How much does mould-resistant drywall cost for a Metro Vancouver basement?

Mould-resistant drywall for a Metro Vancouver basement costs $24 to $32 per 4x8 sheet for materials, with full installation (supply, hang, tape, mud, sand, and prime) running $4.50 to $8.00 per square foot of wall and ceiling area. For a typical 800 to 1,200 square foot basement, the total drywall cost — including mould-resistant boards — ranges from $6,000 to $14,000 depending on the layout complexity, number of rooms, and ceiling type.

Mould-resistant drywall uses a fibreglass face instead of paper, which eliminates the organic food source that mould needs to colonize. Standard paper-faced drywall in a Metro Vancouver basement is a recipe for mould growth — the region's marine climate drives outdoor humidity above 80% for months on end, and below-grade concrete walls create persistent condensation that soaks paper-faced drywall from behind. Using mould-resistant drywall is not a luxury upgrade in Metro Vancouver — it's the baseline standard for any competent basement finishing contractor.

The most common mould-resistant drywall products available from Metro Vancouver building suppliers include Georgia-Pacific DensArmor Plus ($26–$32 per sheet), CertainTeed M2Tech ($24–$30 per sheet), and National Gypsum Gold Bond XP ($24–$28 per sheet). These are all 1/2-inch panels suitable for walls. For ceilings, 5/8-inch mould-resistant boards cost $30 to $40 per sheet and provide better sag resistance over joist spans. Where fire rating is required — such as the ceiling between a secondary suite and the main floor — you'll need 5/8-inch Type X fire-rated mould-resistant drywall at $35 to $45 per sheet.

Comparing the Full Cost

Standard paper-faced drywall costs $12 to $18 per 4x8 sheet — roughly half the price of mould-resistant board. That $10 to $15 difference per sheet adds up to approximately $500 to $1,200 more for a typical basement when you compare material costs alone. However, this premium is insignificant compared to the cost of mould remediation if paper-faced drywall fails. Professional mould remediation in a Metro Vancouver basement runs $3,000 to $15,000+ depending on the extent of contamination, and it requires ripping out and replacing the affected drywall, insulation, and sometimes framing — essentially starting over.

Beyond mould-resistant drywall, your entire wall assembly needs to work together to manage moisture. The insulation strategy behind the drywall is equally important. Never install fibreglass batt insulation directly against a concrete foundation wall in Metro Vancouver — moisture will condense on the cold concrete, saturate the fibreglass, and create mould behind the drywall regardless of the facing material. The recommended approach is closed-cell spray foam ($3.00–$5.50 per square foot at 2 inches) directly on the foundation, which insulates, creates a vapour barrier, and prevents condensation. Alternatively, XPS rigid foam board ($1.25–$2.75 per square foot at 2 inches) adhered to the foundation with taped seams provides a moisture-resistant thermal break, with mineral wool batt in the stud cavities for additional R-value.

A vapour barrier (6 mil poly) is required on the warm side of the insulated wall assembly unless you're using closed-cell spray foam at 2 inches or greater, which qualifies as its own vapour retarder under the BC Building Code. Your contractor should also ensure proper ventilation and dehumidification — mould-resistant drywall resists mould growth but doesn't eliminate moisture. A dehumidifier maintaining 30% to 50% relative humidity and adequate HVAC airflow are essential components of a mould-free Metro Vancouver basement.

Every basement finishing project requires a building permit from your local municipality, and contractors must carry WorkSafeBC coverage. If you're planning a basement finish in Metro Vancouver, Vancouver Basement Finishing can match you with experienced contractors who understand the region's moisture challenges — get matched for free through the Vancouver Construction Network.

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