What is Tanking? A Beginner’s Guide to Waterproofing Walls
If you’ve ever heard someone mention tanking and thought, “Wait, what on earth is that?” — don’t worry, you’re not alone. Tanking (also called waterproofing) is basically the process of keeping dampness out of your walls, floors, and ceilings — especially in basements and cellars.
Why is this a big deal? Well, with house prices on the rise, more people are turning to basement conversions as a clever way to create extra space without moving. A dry, waterproofed basement can be turned into almost anything: a cozy living room, a home office, a bathroom, a wine cellar… even a recording studio if you’re feeling creative. In commercial buildings, basements often double as storage rooms, bars, nightclubs, restaurants, or parking spaces. Once it’s waterproofed, the only limit is your imagination.
Which Tanking System Should You Choose?
Not all basements are created equal, so the “right” system really depends on your property and what you want to use the space for. Here are the main options explained in plain English:
1. Cementitious Waterproofing (aka the Vandex System)
This system uses a special waterproof slurry — think of it like a super-tough coating that gets applied to walls, floors, or ceilings. The Vandex BB75 powder is mixed with water, then sprayed or troweled on. Once it sets, it bonds with the masonry and creates a strong barrier that stops water from sneaking through. Simple, solid, and reliable.
2. Studded Membranes (aka the Oldroyd Xv Clear System)
If you’ve got an older property (Victorian houses in the UK are a classic example), this system is often the go-to. Instead of relying on the condition of the existing walls, a studded plastic membrane is fixed to them, creating a sealed surface.
From there, you can add plasterboard, a floating timber floor, or even screed on top. Since water still needs a way out, this system usually includes a sump and pump to drain away any moisture. For extra peace of mind, some people also add a drainage channel at the base of the walls.
3. Combination Systems
In many cases, the best solution is to mix and match. For example: use the studded membrane system on walls and floors, and the slurry system on the ceiling. It’s a belt-and-braces approach that gives you the best of both worlds.
Wrapping It Up
Tanking might not sound glamorous, but it can totally transform a damp, gloomy basement into a bright, usable space. Whether you want a home cinema, a guest room, or just some extra storage, waterproofing is the first step to making it happen. Think of it as unlocking hidden square footage in your home.
