Inside Concrete Wall Blistering

It also saturates insulation reducing energy efficiency.

Inside concrete wall blistering.

Paint applied to concrete experiencing efflorescence will bubble and blister. The loss of adhesion between the paint film and surface is usually caused by heat moisture or a combination of both. In commercial buildings the uncontrolled intrusion of moisture into concrete and masonry walls may have costly consequences. It begins when either bleed water or bubbles of entrapped air move through the concrete and are unable to escape the surface.

Why does concrete blistering happen. Application of oil based or alkyd paint over a damp or wet surface. It can be corrected but the underlying cause of the problem must be addressed or it will recur. Usually the surface was sealed too early during finishing resulting in the hidden voids of air and bleed water underneath the mortar skin.

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. A dense troweled skin of mortar about 1 8 in. 3 mm thick covers an underlying void that moves around under the surface during troweling. 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.

Blistering occurs when air gets trapped in the concrete and can t break out of the seal that may be created during finishing operations or caused by a rapidly setting surface. Brush a layer of concrete bonding adhesive over the scraped area. Heat blistering caused by painting in direct sunlight on a surface that is too warm. The adhesive will aid in binding the new plaster patch to the old plaster surface.

Efflorescence is normal for new portland cement applications but the presence of efflorescence in older concrete usually belies an underlying moisture problem. When broken small pockets of white powder may ooze from the blisters. Exposure of latex paint film to dew high humidity moisture or rain shortly after paint has dried especially if there was inadequate surface preparation and or poor ventilation in areas such as. This condition eventually leads to peeling.

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. Moisture supports the growth of mold and causes wall coatings to blister and peel.