Waterproofing Our Bathroom - Part 2

In previous article we discussed basic information about bathroom sealing. Now we know why to seal our bathroom and what the advantages of proper insulation are. No matter which method of sealing you choose, whether insulation mats or tanking liquid, insulation is more complex and does not rely only on these steps. This process is more complicated than it seems, and in this guide we will describe other individual steps in waterproofing shower space.


After properly installing the drain or showerlay, we can proceed to waterproofing the bathroom and the shower space. Before starting work, make sure you have all the necessary products, such as insulation mats or adhesives, and tools, ready for use and in adequate quantities. Start with removing oil stains, residues which could impair adhesion such as waterproof adhesive residues, cement paste and dirt very thoroughly. The substrate must be structurally sound, clean and able to bear weight.


At the beginning, we must prime the surface of the walls and floors. This process increases the resilience and adhesion of the substrate, thus providing better bonding to further insulating elements. Plus, priming significantly improves resistance to water, shock, frost and chemical damage.


Laying a concrete floor slab or floor screed over a fairly large area lends itself to a little inaccuracy simply because of the difficulty in moving and laying an extremely wet and heavy material like concrete. It is really hard to make it 100% level. Self levelling compound to get a concrete floor slab level depends on how much it is out of level in the first place. It can only be used if the floor is out of level by 5mm or less.


After our surface is clean and primed we can proceed to insulation. First, we cover large sections of floor surfaces and walls with insulating mats. Mats can be glued with flexible tile adhesive. When covering the walls with mats, it should be done carefully and attentively. Covering large areas with insulation mats ensures that the water that penetrates the tile joints will not get into more sensitive areas.


When the mats are already located, all the joints, both mats and various surfaces, should be sealed with specially prepared ISOL-ONE elements, including internal and external corners, sealing tapes and insulating drain membrane. We recommend sticking it with tanking liquid, which provides additional sealing, when the membranes will not secure sensitive water areas enough.


After all steps have been completed correctly, the surfaces, after drying, are ready for the finishing material - tiles, stone, etc. On the insulation layer we can use tile adhesive. Now your bathroom is completely sealed!

Alex D.

Expertise: Bathroom Finishing, Shower Installations, Plumbing

About Alex

Alex D. is a skilled installer with extensive experience in bathroom finishing and plumbing. Known for his meticulous work in creating custom walk-in showers and installing wet room shower trays, Alex brings both precision and creativity to every project. His hands-on expertise ensures that each bathroom he works on is not only visually appealing but also functionally superior.

Areas of Specialization

Walk-In Showers: Alex has a particular talent for designing and installing walk-in showers and wet room shower trays, transforming ordinary bathrooms into modern, accessible spaces.

Bathroom Plumbing: With a comprehensive understanding of bathroom plumbing systems, Alex ensures that all installations are executed flawlessly, resulting in durable and efficient setups.

Commitment to Quality

Dedicated to the highest standards of workmanship, Alex continually updates his skills to incorporate the latest techniques and materials in the industry, guaranteeing that each bathroom he works on is a testament to quality and craftsmanship.

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