Why Do Tiles Come Loose From Thinset? - How To Mosaic Blog

Recently, artist Jackye Mills emailed me about a problem she was having with her first mosaic project, and it really caused me a lot of angst because the artwork was a strong design that was otherwise well executed. I hated the thought that a first-time mosaicist could do such a good job on something so ambitious only to lose the project due to a technical issue.

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Problem

The problem was that the tiles were popping out of the thinset mortar that she used to attach them.

Diagnosis

Since Jackye lives in a desert climate and said that she had done the work out in the sun, it was obvious to me that the problem was due to the thinset drying out before it could cure. REMEMBER: Cement products such as grout and thinset mortar are made from portland cement, which hardens by bonding water at the molecular level, NOT by drying out. If you let grout or thinset dry out as they are trying to harden, they simply won&#;t harden very well, and then they will be crumbly and not adhere well to surfaces. I don&#;t ever tile with mortar in direct sunlight if I can help it and will rig tarps if needed to minimize the effects of sun and wind. I also run humidifiers if I am working in a dry climate, including indoor climates with strong AC or heat running.

BUT, drying out during hardening isn&#;t the only reason why thinset might fail to bond securely to glass mosaic tile.

An Alternate Cause of Failure

While grout and thinset failures are almost always due to drying out while hardening, another potential explanation for poor adhesion is oil or dust on the tile. Sheets of stained glass are cut to size by being scored with a Pistol-Grip Cutter, and these cutters use Cutting Oil, which can contaminate the surface of the glass. For this reason, we recommend that sheets of stained glass be rinsed with detergent before being cut into pieces with a Mosaic Glass Cutter.

From the detail photograph of the missing tiles, we can see that the missing tiles had embossed patterns on their bottom sides. This indicates that they were molded tiles and not pieces of stained glass. The conclusion is that the failure was in the thinset itself (due to drying) and not an oil film on pieces of stained glass.

Solutions

One solution to the problems in this particular project would be to rub your hand firmly over the surface encouraging any potentially loose tiles to go ahead and pop off, and then you could individually remount these with thinset mortar.

However, if many of the tiles started coming loose, then my solution would be to cover the mosaic with Mosaic Mounting Tape and then scrape it off the backer with a putty knife or paint scraper. Then the mosaic could be remounted.

If only some of the tiles came loose by rubbing, I would reattach them individually as first recommended, and then I would &#;grout&#; the mosaic with thinset mortar, which comes in gray and white and can be dyed by mixing with concrete dye. The reason I would use thinset for my &#;grout&#; is that if any tiles came loose during grouting, I could reattach them. Also, the adhesive properties of the thinset would help ensure that any tiles close to failure were reinforced.

I would work gently and not try to clean the mosaic off too much while the thinset was still hardening.

Mosaic tiles are a popular choice for pools these days. They&#;re stylish, unique and usually easy to maintain. Mosaic tiles are also very durable, making them a practical choice for most pools. That said, pool owners sometimes experience issues with mosaic tiles.

Common questions involving mosaic tiles include: How do you fix a loose mosaic tile? Why are my mosaic tiles falling off?

Below, we provide answers to those questions and more. Read on for all the information you need on taking care of your mosaic tiles.

Why are my mosaic tiles falling off?

Over time, almost any type of tile can start slipping off the side of your pool. This could be due to improper installation, subpar adhesives and a variety of other issues. If you&#;ve noticed mosaic tiles getting loose or starting to fall off, it&#;s important to fix them right away.

How do you fix a loose mosaic tile?

Fixing a loose mosaic tile can be relatively easy if you have experience. You first have to remove the loose tile as well as the grout stuck to its sides. Then check for any cracks left behind in the open space, and fill those with hydraulic cement. Reapply the tile with a thin-set mortar, and wait for it to dry.

While this process is simple for someone with experience, it&#;s easy for others to make a mistake that could affect the integrity of your pool. That&#;s why it&#;s always best to work with an expert in pool repairs.

Problems during installation

You don&#;t want uneven tiles or lines affecting the look of your entire pool, which is why it&#;s important to leave installation to the professionals. While it might be tempting to try and save some money by installing mosaic tiles yourself, this is almost never a good idea. Installing mosaic tiles is often difficult and time-consuming if you don&#;t have experience. You could save yourself time, energy and the need for expensive repairs by hiring a pool expert in the first place.

Tiles damaged during delivery

An issue some experience when investing in mosaic tiles is tiles damaged during delivery. Tiles damaged during delivery can be a major inconvenience&#;even if the delivery company agrees to cover the cost of replacing said tiles. You&#;ll end up having to wait longer to start tiling your pool, which can be a major issue for those with tight schedules. That&#;s why it&#;s important to use a delivery company you trust.

Work with the right pool tiling company

Working with a reputable pool contractor can help prevent all the mosaic tile issues mentioned above. Be sure to only work with a company that has plenty of experience in installing and maintaining pool tiles.

When you&#;re not sure why your pool&#;s mosaic tiles are falling off, don&#;t let those improperly-installed mosaic tiles ruin your new pool. Let the experts at Can Do Plaster Crew take care of all your pool repair needs. Contact us today for an estimate on your service needs.

Categorised in: Pool Tile Repair

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