Inside Concrete Wall Blistering

Paint blisters or bubbles occur when the paint film lifts from the underlying surface.

Inside concrete wall blistering.

Moisture supports the growth of mold and causes wall coatings to blister and peel. Efflorescence is normal for new portland cement applications but the presence of efflorescence in older concrete usually belies an underlying moisture problem. Paint applied to concrete experiencing efflorescence will bubble and blister. Moisture blistering can be caused by the migration of water through an interior wall to the exterior thus pushing the paint off of the surface.

Brush a layer of concrete bonding adhesive over the scraped area. The adhesive will aid in binding the new plaster patch to the old plaster surface. The loss of adhesion between the paint film and surface is usually caused by heat moisture or a combination of both. Why does concrete blistering happen.

Concrete bister blisters are hollow low profile bumps on the concrete surface typically from the size of a dime up to 1 inch 25 mm but occasionally even 2 or 3 inches 50 75 mm in diameter. In commercial buildings the uncontrolled intrusion of moisture into concrete and masonry walls may have costly consequences. The air collects in spots under this airtight surface seal and creates blisters. Soaking the wall before using strong chemicals prevents the masonry from absorbing too much which can deteriorate the ingredients inside the concrete and lead to wall failure.

3 mm thick covers an underlying void that moves around under the surface during troweling. Wait for the adhesive to dry to the point where it loses it s wet look but remains sticky to the touch. Heat blistering caused by painting in direct sunlight on a surface that is too warm. It begins when either bleed water or bubbles of entrapped air move through the concrete and are unable to escape the surface.

Application of oil based or alkyd paint over a damp or wet surface. A dense troweled skin of mortar about 1 8 in. This condition eventually leads to peeling. Usually the surface was sealed too early during finishing resulting in the hidden voids of air and bleed water underneath the mortar skin.

When broken small pockets of white powder may ooze from the blisters. It can be corrected but the underlying cause of the problem must be addressed or it will recur.