What type of drywall should I use in a Vancouver basement?

Use mould-resistant drywall throughout your entire Vancouver basement — not just in wet areas, but on every wall and ceiling. Standard paper-faced drywall is the single biggest mould risk in Metro Vancouver basements because the paper backing absorbs moisture from the persistently humid below-grade air and becomes a breeding ground for mould colonies within months.

Mould-resistant drywall uses a fibreglass mat facing instead of paper, which eliminates the organic food source that mould needs to grow. In Metro Vancouver's marine climate, where outdoor humidity regularly exceeds 80% for six months of the year and below-grade spaces trap condensation against cool concrete walls, this upgrade is not optional — it is essential protection for your investment. Brands like DensArmor Plus and Gold Bond eXP are widely available at Metro Vancouver building supply stores, and your contractor should be using one of these products as standard practice.

For basement bathrooms and laundry areas, step up to cement board or fibre cement board (such as Durock or HardieBacker) behind tile and in shower surrounds. These products are completely waterproof and provide the rigid, stable surface that tile adhesive and grout require. The BC Building Code requires moisture-resistant materials in wet areas, and cement board satisfies this requirement while also preventing the soft, spongy failures that occur when standard drywall gets repeatedly exposed to shower steam and splashing.

If you are finishing a basement that has any history of dampness, even minor seasonal condensation, consider using fibreglass-faced drywall rated for high-humidity environments on walls adjacent to the foundation. These panels have enhanced moisture resistance in the core gypsum itself, not just the facing. They cost roughly $24 to $32 per 4x8 sheet in Metro Vancouver — about $4 to $8 more than standard drywall — but the cost difference across an entire basement is typically only $300 to $600 extra. Compare that to a mould remediation bill of $3,000 to $10,000 and the decision makes itself.

For ceilings, mould-resistant drywall is equally important, particularly if your basement has any ductwork or plumbing running above. Condensation from cold water pipes dripping onto a paper-faced ceiling will create mould patches that spread behind the surface before you ever see them. If you are installing a drop ceiling instead of drywall, the same principle applies — choose fibreglass-faced ceiling tiles rather than standard mineral fibre tiles that absorb moisture.

One detail many homeowners overlook is drywall thickness. Standard 1/2-inch drywall is adequate for most basement walls, but if your basement includes a secondary suite, the BC Building Code requires 5/8-inch Type X fire-rated drywall on the fire separation between the suite and the main dwelling. This fire-rated drywall must be installed on both sides of the separation wall and on the ceiling of the suite, with all joints properly taped and mudded to maintain the one-hour fire rating. Your municipal building inspector will check this during the framing and drywall inspection.

A practical tip for Metro Vancouver basements: leave a 1/2-inch gap between the bottom edge of your drywall and the concrete floor. This prevents the drywall from wicking moisture up from the slab through capillary action. Cover the gap with baseboard trim after painting. This small detail prevents the most common source of lower-wall mould damage in finished basements across the region. If you need help finding a contractor who understands Vancouver's moisture challenges, Vancouver Basement Finishing can match you with experienced local professionals for free.

---

Find a Basement Finishing Contractor

Vancouver Basement Finishing connects you with experienced contractors through the https://vancouverconstructionnetwork.com:

• Good Old Wood ✓
• Luvipe Excavation Ltd. ✓
• SRS Roofing & Exteriors ✓