Question 1

What happens if water gets behind shower tile?

Accepted Answer

Water behind shower tiles can cause serious structural damage, mold growth, and expensive repairs - it's one of the most common and costly problems in bathroom renovations.

When water penetrates behind shower tiles, it saturates the substrate (drywall, cement board, or plaster) and can reach the framing behind the wall. Drywall becomes soggy and crumbles, while wooden studs can rot and develop mold. The water often travels down inside the wall cavity, potentially damaging flooring, ceiling belo

Question 2

What is RedGard and when do I use it?

Accepted Answer

RedGard is a liquid-applied waterproofing membrane that creates a flexible, waterproof barrier under tile installations. It's essentially a red-colored rubber coating that you roll or brush onto surfaces before tiling to prevent water damage.

RedGard is essential for wet areas like shower walls, tub surrounds, and bathroom floors where water exposure is constant. Unlike traditional plastic sheeting or tar paper, RedGard bonds directly to the substrate and moves with natural building movement wi

Question 3

How do I waterproof a bathroom floor?

Accepted Answer

Proper bathroom floor waterproofing is essential to prevent water damage and mold growth beneath your flooring. The process involves installing a waterproof membrane system before your finish flooring goes down.

The most effective approach starts with preparing a clean, level subfloor. Liquid waterproof membranes are popular for Ottawa bathrooms because they create a seamless barrier that conforms to irregular surfaces. These are typically applied in two coats with a reinforcing fabric at seams

Question 4

Do I need a vapor barrier in my bathroom?

Accepted Answer

Yes, you need a vapor barrier in your bathroom, but the type and placement depend on your specific wall construction and renovation scope. Vapor barriers are crucial in Ottawa's climate to prevent moisture from penetrating wall cavities and causing mold, rot, or structural damage.

For most bathroom renovations in Ontario, the vapor barrier goes on the warm side of the insulation - typically between the insulation and the drywall. This is usually 6-mil polyethylene sheeting that creates a contin

Question 5

What is a shower pan liner?

Accepted Answer

A shower pan liner is a waterproof membrane installed beneath the shower floor to create a watertight barrier that prevents water from seeping into the subfloor and surrounding structure. It's essentially the foundation of your shower's waterproofing system, working as a backup protection layer even if water penetrates through the tile and grout above.

The liner is typically made from PVC, CPE (chlorinated polyethylene), or rubber membrane materials and must be installed in a specific layered s

Question 6

How do I know if my shower is properly waterproofed?

Accepted Answer

Proper waterproofing is critical for preventing costly water damage - signs of failure include loose tiles, musty odors, staining on adjacent walls, or soft spots in flooring near the shower.

A properly waterproofed shower should have a waterproof membrane behind all tile surfaces, not just caulking at joints. In Ontario, this typically means a liquid-applied membrane or sheet membrane system that extends at least 6 inches beyond the shower area on all sides. The membrane should be continuous -

Question 7

How do I waterproof a shower curb?

Accepted Answer

Proper shower curb waterproofing is critical to prevent water damage and requires multiple layers of protection. The curb is one of the most vulnerable areas in a shower because it's constantly exposed to water and needs to redirect it back into the shower pan.

The waterproofing process starts with the curb construction itself. The curb should be built with a slight slope toward the shower interior (about 1/4 inch per foot) and must be properly integrated with the shower pan liner or waterproof

Question 8

How important is the bathroom exhaust fan really?

Accepted Answer

A bathroom exhaust fan is absolutely critical - it's one of the most important components for preventing moisture damage, mold growth, and maintaining indoor air quality in your home.

Moisture Control and Structural Protection
Without proper ventilation, steam from showers and baths creates excessive humidity that leads to serious problems. Moisture gets trapped in walls, ceilings, and hidden spaces where it causes wood rot, drywall deterioration, and paint peeling. In Ottawa's climate, where w

Question 9

My bathroom has mold. Can I just paint over it?

Accepted Answer

No, you should never paint over mold. Painting over mold doesn't eliminate it - the mold will continue growing underneath the paint and can cause the new paint to peel, bubble, or discolor within weeks or months.

Mold must be properly removed before any cosmetic work. The underlying moisture problem needs to be identified and fixed, or the mold will return. Simply covering mold with paint can actually make the problem worse by trapping moisture and creating an even better environment for mold g

Question 10

Is there such a thing as too much ventilation?

Accepted Answer

Yes, there can be too much ventilation in a bathroom, but it's rarely a practical concern for most homeowners. The main issues arise when ventilation is dramatically oversized or improperly controlled.

Excessive ventilation can create problems like pulling conditioned air out of your home too quickly, leading to higher heating and cooling costs. In winter, over-ventilation can draw cold air into the house through gaps and cracks, making your heating system work harder. Very powerful fans can al

Waterproofing & Moisture