Selective Structural Demolition in a Building That Stays Open

Anything that carries load needs an engineer's design before it's touched. That design says what's coming out, what's replacing it and how the load is held in the meantime. In Markham, structural changes also need a building permit, and the design forms part of that application.

If you don't have drawings yet, that's the first step. A demolition contractor can't safely plan around a guess.

Temporary support is what keeps the rest of the building standing while the work happens.

• Shoring posts and beams are set to the engineer's specification
• They're checked before any structure is disturbed
• Often the new beam or header goes in first, then the old wall comes out under it
• Shoring stays until the permanent structure is accepted

In an open building, the work area needs a hard boundary. That can be plywood hoarding, sealed poly walls with zipper doors, or closing off a whole floor. Exits need to stay clear and signed, and if sprinklers or fire alarms have to be impaired, that's arranged through the building owner with a fire watch where it's required.

Think about the route too. How do workers, tools and debris get in and out without crossing through reception?

Cutting concrete, block or brick creates silica dust, and that's a health hazard for workers and occupants. Wet cutting, dust-extracting tools and negative air in the work area help keep it contained.

Noise and vibration are harder to hide. Schedule the loudest work for agreed times, stay inside Markham's construction noise hours, and warn sensitive neighbours like labs or clinics ahead of time.

Older buildings often hide things: an extra beam, an old repair, abandoned wiring or a material that wasn't in the survey. Agree in advance who gets called and make it clear that work stops until the question is answered. The Designated Substance Survey under OHSA section 30 should be in hand before work starts, and anything suspect that isn't in it gets tested before it's disturbed.

People put up with a lot if they know it's coming. Before work starts, send a short notice through the property manager: which area is affected, the working hours, which days will be loudest and who to contact. Update it when the schedule changes. After each phase, walk the boundary with the building contact to make sure exits, signs and protection are still where they should be. It's a small effort that saves a lot of complaints.

Honestly, always, for anything load-bearing. Even small openings can surprise you. A contractor who does structural demolition will work from the engineer's drawings, set and check the shoring, and coordinate the other trades. If the job also includes finish removal around the opening, interior demolition can be written into the same scope so you've got one crew handling the whole area.

Keeping a building open during structural work depends on the assessed engineering, support, separation, access and service arrangements. Agree the permitted occupied areas and expected disruption with the building contact before work starts. Siteforce Demolition Markham plans selective structural work around occupied buildings across Markham and York Region. If you're planning a change like this, request a free estimate.