This happens because they struggle to dry in the corners, in the lower parts, and in general in an environment with little air circulation such as the shower. Likewise, lime plasters suitable for exterior surfaces also tend to deteriorate in a shower area. Indeed, you may not only get stains provoked by a prolonged stay of damp, but also molds caused by the deposits of organic material coming from skin and soaps. Choose the right final treatment for your plasterįirst of all, you must waterproof the shower walls, but also make them easily washable. Furthermore, you must take extra care in protecting those areas where water drops hide or dry slower. Unless, of course, you know how to choose the right waterproofing treatment for your finish. As we have said, the accumulation of damp inside a shower will rapidly cause marks and molds to appear and to permanently damage your plaster. Waterproofing is the second most important step in the application of stuccos in shower boxes. Waterproof the shower surface and its critical points On the contrary, if there are neither waterproofing membranes nor tiles, you can directly apply your plaster finish over a first layer of Universal Primer. Just clean the tiles to remove the greasy substances before applying it. Moreover, since it is very adherent, you can use it as a substrate layer on very smooth surfaces, such as marble or tiles, without the need of sanding them first. This plaster has an extreme adhesion capacity and doesn’t shrink when it dries off. In this case, you should cover the tiled wall with a non-shrinking, adherent substrate plaster, such as the Gap leveling plaster (GLP). Yet, the majority of substrate plasters tend to shrink when the water contained in them dries off, leaving the gaps unfilled. In other words, you want to fill the gaps between the tiles to create a uniform, flat surface. When you apply stucco on a tiled shower wall, you must prepare a leveled, gripping substrate first. Sometimes, you may want to apply plaster over old tiles in a bathroom or shower walls. Finally, when the third and last coat is dry, you can directly apply your stucco on the shower box walls. When this second coat is dry, apply once again the same mesh to the entire shower wall, fixing it with the fibrous plaster. Once dry, apply a polyester or fiberglass mesh (180 gr per square meter) on the tap and faucet handles area, and fix it to the surface using the same fiber-reinforced plaster. The simplest solution to this issue is to apply a first coat of fiber-reinforced plaster all over the shower-box surface (such as our AntiCrack enriched with the Strong Adhesion Agent SAA). Furthermore, if the plaster coat is not strong enough, cracks can eventually occur all along the walls. As a result of this pressure, the plaster around the handles cracks and breaks. When fixing the handles, a ring is screwed into the wall exercising strong pressure against it. This is because every shower box has a weak point: the faucet handles. Moreover, covering it with a coat of a fibrous adhesive plaster before applying the stucco is not enough to prevent its cracking. Plasters are too thin to be applied to such a soft surface, and will surely crack if applied directly on it. However, these membranes are designed for tiling, not for plaster finishes. This membrane is often a rubbery and flexible finish. Applying a plaster to a waterproofing membraneįirst of all, in some countries, it is mandatory to cover the shower’s substrate with a waterproofing membrane. This will prevent the stucco from cracking. If you want to apply stuccos to the shower’s walls, it is crucial to prepare a resistant yet flexible plaster substrate. Prepare a resistant plaster substrate for the shower In this post, we share with you the techniques to achieve durable and flawless plaster finishes inside showers, step by step. Yet, after years of plaster application in showers and steam baths, we have found the solutions to all the main challenges. Consequently, when you apply natural lime-based plasters to shower walls, they rapidly develop irreversible wet marks and molds. However, shower stalls are subject to daily water flows and low air circulation, which leads to the accumulation of damp. Marmorino Venetian Plaster, Tadelakt and Pastellone are all examples of elegant, eco-friendly finishes that can be used in shower boxes. The application of natural lime-based plasters inside showers can easily transform an ordinary bathroom into a high-end, luxurious environment.
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