What Is The Cause Of Blistering In Plastering?

What Is The Cause Of Blistering In Plastering?

What Is The Cause Of Blistering In Plastering?

Blistering in plastering is caused by moisture rising up to the surface of the masonry, and coming into contact with the plaster covering it. As this happens, the plaster reacts and bubbles up, lifting away from the brickwork as a result.

This occurs due to poor insulation of the wall or if too much water has been used in the mix of plaster.

Other potential causes include hydrophilic salts in existing sand and cement render or an excess of moisture caused by new construction techniques such as open-jointed tiling.

How Do You Get Rid Of Blisters On A Plaster?

To effectively get rid of blisters on plaster, the primary cause of moisture intrusion must be identified and resolved. Once this is done, the affected plaster must be removed and replaced with a patch.

This method helps avoid further damage as well as prevent future blistering. To ensure good adhesion and quality results, it is best to use pressure-sensitive tape on the back side of the patch to adhere it in place.

The edges should then be feathered with joint compound for a smooth finish before painting over or wallpapering onto the patched area.

What Are The Main Plaster Defects?

The main plaster defects include blistering of the plastered surface, cracks, efflorescence, flaking, peeling, popping, and uneven surfaces as well as the softness of the plaster.

Blistering occurs when air or water is trapped between layers of plaster and causes bubbles to form on the surface. Cracks occur due to shrinkage, too much pressure, or improper application of materials and may appear in both horizontal and vertical lines.

Efflorescence is a result of moisture that builds up in the plaster causing it to become discolored or stained. Flaking and peeling happen when the paint or top coat fails to adhere properly to the surface due to a lack of preparation or improper type/amount of primer being used.

Popping occurs when air pockets form under the plaster resulting in small dots on its surface. Finally, softness in plaster can occur due to poor mix quality which makes it difficult for the material to support itself once applied on wall surfaces.

What Causes Flaking In Plastering?

Moisture is the most common cause of flaking in plastering. When moisture comes in contact with the plaster, it causes soluble salts to move to the surface, which creates a fine white powder on the surface – this is usually the first sign that there is a problem.

If left unchecked, this moisture problem can lead to further deterioration of the plaster and ultimately result in it crumbling and needing to be replaced.

In order to prevent this from happening, any areas where water may enter should be sealed properly, and any existing moisture problems should be addressed immediately.

What Is The Best Treatment For Blisters?

The best treatment for blisters is to allow the fluid inside to drain and gently wash the area with mild soap and water.

Then, cover the blister and the area around it with a dry, sterile dressing to protect it from infection until it heals.


Hydrocolloid dressings, available over the counter from pharmacies, can help prevent discomfort and encourage healing of the blister.

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