Selective Roof Demo and Surgical Brick Wall Cuts: A 6-Day North York Project

A North York homeowner is putting an addition on their house, and the new design calls for full-glass window walls across the entire back. Before the contractor could frame any of that, the existing roof and two brick walls had to come down. Not all of it. Just the parts in the way, cut clean to the exact line, with the chimney left standing.

That's selective demolition, and it's most of what we do at Doctor Demo. Here's how this one went, start to finish.

What was the job?

The project was in the Parkwoods area of North York, working alongside a developer client on a home addition. The scope had two phases: a selective roof demolition, and the removal of two brick side walls plus a rear wall and a structural steel beam.

The key word is selective. We weren't flattening the house. We were taking out roughly 85% of the roof while preserving the front portion, the section around the skylight, and the chimney all the way up to the roof line. The contractor needed specific openings cut to specific dimensions so the new windows and addition would drop straight in.

Phase one: the selective roof demolition

The roof came off first, over three days.

We left the front of the house and the skylight bay intact, and kept the chimney fully preserved as the rest of the roof came down around it. The walls flanking the chimney got flush cuts so the line sat clean against the brick.

One tip worth passing along if you ever deal with a shingled roof: when it's a single layer, strip the shingles off first. That leaves you a clean plywood deck underneath that pops up fast. It's quicker, it's cleaner, and it saves the client money because the crew isn't fighting shingles and sheathing at the same time.

The back wall told a similar story. The rear of the house had decking, sliding windows, and a steel beam. We pulled the deck boards but left the joists in place, since they ran from inside the house and were structurally sound. No reason to remove something that's staying.

Phase two: surgical cuts in the brick walls

With the roof gone, the brick came next, three more days.

Both side walls had to be cut all the way down to the main floor, because the contractor's plan turns that whole back section into glass. Identical situation on each side: a flush, straight cut running alongside the chimney, top to bottom.

For the brick we ran a Husqvarna K4000 cut-and-break dual-blade saw. It cuts as deep as 16 inches and leaves a clean edge in brick of just about any type. On a job where the contractor is installing new windows into the exact opening you leave behind, a clean cut isn't a nice-to-have. The straighter the cut, the easier the rebuild, and the saw pays for itself across every project we use it on.

Safety set the pace on this phase. Anytime the crew is working at height on brick, the scaffold goes up properly with rail guards on every level. Nobody works near an open edge without them. It's slower to set up and it's worth every dollar, because the team can move fast once they're not worried about footing.

Removing the structural steel beam

The last piece was the metal beam running across the full width of the back of the house, where the old deck used to tie in.

You don't just yank a structural beam out. We took it down carefully, then cut it into four sections so the crew could handle each piece safely and haul it out clean. The steel went to recycling rather than landfill.

The result

Six days, two phases, full cleanup.

The back of the house is now open and squared off exactly where the new glass walls go in, with straight cuts on both sides and the chimney standing untouched. The contractor gets to start his window installation and the new addition without reworking a single edge we left behind.

That's the whole point of selective work. The rebuild is only as easy as the demo was precise.

Key takeaways

• Selective demolition removes only the parts in the way (85% of this roof) while preserving features like the chimney and skylight bay.

• Strip shingles before plywood on single-layer roofs. It's faster, cleaner, and cheaper for the client.

• Brick walls feeding a contractor's window install need straight, dimension-exact cuts, which is why we run a deep-cutting concrete saw.

• Structural steel beams come out in sections, handled safely and recycled.

• The cleaner the demolition, the faster and cheaper the rebuild.

Thinking about an addition or renovation in the GTA?

If you've got a contractor ready to build and you need the old structure taken down to an exact line, that's our specialty. Selective roof demos, brick and wall removal, structural cuts, full cleanup, across Toronto and the GTA.