What is the best way to cut drywall for curved walls or arched openings in a GTA home renovation?

Curved drywall work — whether it's an arched doorway, a radius wall, or a curved bulkhead — requires either wet-bending standard drywall or using a specialty flexible drywall board, and the right choice depends on the tightness of the curve and the finish quality you need. This is one of the more skill-intensive drywall techniques, and in the GTA market it typically adds 30 to 50 percent to the per-square-foot cost of the curved sections compared to flat work.

For gentle curves with a radius of 5 feet or more, standard 1/4-inch drywall is the go-to material. Quarter-inch board is thin enough to flex around gradual curves without breaking. You simply bend it dry against the curved framing and screw it in place, starting at one end and working around the curve, driving screws every 6 to 8 inches to hold the board against the studs. For extra rigidity and to meet code requirements for wall thickness, most GTA contractors apply two layers of 1/4-inch board, staggering the joints between layers. This gives you 1/2-inch total wall thickness with a smooth, strong curve. Quarter-inch drywall runs about $12 to $16 per 4x8 sheet in the GTA.

For tighter curves — radius under 5 feet — you need to wet-bend the drywall. The process involves scoring the back (brown paper side) of a 1/4-inch or 3/8-inch sheet with a scoring tool or utility knife, making parallel cuts about 1 inch apart across the width of the board, perpendicular to the curve direction. The scores should cut through the back paper and into the gypsum core without penetrating the face paper. Then you wet the scored side thoroughly with a spray bottle or roller, applying water generously and letting it soak for 30 to 60 minutes. The moisture softens the gypsum core, allowing the board to bend around tighter curves without snapping. Once positioned and screwed to the curved framing, the board dries in place and holds its shape permanently. In Toronto's dry winter months, you may need to apply water more than once because the low indoor humidity (often 15 to 25 percent when furnaces are running) causes the board to dry out before it's fully flexible.

Flexible drywall (commonly sold as Flexboard by CertainTeed) is a specialty product specifically engineered for curved applications. It has a reinforced face that allows it to bend to radii as tight as 24 inches (about 2 feet) without scoring or wetting. This is the product professional GTA drywall crews prefer for tight arches, curved soffits, and radius walls in high-end homes. The trade-off is cost — flexible drywall runs $35 to $50 per 4x8 sheet in the GTA, roughly three times the price of standard 1/4-inch board. For a typical arched doorway requiring 15 to 20 square feet of curved material, the board cost difference is $30 to $60, which is minimal on a professional project.

Cutting the curved shape requires marking an accurate template first. For arched openings, most contractors build the curved framing first using a plywood template cut to the desired radius, then trace the curve onto the drywall by holding the sheet against the framed arch and marking from behind. The curve is cut with a drywall jab saw, a rotary cutout tool, or for very smooth curves, a jigsaw with a fine-tooth blade. The jigsaw produces the cleanest edge on curved cuts but generates more dust than a hand saw.

Finishing curved drywall is where the real skill comes in. Flat joints are relatively forgiving, but curved joints telegraph every imperfection. The inside of an arch requires flexible vinyl corner bead (like No-Coat or Trim-Tex Archway Bead) rather than rigid metal corner bead, which cannot follow curves. Flexible arch bead costs about $8 to $15 per piece in the GTA. The compound work on curves requires extra coats — typically four rather than the standard three — because each coat must be feathered wider to create a smooth, imperceptible transition. Level 5 finishing is often recommended for curved sections because raking light from windows accentuates any ridges or tool marks on curved surfaces even more than on flat walls.

For homeowners considering DIY curved drywall, small arched openings with generous radii (4 feet or more) are manageable with patience and 1/4-inch board. Anything tighter, any radius wall longer than a few feet, or any curved ceiling work should be left to a professional drywall contractor. Curved finishing in particular is a specialist skill — expect to pay $6.00 to $12.00 per square foot for curved sections including hanging and finishing in the GTA, compared to $5.00 to $8.00 for standard flat work.