Can I use regular drywall in a bathroom?

Regular drywall is not recommended in bathroom wet areas and is actually prohibited by building codes in shower/tub surrounds and other high-moisture zones. You need moisture-resistant materials in these critical areas.

Standard drywall can be used in bathroom areas with normal humidity levels - like walls away from the shower, tub, and sink areas. However, even in these locations, many contractors recommend upgrading to moisture-resistant options for better long-term performance in Ottawa's climate where bathrooms experience significant humidity swings.

For wet areas around showers, tubs, and sinks, the Ontario Building Code requires moisture-resistant materials. The most common options are green board drywall (moisture-resistant drywall with a green paper facing), cement board, or Hardiebacker. Cement board is the gold standard for tile installations as it won't deteriorate if water penetrates the tile or grout over time.

Proper waterproofing is equally important regardless of your wall material choice. This includes waterproof membranes behind tile, proper vapor barriers, and ensuring all seams and penetrations are sealed. Many bathroom renovation problems stem from inadequate waterproofing rather than just the wall material choice.

In Ottawa's climate, where we experience significant temperature and humidity changes, using moisture-resistant materials throughout the bathroom provides extra insurance against potential moisture damage. The small additional cost upfront can prevent expensive repairs down the road.

For a bathroom renovation that meets current building codes and provides lasting protection against moisture damage, consider consulting with licensed renovation contractors who understand Ottawa's specific requirements and climate challenges.