Jul 9, 2021
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Can you use Venetian plaster in a shower?

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When it comes to renovating your bathroom, there are countless options and styles that you can roll with, but what about Venetian plaster? Will it be suitable for a shower wall or not? Let’s find out!

Can I apply plaster to my shower walls?

Absolutely you can. With smooth lime-based plasters such as Venetian, Marmorino, Tadelakt, and Pastellone, you can indeed apply them in your shower walls. That being said, coarse plasters cannot be applied in the shower area as they will retain organic residue thus leading to mould.

Can Venetian Plaster by applied to shower walls?

Indeed, it can. You can apply a medium or coarse type of Venetian plaster to your shower walls. However, you’ll want to be thorough with a professional application in order to prevent damp spots and mould from spoiling it.

What is the best type of waterproof treatment for plasters being applied to showers?

Arguably the most effective waterproofing solution is using a polyurethane varnish. First, you must apply two coats of a universal primer (dilated 1:14 with water). Next, you should apply at least two to three coast of your polyurethane varnish (e.g., PU1C or PU2C)—this will create a perfectly impermeable finish keeping the aesthetic aspect of your plaster finish intact.

Can plaster be applied to a shower tray?

This is not recommended. Applying plaster finished to a shower tray can be done, but you must take extreme care when you are preparing the area of the drainpipe so that it can be properly sealed. You should seek professional assistance if this is something that you would like to do.

Can you apply plaster over existing tiles?

In some cases, you may wish to plaster your bathroom walls over existing tiles. If this is the cast then you will first need to fill in all of the gaps and create a smooth, flat, and uniformed surface. Using a non-shrinking adherent substrate plaster is the ideal approach for this.

I’d like to apply lime plasters inside my shower by myself, how would I go about it?

Here is a step by step guide on how to apply plaster to your shower walls:

Step 1 – Waterproof your faucet handles

First up, you need to apply silicone behind the faucet handle rings once it is fixed to the wall. Applying silicone in the upper arch of the ring is sufficient.

Step 2 – Apply plaster over a waterproof membrane

If you have a waterproofing membrane, then you must apply your first coat of a fibre-reinforced plaster to the surface of the shower-box. Following that, one it has dred, you can then apply a polyster or fibreglass mesh on your tap and faucet handles. Once fixed to the surface using the same fibre-reinforced plaster, you can then apply the same mesh again to the entire shower all, fixing it with your fibrous plaster coating.

Step 3 – (If applying plaster over tiles)

If you wish to plaster over your existing tiles, rather than spend ages trying to rip them off the wall, first you need to fill in all of the gaps. Once you have a smooth and flat surface, you’re good to go. In order to do this, you should use a non-shrinking adherent substrate plaster—it will get the job done great.

Step 4 – Apply your desired plaster finish (i.e., Venetian Plaster)

Now you can simply directly apply your Venetian plaster to the shower box walls. Just make sure that you use a smooth plaster as coarse plasters love retaining organic residue and developing mould.

Step 5 – Waterproof your shower walls

In order to waterproof your shower walls, you’re going to need to do two things: First apply several coast of universal primer (diluted 1:14 with water). Following that, you can apply at least two to three coats of a highly quality polyurethane varnish.

Step 6 – Applying silicone on the shower tray for sealing

Next, apply an anti-mould silicone on the seal at the bottom of the shower walls and on the shower tray itself.

The Takeaway

If you are feeling a little overwhelmed and you aren’t sure if you are up to taking on this task by yourself, then you can always hire in the professionals to assist you. However, if money is an issue, then read through these steps very carefully, take your time, and you shouldn’t run into much trouble. Good luck!

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