Do I need fire-rated drywall around my gas fireplace and how much does it cost compared to regular drywall in Ottawa?

You do not need fire-rated drywall around a properly installed gas fireplace if you maintain the manufacturer's specified clearances to combustible materials, but fire-rated drywall can allow for reduced clearances in tight spaces and provides an extra margin of safety. Most direct-vent gas fireplaces require 6 to 12 inches of clearance from combustible materials like standard drywall, while fire-rated drywall may reduce those clearances to 2 to 6 inches depending on the specific fireplace model and manufacturer specifications.

Fire-rated drywall (also called Type X drywall) contains glass fibers and other additives that slow the spread of fire and maintain structural integrity longer during a fire. In Ottawa fireplace installations, it's most commonly used when homeowners want to build a closer surround, install built-in cabinetry near the fireplace, or when the room layout makes it difficult to maintain standard clearances. The Ontario Building Code requires specific clearances for gas appliances, but these can often be reduced with approved fire-rated materials and proper installation techniques.

Cost comparison in Ottawa for 2025-2026: Regular ½-inch drywall runs $18 to $25 per 4x8 sheet, while fire-rated Type X drywall costs $22 to $32 per sheet — roughly 20 to 30 percent more than standard drywall. Installation labour rates are identical since fire-rated drywall cuts, hangs, and finishes exactly like regular drywall. For a typical fireplace surround covering 150 to 200 square feet, you're looking at an additional $50 to $100 in material costs to upgrade to fire-rated drywall.

The decision often comes down to your specific installation requirements rather than cost, since the price difference is minimal. Your TSSA-licensed gas fitter will specify the required clearances during installation, and fire-rated drywall becomes valuable when those clearances conflict with your design goals. Remember that any gas fireplace work must be performed by a licensed professional — the clearance requirements and material specifications are part of the safety certification process that protects your family and maintains your insurance coverage.

If you're planning a gas fireplace installation or renovation that involves close clearances or custom surrounds, you can browse experienced gas fitters and fireplace installers through the Ottawa Construction Network directory to discuss your specific layout and clearance requirements.