CMU Door Opening Infill in Toronto, Ontario

This Toronto project involved CMU door opening infill to close two former doorways and restore a continuous wall line. CMU stands for concrete masonry unit, an 8-inch concrete block commonly used for structural walls and infill. Door opening infill strengthens wall continuity, supports layout changes, and leaves a surface that is ready for paint or other finishes. Key masonry terms on this job: a lintel is the support that carries loads over an opening; toothing means cutting back and staggering the edges of the existing masonry so new blocks interlock; a tie-in bonds the new CMU to the existing wall; a flush or straight finish means the new work aligns with the existing surface.

Work proceeded in two distinct areas. At the large opening, the crew first shored the wall above the lintel to keep it stable during removal. They took out the first course of blocks above the lintel and then removed the lintel itself. With the opening prepared, they toothed out both sides, tied the new CMU into the existing wall, and installed approximately 170–180 pieces of 8-inch block. The infill was finished flush so it could be painted or otherwise coated as required.

At the smaller opening, the existing lintel remained in place. The team cleaned and prepped the opening for a straight infill, then installed approximately 60–68 pieces of 8-inch CMU. They brought the work to a straight, level line to match the surrounding wall so finish systems could be applied.

Throughout the job, the sequence emphasized safety and stability. Shoring was used during lintel removal at the large opening, and the toothing and tie-in process ensured the new blocks bonded into the existing wall. Quality control focused on straight, level alignment with the existing wall line and a clean, flush face that is finish-ready.

All debris and waste were removed from site and disposed of properly. The scope included materials, labor, and disposal. The schedule for both infills was approximately three working days, allowing for shoring, lintel removal at the large opening, careful tie-in work, block installation, and a consistent finish across both areas. If you are consolidating spaces, decommissioning doorways, or seeking a secure closure of former openings, CMU block infill provides a straightforward path to a solid wall that aligns with your current layout and prepares the surface for paint or other finishes.