1.5mm, a coarse levelling putty may be used.

HPMC For Wall Putty/Plaster     

Why should the wall be clear and free of plaster before puttingty?

Plastering is actually the process of bonding the putty to the wall. The bond is firm and solid and the putty does not crack during the curing process. If there is floating ash or a loose wall, the putty layer will not be firmly bonded to the wall. In an environment where the putty sets or changes in temperature and humidity during the four seasons, the putty will contract and expand indefinitely and repeatedly, and displacement will occur. Sliding leads to cracking of the putty.

Why should I stir the putty and leave it for a few minutes before mixing?

It takes time for the various organic additives in the putty to dissolve in water. If they are not completely dissolved, this can affect the performance of the work and the quality of the paint film at a later stage, resulting in a waste of additives.

How is the cracking of the putty layer caused? What should I do?

There are many reasons for putty cracking. There are external causes and internal causes. Externally, dry shrinkage cracks are formed by dry and wet changes; temperature cracks are caused by temperature changes and thermal expansion and contraction; structural cracks are caused by static loads of wall structure deformation. Internally, factors such as product quality, construction techniques (batch thickness, interface treatment) and maintenance methods can all lead to cracking of the putty.

Solution.

Micro-cracks caused by wet and dry, temperature changes or batch scraping: can be sanded, brushed, cured and carefully controlled.

Large cracks caused by thick scraping, etc., shovelled out, wall fixed and puttyed again.

Large cracks caused by cracked walls, after painting, painting the wall, applying mesh and then scraping putty. If the wall cracks are large, the wall crack treatment programme should be dealt with.

If you want to know more information about the HPMC for Wall Putty/Plaster, welcome to contact us today or request a quote.