How To Expertly Seal A Shower Tray

Has your sealant seen better days? Years of use or poor application can lead to sealant pealing or wearing away and allowing for leaks to happen, it is important to get this fixed as soon as possible to prevent expensive damage and damp occurring. Or perhaps you’ve just installed a new shower or bath and need to seal it? Well before you do anything, read our tips on how to expertly seal a shower tray or bath from the mastic man specialist, The Mastic Guys.

Remove ALL the Existing Sealant

Before you do anything, ensure that any existing sealant is completely removed, and we mean completely. Simply cutting away at the sealant may not remove all of it, so check by rubbing your thinking to see if there is any remaining residue. If there is, use a Stanley blade to scrape this off.

One of the most important things to remember when applying sealant is that while it is tempting to take shortcuts, you’ll pay for it in the end, so preparation is key and it’s best to spend the time to perfect it. If a job’s worth doing, do it properly!

When new mastic is applied, it should look like new to allow for maximum adhesion, so don’t be tempted to put new mastic over old as this won’t prevent leaks as the issue will lie with that base layer as your protection.

Check your Grout

Before applying, you should also check the grout lines have no cracks in them and the grout is clean, the grout lines should go down as far as the tile ends so you can get a clean line with sealant and connect it all together seamlessly.

If there are cracks, this can let water in, leading to leaks. To deal with cracks in your grout, remove the affected grout and replace.

Cracks can appear in your grout if it hasn’t been mixed properly or there are too many additives in it, allowing for air pockets as it dries, making it brittle.

Is the Shower Tray Secure?

Another important step to take is to ensure the shower tray is solid, you can check this by standing in it. There should be zero movement, you should not feel or see it sink down. The same goes for a bath, so ignore the advice of filling a bath or shower tray with water while waiting for mastic to dry. The best way to prevent this movement which can create gaps in your mastic, is by providing support underneath your shower or bath such as a timber support to prevent weight causing sag on your shower tray.

Check for Gaps

You should also ensure that the gap between the tray and the bottom edge of the tile is no more than 3mm; you can use a tape measure to check this. Trying to seal larger gaps can require further work and gaps larger these may mean your shower tray or tiles were not fitted correctly to begin with and therefore mean other parts are not fitted correctly such as the shower screen or your support for the tray. To fill these larger gaps, bridge them with plastic trims and then seal them.

Want to Call in A Professional Mastic Man?

If you want to ensure your mastic is applied professionally, to a high standard and will stand the test of time, you need to book a mastic man. At The Mastic Guys, we provide a two year guarantee on our work, so you can feel confident your mastic will stand the test of time and if it doesn’t, we’ll fix it free of charge!

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