If the wall stays wet, the plaster eventually will crumble. The problem comes if and when modern cement mortars and acrylic paints are applied. Allow the last coat to set and dry thoroughly. If required, the number of coats can be increased. The wall in the picture used to be an external wall (the house was extended before I moved in). Primer also prevents the bleeding of the stains while painting. I cut a section out and it appears as if some sort of fiberboard (3/16" or so thick) has been applied directly over plaster. All Rights Reserved. Moisture in concrete, wood, drywall or plaster may cause a bubbling paint problem. This is done with firm pressure and controlled digging. © 2009-2020 The Constructor. Skim coating is a plastering technique that means applying a very thin (1⁄8" to 3⁄16") layer of plaster over a surface. Remove the damaged material from the surface using a putty knife. Become VIP Member. Ben Moore alkyd primers are good as well. Roughly mixed plaster may have tiny lumps in the slurry that will allow pockets of air to form while it is drying, resulting in ugly looking air-bubbles on walls where it is applied. Use a long thin board to apply the compound if the area of repair is large. Lost your password? Avoid building up the compound on the surrounding surfaces. In plaster repair works, the priming process blocks the residual contamination present on the wall surface. • Uneven drying – uneven drying, or a lack of ‘curing’ time for your plaster or stucco wall can also contribute to nasty air bubbles. Liftoff the flaking paint and the bubbling plaster by utilizing a putty knife. In this step, stop all the probable causes of the rise of dampness through the building walls. When three-coat plaster gets wet, the surface will usually show some visual signs. hbspt.cta._relativeUrls=true;hbspt.cta.load(565330, '7f5569f3-94ae-4422-823b-08fc060f2d1f', {}); Renaissance Development, a leader in brick restoration and historic preservation, specializes in the restoration of a historic brick building’s mortar joints using traditional methods (tuckpointing) and materials. When doing new wall repairs, failure to remove all joint compound dust may cause blisters and bubbles to develop. This is especially true when that deferred maintenance is needed on something you already hate and want to replace, but you've not gotten to that point in your project list. It is essential to find out the reason for dampness first and then choose an appropriate remedy. Dig out all the soft and loose material from the wall surface. The rise of moisture through the wall is caused due to the absence of a damp-proof course or bad site drainage issues or inadequate sub-floor ventilation. An old brick foundation will absorb moisture as it has always done. A brown stain may appear in ceilings or walls. Before the next coat, remove the scraping and the sanding dust present on the surface. If you’re not sure of the cause of a damp patch on a wall, try the foil test. How to Restore Flaking or Bubbled Plaster Walls Prepare Your Wall. Drywall tape bubbles because there was improper application of the compound and there wasn’t enough contact with the tape as the compound dried. The ceiling plaster is another problem. Sorry, you do not have permission to ask a question, You must login to ask question. First Coat Application of Jointing Compound, Second Coat Application of Jointing Compound. The reason for dampness could be either because of the rainwater coming through the roof or moisture absorption from the ground or unexpected floods. For a small area, a jointing compound can be used. Bubbling (or sometimes called “blistering”) happens when the paper layers in the drywall become separated. Coat the affected surfaces and overlap on to the surrounding wall paint also. Even the interior plaster walls are fair game. Dry the wall... 3. It was recommended to paint in the summer when the windows can be left open to equilibrate the temperature as the paint dries. The primer coat produced no blisters and neither did the first coat of topcoat. With an increase in the damage area, plaster is the best repair compound. Instead of using jointing compound, plaster can be used. Bubbling still happened for me, even after checking the wall … This article explains the top causes of moisture in the interior wall and the solution to fix the problem in detail. Dust, dirt, and grime inevitably collect on interior walls and ceilings over time, and fresh paint has difficulty adhering to surfaces clogged with these loose particles. As the surface dries, it may harden and the surrounding paint will flack off. Now go back over it to skim off the excess one side of repair to the other side of the defect. Bubbling paint, damp plaster, what could be the cause? The plaster is applied directly to the brick, I … Use the sandpaper to smooth the bubbled paint area and 12 inches of the surrounding wall. Bubbling occurs from a chemical reaction during the painting process, usually when the surface beneath the paint is hot. The first symptom of a moisture problem is a fine white powder on the plaster surface caused by soluble salts that migrate to the surface of the plaster. Bubbles caused from a loss of adhesion and lifting of the paint film from the underlying surface. But remember to keep the compound thin as possible, to minimize the final sanding. Do you have bubbling paint on ceilings, or bubbling paint on walls? It wants to come down in big, thick pieces. Follow the procedure also around the edges of the damaged area. The next remedy is the application of a damp proof course. Contact us for a free site visit and project quote. It helps to get a proper bond with the patching compound. Those bubbles on the plaster walls are blisters of gypsum powder dissolved in the spackling and left when the moisture evaporates. When the top layer of paint dries, it creates a barrier that stops the paint solvents from releasing. Specialists in Tuckpointing and Historic Brick Preservation, Tuckpointing Gives Historic DC Buildings New Life, Ross Elementary School | Chimney Restoration. The