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Can You Put Plaster Over Cracks/Cracked Walls/Ceiling? (How To)

Plaster is a traditional construction practice that is still effective to date. Plaster molding is durable, has soundproofing properties, and blends well with your property design to improve curb appeal. If your wall/ceiling has noticeable cracks, you’ve probably considered installing plaster molding for repair.

Can you put a plaster over cracks? Yes, you can. Plaster can be an effective solution to shrinkage cracks on walls when done well. You should apply plaster molding as soon as you notice the cracks because large cracks may need more than plaster.

Cracked cement walls

Wall/ceiling cracks are common and can appear in new and old homes. Plaster includes water, sand, and cement, which give it compressive strength and bonding to stick on the surface and fix the cracks.

However, plaster repair requires expertise if the ceilings are saggy and the walls are old. A thorough inspection must be done to identify the type of cracks and what type of plaster is to be used. Here is a guide to help you learn more about using plaster to repair cracks.

Should You Put Plaster Over Cracks/Cracked Walls/Ceiling?

Man putting plaster on the wall

You can repair minor cracks on walls/ceilings by removing the old plaster, cleaning the area, and applying new plaster. However, plaster is vulnerable to excess moisture and requires careful installation to avoid future cracks. This section discusses the main problems to look out for when using plaster over cracks.

Plaster may become brittle and more rigid when done poorly, resulting in possible surface cracking. Also, plaster requires more skills than drywall or any other repair method. Expertise and the right tools are required to deliver the best results on plaster repair.

Plaster is a long-lasting construction material but is prone to structural cracks. These cracks come in many shapes—diagonal, vertical, or horizontal, and may vary in shapes. Most plaster cracks appear when you don’t clean the ceiling or wall well. Any particles on the surface exert pressure on your newly installed plaster coat and may result in visible cracks after some time.

Bubbling is another problem to look out for when using plaster to repair cracks. Bubbling happens because of moisture (water damage). When water finds its way to the ceiling or wall surface, it results in mold and may cause bubbling. Avoid this issue by cleaning the surface under repair well and grouting the plaster surface well. Ensure no crack or opening would leak water beneath the plaster and cause bubbling.

Plaster is durable, but it may bulge. Bulging refers to moving away from the ceiling or wall, leaving a large space between the surface and the plaster. Bulging may happen even when the plaster has no cracks. Avoid this problem by firmly attaching plaster on the surface under repair.

What Tools Do You Need To Put Plaster Over Cracks/Cracked Walls/Ceiling?

Tools used for plaster

Having the right tools is a key step to ensuring the success of your plaster project. Thankfully, most tools needed for plaster repairs are easy to access, and you can rent if you don’t wish to buy them.

You will need a utility knife, drywall tape, a finishing trowel, window trowel, much bucket, and a mortar stand. You may also need a plastering float, mortar stand, and plaster coat (optional).

A utility knife is for shaping the existing crack to remove unwanted materials and shape it well as you start the repair. A drywall tape reinforces the joints, prevents water damage, and provides a rough surface so the plaster can stick well.

A finishing trowel helps you blade the plaster more effectively to bring a smooth surface. A window trowel works like a finishing towel, but it’s necessary when you are repairing near the windows or doors.

A mixing bucket allows you to mix water, sand, cement, and the other materials you will use for the plaster repair. The mortar stand may not be mandatory, but you use it to place your mixing bucket, so you don’t have to bend to the ground whenever you need to scoop your plaster mixture.

A plastering float gives your plaster that smooth, excellent finish when you are done. Lastly, you may apply a plaster coat to increase the plaster’s water resistance and increase the curb appeal of your newly plastered house. Ensure you get the right tools before starting the project to save time and avoid inconvenience.

What Preparations Do You Need To Put Plaster Over Cracks/Cracked Walls/Ceiling?

Man putting plaster on the wall

Plaster over cracks is a straightforward process but may get messy if you don’t prepare well. This section discusses the main preparation tips to remember as you start the process.

Gather the right tools and clean them. Clean the wall/ceiling and prepare the crack for the repair process. If the crack is huge, measure it to better estimate the plaster materials you need. Inspect the wall for any elements that may affect the quality of your plaster.

Start by getting the right tools to avoid unnecessary movements when doing your plaster. Ensure the tools are clean, too, because debris or buildup from a previous project may affect the stability of your plaster. Wipe all stains on your tools using a soft brush and keep your tools ready for the project.

Prepare the cracks(s) by removing debris, leaves, or twigs inside. If the crack is huge, measure its width and length to know how much sand and cement you will need for the plaster.

Lastly, inspect the wall for other elements threatening your plaster project. For instance, leakage from the gutters or roofs towards the crack may bring in moisture, and your plaster may not last if you don’t solve the moisture issue first. Inspection will also help identify other areas on the walls/ceiling that might need a plaster repair.

How to Put Plaster Over Cracks/Cracked Walls/Ceiling

Man putting plaster on the wall

Good plaster repair may make your house look strong and beautiful again. The plastering process requires expertise, but you can do it with the right tools. Here is a step-by-step process to put plaster over cracks in walls and ceiling.

Step 1: Use a utility knife to clean-line the crack. Ensure you can see all the parts of the crack and that no debris can interfere with the process.

Copyright protected content owner: and was initially posted on December 13, 2022.

Step 2: Apply drywall tape or PVA glue to hold your plaster well.

Step 3: Mix your plaster ingredients (water, cement, and sand), and stir the solution until it thickens. Ready plaster should be as thick and smooth as peanut butter.

Step 4: Carefully scoop your plaster from the mixing bucket and apply it gently on the crack. Spread your cement evenly to the wall/ceiling until the crack is already filled with plaster.

Step 5: Add coat (optional) after 24 hours when the plaster is dried. This optional step ensures your plaster is smooth and improves the appearance of the ceiling/wall.

Step 6: Clean the surrounding area with a soft cloth or vacuum, depending on the mess created.

Copyright article owner is for this article. This post was first published on December 13, 2022.

You can put plaster over cracks on ceilings or walls, provided you have the right tools. For the best results, consult an expert. Inspect the crack, gather the wanted tools and gently apply the plaster to the crack. Clean up and remember to monitor the area for any other structural damage.

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ReadyToDIY is the owner of this article. This post was published on December 13, 2022.

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