There’s not a lot of correct information out there whether you can plaster over painted brick. Well, the answer is simple: yes, you can.
However, there could be a few factors that you need to consider first. If the paint is in good condition and there is no damage or cracks and peeling, then straight away, you may start the plastering process.
In case the paint is not in good condition or recently painted, it would be best to ignore the plaster over the paint. Because the paint is not in better condition, it needs repairing or professional work to strip the paint first.
Purpose of Plaster
Plastering is the process where plaster covers rough or uneven surfaces, and most often, it is used for walls and ceiling.
There are two primary purposes of plaster; first, it supports building structures like walls, bricks, or ceilings. Secondly, it gives a smooth surface and covers cracks or faults for renovation and decorative reasons.
Difference between Plastering and Skimming
Plastering and skimming are used to strengthen the walls and decorate the structures, but there is a difference between them. Skimming is used to renovate an old building, and skimmed surface areas are smooth.
On the other hand, plastering is used for a new building and plaster surface areas are always rough.
Skim Coat Over a Painted Walls
It is a fast and easy solution for repairing damaged walls and is usually used on existing plaster with a thin coat layer. Once you apply it to the brick wall and let it dry, you can paint, apply wallpaper, and decorate as you like. Usually, a skim coat is used to repair drywall.
Hiring Professional vs. DIY
You might be tempted to DIY plastering over paint. It is a very technical and complicated process, and it will be in your favor if professionals should do this work. The plaster process alone is very technical, so it will be an excellent option to hire professional plasterers.
They will use their skills, expertise, and technique during the renovation and will make sure no detail is missing. It means they will carefully apply the plaster application to be smooth and without bubbles, which could be an issue later.
You can relax because you know the plasterers will do the best job and ensure quality.
Plaster Thickness for Bricks
Recommended thickness for plaster is 12mm, 15mm, or 20mm. A 12mm cement plaster can be used where the bare surface of the brick is plastered. And 15mm cement plaster can be used on the 9” and 4.5” wall on the rough side.
Do You Need to Remove Paint Before Plastering?
It is not necessary to remove paint before plastering. It needs grout over the paint to form a key for the new plaster.
Plaster Onto the Brick
If you want to plaster the bricks, they will need to be cleaned off and prepared. You need to assess the condition of the brick wall and rectify where it is required. Because when you apply the new coat of plaster, it will not adhere to old and crumbling bricks.
Preparing When Paint Condition is Good
If you assess that your paint condition is good, you can plaster over it directly. Sometimes your walls can become dirty over time, especially in areas like kitchens. Kitchen walls could easily pick up grease from steam and cooking.
Cooking and steam are the reasons which covered kitchen walls with cooking oils and dust. There are many ways you can make it clean.
You may clean this with soapy water; take a bucket of warm water and dish soap, and now you can use a sponge or cleaning roller to wipe the walls.
Let the wall dry, and then your professional will start applying the priming PVA, which will help the plaster adhere firmly.
What to Do When the Paint is Not in Good Condition
In case your paint is not in a good condition, it does not mean all is lost. There are still many ways you can ready the brick walls so plaster can adhere to them. The primary step for preparing paint is to strip the cracked, peeled, or damaged paint.
If you don’t strip the damaged paint effectively, the plaster will not adhere perfectly to the brick walls, and you will not get your expected result. It’s better to work carefully on the primary step to avoid plaster risk that may not adhere to the brick walls.
This primary step is a highly exhausting and detailed process, and it’s better if you let a professional handle it.
How to Plaster Over a Brick
First, you need to prepare plaster either by hand or mechanically, pour a gallon of water and plaster powder in a construction bucket, and leave them for 5 minutes.
Now mix it well until it gets a creamy consistency. It would be best if you had a plaster trowel to spread it on the bricks.
You may load your trowel with plaster using a 4” palette knife. There is another option using a hawk, and both will work fine. It would be best to move in repetitive semicircular motions until you get the smooth and even coat on the surface.
Make sure you mix the material every 10 minutes and add water if necessary because the plaster dries quickly. As a general rule, the plaster application will not fall off the trowel if it has the right consistency.
Budget for Plastering Project
If you plan a plastering project in your home, you need to consider a few factors to work into your budget.
- How many rooms will you be plastering?
- Condition of painted bricks, and do they require paint removal first?
- Material costs
- The average rate of plasterers
- Are you planning to DIY or hire professionals?
Now you know how to plaster over painted bricks, but you also know that it needs time and planning. This work is exhausting and fairly complicated. It depends on you whether you take the DIY approach or hire professionals.