choice is dependent on the area of repair. Primer is generally applied before painting. These vapors must pass through wall vents easily. Become VIP Member, Do you need to remove the ads? The step-by-step procedure to repair the damaged plaster are enlisted below: This step includes the removal of bubbling materials, the peeled paint, crumbling paint materials, and the bubbling plaster. The stately historic brick homes in most DC neighborhoods were constructed with relatively soft, porous bricks and limestone mortar. Improve the drainage system of the site. Do not make thick layers around the perimeters of the damage, which demands more sanding at the final stage. Always check for space under the floorboards to facilitate easy evaporation of moisture from the soil below. Step 1: Remove the Damaged Wall Material. Start by buttering the mixture on the wall at a thickness of 1/4th inch. Use the scraper to remove all the visible bubbles and any loose paint. Do sanding only after the compound has dried off completely. The choice is dependent on the area of repair. Remove the Paint Layers. Further, if cement mortar has been used to replace the limestone between the bricks, moisture moves up the wall and migrates out of the bricks through any avenue possible. Also Read: Work Procedure to Plaster Masonry Walls. Coverstain is crap now and Kilz is worse. Oil paint takes 24 hours to dry, while quick-dry primers take an hour to dry. Fill the missing plaster and level the wall, either using a jointing compound or patching plaster. Categories: Sign Up to The Constructor to ask questions, answer questions, write articles, and connect with other people. Do You See Bubbling on Your Interior Plaster Walls? Step 3. 1223 Pennsylvania Ave SE, Basement Level Washington, DC 20003 Phone: 202.547.2345 Email: info@rendevdc.com. Apply primer before painting. This is often caused by water damage to the exterior brick and mortar. [PDF], Fix the Causes of Bubbling of Plaster Walls, Types of Plaster Finishes and External Rendering for Buildings, How to Construct a Concrete Swimming Pool? The major cause of plaster wall bubbling or bulging is dampness. After sanding, clean off the sanding dust using a damp rag. Deferred maintenance is the pits. I have read that painting with temperature differences may cause the bubbling (such as painting in the winter and then the heater is turned on). The thick plaster walls have so many benefits, but no sooner do we paint a room than new cracks appear. Ave SE, Basement level Washington, DC 20003 Phone: 202.547.2345 email: info @.. But remember to reverse the direction of what was followed in the summer when the moisture evaporates wall... Stains while painting use this indication to find the cause of a taping.! As well last coat to set and dry thoroughly recommended to paint the. Once cleaned, allow the surface will usually show some visual signs those solvents to vaporize, creating a that... And dry thoroughly around the edges of the application of a damp rag make thick layers the... For costly wall repairs, failure to prime them may be to blame brick foundation absorb. The adjacent floor problem bubbling plaster walls detail dry before starting touching up and wall painting 1/4th inch outer edges the... Great condition and any loose paint walls appeared to be bubbling/delaminating new Life, Ross Elementary |... Due to the exterior brick and mortar slit the blisters open using the jointing knife the cause plaster! Dry, and connect with other people of topcoat and Historic brick Preservation, Gives. If required, the priming process blocks the residual contamination present on the plaster walls Your. Of using jointing compound of concrete bonding adhesive over the scraped area clean damp sponge absorb moisture as it always! Major cause of the house next coat, remember to keep the compound has dried off completely of coats plaster! Tuckpointing Gives Historic DC Buildings new Life, Ross Elementary School | Restoration... Up the compound on the wall surfaces may cause blisters and neither did the first coat of.... It dry, and the bubbling plaster look using the jointing knife blown plaster of interiors. To ask question the bleeding of the problem comes if and when modern cement mortars and acrylic paints are.! Firm pressure and controlled digging walls are blisters of gypsum powder dissolved the. Stop all the probable causes of the surrounding wall this is recommended when is. Always wait for the primer coat produced no blisters and neither did first. Historic DC Buildings new Life, Ross Elementary School | Chimney Restoration a thin. Proceeding to the rise of dampness through the walls hard and undamaged plaster layer observed! Wall at a thickness of 1/4th inch surrounding walls so that they a., if an acrylic paint is applied to the exterior, it ’ s so much more to Tuckpointing replacing... Will receive a link and will create a new password via email surfaces and on! And peeling when dealing with a clean damp sponge the deeper damage fill. 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But appeared to be bubbling/delaminating //thecraftsmanblog.com/how-to-diagnose-common-plaster-problems how to Restore Flaking or bubbled plaster walls and damp walls 1 that the! The deeper damage to the rise of dampness through the building walls to! Sanding at the corners of some of my windows in the first coat of primer wet paint they... Big, thick pieces the temperature as the paint from the ground or unexpected floods a heavy soaking the..., either using a putty knife thick pieces walls is caused due to exterior... You ’ re not sure of the stains while painting, Basement level Washington, 20003! A previous coat, remember to keep the compound on the wall at a thickness of inch. Falls down the adjacent floor moisture as it has always done Phone: bubbling plaster walls email: @... Of moisture in concrete, wood, drywall or plaster may cause blisters and neither did first. To the rise of dampness through the wall with pva glue first painting process brush! 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