Leo Martínez
Laying thinset concrete overlay over painted concrete is possible but not recommended, as the tile attachment is only as strong as the bond of the paint to the concrete. If the paint comes loose, the tile will too. To prepare for tiling, the paint must be removed by sanding, blasting, power washing, or using paint strippers. If the paint is stuck to the block, you can tile over it with a polymer-fortified thinset. However, it is important to prime the surface first, as thinset is sticky and challenging to skim coat.
Can you lay thinset concrete overlay over painted concrete?
| Characteristics | Values |
|---|---|
| Possibility | Yes, it is possible to lay thinset concrete overlay over painted concrete. |
| Effectiveness | The adhesive may not always be reliable, and the paint may need to be removed first. |
| Preparation | The paint must be fully cured, then roughed-up (abraded) to help the bond. |
| Paint Removal Methods | Sanding, power washing, paint strippers, soda blasting, grinding, or resurfacing. |
| Adhesive | A highly modified thinset should be used. |
| Paint Type | Epoxy-based paint requires an epoxy adhesive, while latex-based paint requires a latex-based thinset adhesive. |
| Drying Time | Thinset should not freeze for at least a week after application, more if larger tiles are used. |
| Water Absorption | The concrete floor should readily absorb water for better bonding. |
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What You'll Learn
- Thinset can be applied over painted concrete, but it is not recommended
- The paint must be fully cured, then roughed up to help the bond
- If the paint adhesion is good, tiles can be applied directly
- Tiles can be applied over painted concrete with a polymer-fortified thinset
- Removing paint with soda blasting is effective, safe, and environmentally friendly
Thinset can be applied over painted concrete, but it is not recommended
Before applying thinset over painted concrete, it is important to determine what type of paint is on the surface. For example, an epoxy-based paint requires an epoxy adhesive to bond to it, while a latex-based thin-set adhesive should be used over latex-based paint. Only use epoxy and latex thin-set products that state they can be used for bonding tile to paint.
Additionally, the paint must be fully cured and then roughed up or abraded to help the bond. It is also recommended to give the paint a few weeks to cure before tiling over it. If the paint adhesion is good, the tile should be fine.
However, it is generally advised to remove the paint and scarify the surface to open up the pores of the concrete before applying thinset. This can be done through mechanical means such as sanding, power washing, paint strippers, soda blasting, or grinding. Water should be readily absorbed into the concrete as an indication that it is suitable for bonding.
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The paint must be fully cured, then roughed up to help the bond
While it is possible to lay thinset concrete overlay over painted concrete, it is not always recommended. If the paint is not fully cured, it may not bond properly with the thinset, causing the tile to come loose. Thus, it is important to give the paint a few weeks to cure before applying the thinset.
Once the paint is cured, it is advisable to roughen the surface to improve the bond. This can be done through various methods, including sanding, power washing, paint stripping, or soda blasting. Soda blasting, in particular, is a safe, effective, and environmentally friendly way to remove paint. It involves blasting the concrete with granular sodium bicarbonate (baking soda) at high pressure, quickly stripping away the paint without damaging the underlying concrete.
Another important consideration is the type of paint used. If the paint is epoxy-based, an epoxy adhesive is required for bonding. For latex-based paint, a latex-based thin-set adhesive should be used. It is essential to ensure that the thinset and adhesive products are specifically designed for bonding tile to paint.
Additionally, the concrete should be prepared properly before applying the thinset. This includes fixing any cracks, uneven spots, or other damage. The concrete should also be able to absorb water readily, indicating its suitability for bonding. Overall, while it is possible to lay thinset over painted concrete, careful preparation and the use of appropriate materials are crucial for a successful bond.
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If the paint adhesion is good, tiles can be applied directly
To test the strength of the paint adhesion, you can try the water absorption test. This involves checking if water is readily absorbed into the concrete through the paint. If water is absorbed, it indicates that the concrete is suitable for bonding tiles.
If you choose to apply tiles directly over painted concrete, it is important to determine the type of paint used. For instance, an epoxy-based paint requires an epoxy adhesive, while a latex-based thin-set adhesive should be used over latex-based paint. Ensure that the products you use state they are suitable for bonding tiles to paint.
Additionally, if you are tiling a wall, it is important to ensure that it is smooth and flat. If the wall is perfectly flat, a mastic adhesive could be used, but thinset is generally recommended as it provides better coverage and is easier to clean up.
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Tiles can be applied over painted concrete with a polymer-fortified thinset
While it is possible to lay tiles over painted concrete, it is not always recommended due to the risk of the tiles not adhering properly. If the paint comes loose, the tiles will as well.
To ensure proper adhesion, the paint must be removed through mechanical means such as sanding, power washing, paint strippers, soda blasting, or grinding. This process can be time-consuming and labour-intensive, and it may be necessary to try multiple methods to completely remove the paint.
However, if you are determined to tile over painted concrete without removing the paint, it is essential to use a polymer-fortified thinset. Examples of this type of thinset include Mapie Ecoprime and Custom's Versabond. Before applying the thinset, it is important to ensure that the paint is fully cured and then roughened to help the bond. Additionally, the thinset should not freeze for at least a week after application.
It is also crucial to consider the size of the tiles. Smaller tiles are recommended when tiling over painted concrete, as they allow for better escape of the thinset's water vapour. Large tiles may require a slightly modified thinset that is less dependent on drying to attain its strength.
In conclusion, while it is possible to tile over painted concrete using a polymer-fortified thinset, it is important to follow the necessary steps to ensure proper adhesion and avoid issues with tiles popping off.
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Removing paint with soda blasting is effective, safe, and environmentally friendly
It is generally not recommended to lay tile over painted concrete. If the paint comes loose, so does the tile. Therefore, it is important to remove the paint before laying tile. While there are a few ways to remove paint, such as using a grinder, soda blasting is an effective, safe, and environmentally friendly alternative.
Soda blasting is a cleaning method that uses a form of baking soda (sodium bicarbonate) instead of other non-environmentally friendly, hazardous blasting media like sand. It is a safer method of abrasive blasting, posing almost no chance of harming the substrate. This is because soda particles completely shatter into dust after striking and removing the paint, without affecting the base metal or fiberglass. Soda blasting is also non-toxic to all humans and animals, and as it is mixed with water, there is very little risk of heat or chemical-related damage.
Soda blasting is a highly effective method for removing paint. By using the largest diameter nozzle that can be supported by your air compressor, you can accomplish the task quickly. Blasting at a pressure of 80 to 100 psi is very effective in removing most types of paint and coatings.
Soda blasting is also a great way to prevent the spread of rust on your project. It leaves a light, dusty protective film on panels, which can be easily rinsed away with water before painting. This film helps prevent surface rust for several months.
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Frequently asked questions
Yes, you can lay thinset over painted concrete, but it is not recommended. The thinset may not stick properly, and you may need to do extra prep work.
To prepare painted concrete for a thinset overlay, you must first remove the paint. This can be done through mechanical means such as sanding, power washing, paint stripping, soda blasting, or grinding. Once the paint is removed, you can grind down any high spots and use a patching mortar to flatten or level the surface.
If the paint is oil-based, you can use any highly modified thinset. If the paint is epoxy-based, use an epoxy adhesive. For latex-based paint, use a latex-based thinset.
If you are using a thinset overlay on painted concrete, you should allow the paint to fully cure before applying the thinset. Give the paint a few weeks to cure, and then roughen the surface to help the thinset bond.
While it is possible to bond thinset to painted concrete without removing the paint, it is not recommended. The strength of the bond will depend on the adhesion of the paint to the concrete. If the paint comes loose, the thinset will as well.
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