What is the best type of drywall tape to use for inside corners in a Toronto home renovation?

Paper tape is the best choice for inside corners in Toronto home renovations — it folds precisely along its factory centre crease to create a clean, sharp corner, and it provides superior crack resistance compared to mesh tape in the high-movement environment of GTA homes. While mesh tape has its place in drywall finishing, inside corners are specifically where paper tape excels due to the mechanical demands of the joint.

Inside corners are structurally different from flat joints. Where two walls meet or where a wall meets a ceiling, the angle between the drywall sheets shifts slightly with seasonal building movement. Toronto's 50-plus freeze-thaw cycles per year cause framing members to expand, contract, and shift, and that movement concentrates at inside corners. Paper tape handles this stress because it is embedded in a bed of compound across the full width of the tape, creating a strong, continuous bond. The factory crease along the centre allows the tape to flex along the corner angle as the building moves, distributing the stress rather than concentrating it at one point.

Mesh tape is a poor choice for inside corners for several reasons. First, mesh tape is self-adhesive and does not fold into a clean crease — it bunches, wrinkles, and resists sitting flat in the corner. Second, mesh tape relies on the compound to provide all of the joint strength (the fibreglass mesh has very low tensile strength across its width), and inside corners experience both tension and shear forces from building movement. Third, mesh tape used with pre-mixed compound (which most homeowners reach for) is prone to cracking at inside corners because pre-mixed compound is softer and more flexible than setting compound, and it does not reinforce the mesh fibres adequately. The combination of mesh tape and pre-mixed compound at inside corners is a recipe for cracking within one to two GTA heating seasons.

The proper technique for paper-taping inside corners starts with applying a generous bed of compound on both sides of the corner using a 4-inch or 6-inch drywall knife. Fold the paper tape along its centre crease and press it into the compound, starting at the top and working down. Use your knife to embed the tape firmly on one side of the corner, then the other, squeezing out excess compound while leaving enough beneath the tape for a solid bond. A common professional technique is to embed and coat one side of the corner, let it dry, then come back and do the other side — this prevents the knife from disturbing the freshly embedded tape on the opposite side. This two-pass approach takes longer but produces cleaner corners, especially at wall-to-ceiling joints where the angle is most critical.

For homeowners looking for an even easier inside corner solution, pre-creased paper-faced metal corner tape (like Strait-Flex or No-Coat inside corner tape) is an excellent option. This product has a thin metal or plastic spine bonded to paper facing, creating a perfectly straight inside corner that resists cracking better than standard paper tape. It costs more — roughly $15 to $25 per 30-metre roll compared to $5-$8 for standard paper tape — but it saves time and produces a superior result, especially on long runs like ceiling-to-wall joints in open-concept GTA homes where a wavy corner line is very visible.

For the finishing coats over paper tape at inside corners, use a corner knife (inside corner trowel) or a standard 6-inch knife run along each side separately. Apply thin coats of topping compound, feathering outward 10-15 centimetres from the corner on each side. Sand carefully with a sanding sponge rather than a sanding block — sponges conform to the corner angle without gouging one side or the other.

The one situation where mesh tape is acceptable at inside corners is when used with setting compound (hot mud) by an experienced professional who is building up the corner in a single thick application for speed. Setting compound is hard and strong enough to compensate for mesh tape's lower tensile strength. But for the vast majority of GTA residential renovations, standard paper tape in the corner is the proven, reliable choice.

A professional drywall contractor will charge the same rate whether they use paper or mesh tape — the material cost difference is negligible. If you are hiring a pro for your renovation, confirm that they use paper tape for inside corners. If you are tackling corners as a DIY project, paper tape requires more skill to embed cleanly (getting the tape to sit flat in the corner without bubbles or wrinkles takes practice), but the result is far more durable than mesh. For a typical room with eight inside corner joints, expect the taping and finishing of corners to take about two to three hours of professional time across two coats.