Bathroom Renovations That Last: Waterproofing, Layout and Material Choices

A bathroom is the densest room in a house: plumbing, electrical, ventilation, tile and waterproofing all in a few square metres. It is also the room where poor workmanship surfaces fastest.

Waterproofing is the whole job

Everything else is finish. Behind the tile, a shower needs a continuous waterproof membrane over a properly sloped base, sealed corners and seams, and the right board — never standard drywall in a wet area. When we see a failed shower it is almost always a membrane that was skipped, a corner that was not banded, or a slope that sends water the wrong way.

Ventilation is not optional

An undersized or unducted fan is why bathrooms grow mould and paint peels. The fan must be sized for the room and vented to the exterior, not into the attic. Run it during the shower and for a stretch afterwards, ideally on a timer switch.

Layout decisions worth the money

· Moving the toilet drain is the most expensive fixture move; moving a vanity is the cheapest.

· A curbless shower needs the floor structure worked out early, not chosen at tiling.

· Niches and benches must be planned before waterproofing.

· Pot lights, a vanity light and a separately switched fan give you a bathroom that works at 6am and at 10pm.

Materials that hold up in Ontario homes

· Porcelain tile over ceramic in wet areas and floors

· Large format tile for fewer grout lines, with the right setting method for flatness

· Epoxy or high-performance grout in showers

· Solid surface or quartz vanity tops over laminate in a family bathroom

· Quality valves and cartridges; the trim is cosmetic, the valve is what you replace a wall to fix

A realistic sequence

Demolition, rough plumbing and electrical, inspection where required, board and waterproofing, tile, then fixtures and finishing. Each stage has a cure or set time that cannot be compressed. A main bathroom typically runs a few weeks of site work, and rushing tile is the fastest way to a callback.

Before you sign anything

Ask what waterproofing system will be used and how the corners are treated, confirm the fan CFM and where it vents, and get the tile layout drawn rather than decided on the fly.