What type of drywall should I use in a high-moisture bathroom in the Lower Mainland?

For high-moisture bathrooms in the Lower Mainland, you should use moisture-resistant drywall (often called "green board") or cement board, depending on the specific application and your budget.

In Vancouver's wet climate, bathroom moisture management is critical year-round. Moisture-resistant drywall is your standard choice for most bathroom walls and ceilings. This drywall has a water-resistant core and green paper facing that can handle typical bathroom humidity better than regular drywall. It's suitable for areas that don't receive direct water contact, like walls behind toilets, vanities, and general bathroom areas.

For shower and tub surrounds where direct water contact occurs, you'll want to step up to cement board (like HardieBacker or Durock) or fiber cement board. These products are completely waterproof and provide the ideal substrate for tile installation. They won't deteriorate if water gets behind your tile, which is especially important in Vancouver's high-humidity environment. The BC Building Code requires proper waterproofing in shower areas, and cement board is the gold standard for meeting these requirements.

Vancouver-specific considerations make moisture resistance even more important here. Our 1200mm+ annual rainfall and high humidity levels mean bathrooms stay damp longer than in drier climates. Proper ventilation is mandatory under the BCBC 2024 — you'll need an exhaust fan rated for your bathroom size (typically 50+ CFM for standard bathrooms) that vents directly outside, not into the attic. Many older Vancouver homes, especially Vancouver Specials and character homes, have inadequate bathroom ventilation that needs upgrading.

Professional installation is recommended for cement board applications, especially around shower valves and corners where proper sealing is critical. A licensed contractor will ensure proper vapor barriers, appropriate fastening, and code-compliant installation. For simple moisture-resistant drywall replacement, experienced DIYers can handle this, but any electrical work (like fan installation) requires a licensed electrician and Technical Safety BC inspection.

Next steps: Measure your bathroom areas, determine which zones need moisture-resistant vs. cement board treatment, and get quotes from contractors if you're doing a full renovation. Budget roughly $2-4 per square foot for moisture-resistant drywall installation, or $4-8 per square foot for cement board in shower areas. Remember that proper waterproofing behind your finish materials is just as important as choosing the right substrate.

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