Understand the reasons behind cracks in walls and the value of the correct cement admixture to prevent them. Learn if it is repair or replastering of cracked plaster that’s in question.

Cracked plaster is a common problem in both residential and commercial buildings. The presence of a small hairline crack doesn’t sound like a serious issue, but it can cause further repair issues, moisture infiltration, disfigurement, and even structural problems if left untreated. The real issue is whether a fix is possible or the entire plaster should be replaced in the future.

The answer is dependent on the condition of current plaster and, most importantly, the cause of cracking. Getting to the bottom of the problem can help save time, save money on repairs, and avoid having the same problem happen again.

Plaster crack is caused by a number of factors

Poor construction, environmental conditions and natural building movement are all common reasons for plaster cracks. Common causes include:

• Excessive water in the cement mixture.
• Sand that isn’t clean or has a high amount of silt.
• Incorrect mixing proportions
• Inadequate curing
• Temperature fluctuations
• Moisture penetration

Occasionally, plaster and masonry do not adhere well to one another. The natural settlement of the building is being considered.

Minor hairline cracks may only be cosmetic, but if the cracks are widening or reoccurring, the strength and adhesion of the plaster may have decreased. Just plugging the crack does not solve the problem; it is only temporary.

So, when is it appropriate to repair or replace cracked plaster?

If the plaster is structurally sound, it is often only necessary to repair the damaged area. Crack repair is typically recommended when:

• The cracks are thin and localised.
• The plaster around the space is securely attached.
• There are no signs of dampness or water seepage.
• There is no evidence of the crack developing with time.
• Damage is confined to a small area.

A good repair will make sure the materials are removed, the crack is thoroughly cleaned, a suitable repair material is used, it is allowed to cure properly and the surface is repainted. If done properly, the repair will give the wall a restored look and will minimize the extension of small cracks.

When Replastering is the Best Option?

When the damage is extensive and recurring, replastering is the better choice. It is generally recommended in the following scenarios:

• There are several crack lines on the wall.
• Plaster has a hollow sound when tapped.
• The plaster is separating from the masonry.
• The plaster behind is dampened.
• The repairs have been unsuccessful in the past.
• The original plastering was badly applied.

While replastering is more expensive initially, the end result is a more durable and attractive finish which can last for years, and will save on maintenance costs in the long term.

Why Surface Repairs Often Fail

A lot of people think that once a crack is filled it’s fixed forever. In fact, most crack fillers will just plug the cracks that are visible. If there is too much water, inferior materials, inadequate bonding or persistent moisture issues in the original plaster, the crack will probably reoccur.

For instance, a homeowner might have cracks in a wall of their bathroom, and continue to patch up the cracks over and over again, without knowing that the problem is the accumulation of moisture behind the wall. Repairs will be futile if the moisture source is not corrected and the damaged plaster is replaced.

That is why the experienced contractors pay more attention to fixing the root cause and not just covering the crack that is visible.

Cement additives are essential for producing quality concrete. BATTU Cement Additive helps prevent cracking during concrete making.

The best way to avoid cracks is to keep them from forming in the first place. BATTU Cement Additive is formulated to enhance the performance of cement based mixes in plastering, masonry and concrete works.

BATTU provides better bonding, better workability, lower water requirement and minimised shrinkage cracking, claims the manufacturer. It can be used with various types of cements, river sand, crushed sand, hand mixing and machine mixing, and can be used in a variety of construction projects.

The formulation itself is made with natural biopolymers and agricultural wastes, making it a much more environmentally friendly alternative to many petroleum-based construction chemicals.

Suppose a builder was filling a domestic flat in summertime. Rapid drying and shrinkage cracks are more likely to occur when temperatures are high. The contractor can thus achieve stronger, denser plaster with better adhesion and durability by applying a quality cement additive and adhering to good curing practices, which minimises the need for future repairs and enhances customer satisfaction.

Conclusion

Depending on the size of the area and the reason, a decision needs to be made whether to repair the cracked plaster or to replaster. If cracks are minor and not moving, they can often be fixed without needing to tear it out or replace the entire wall. If cracking is extensive or repetitive, it is generally necessary to completely replaster the wall in order to regain long-term strength and durability. Repairing the cracks visible on the surface without finding the underlying cause can result in continuing maintenance and waste of money.

The preferred solution is to avoid cracks altogether. Better materials, mixing, curing and dependable cement additives all help to produce stronger, more durable plaster. To assist in this preventive effort, BATTU Cement Additive enhances bonding, workability and performance of the plaster and reduces shrinkage-induced cracks. From new construction to renovation, it is a good investment to invest in high quality cement additives like Battu today to minimize maintenance costs and ensure a long-lasting solution in the future.