Flat Roof and Chimney Leak Repair in Toronto

Identifying the Problem

A homeowner contacted The Roof Whisperer Toronto after noticing a leak running down the chimney wall. During our inspection, we discovered that the chimney was built after the flat roof installation. To make matters worse, the membrane had been cut around the bricks, and only caulking was applied at the joint between the roof and the chimney.

This type of shortcut creates weak points that almost always lead to leaks. Areas where flat roofs meet brickwork require proper detailing, not just caulking. Some manufacturers even provide winter training for flat roofing specialists on how to handle these details. At The Roof Whisperer, we invest in this training so our customers get long-lasting results.

Our Repair Solution

After reviewing our solution and quote, the customer approved the work. Our flat roofing specialist followed these steps:

• Installed two-ply SBS membrane flashing around the chimney base.

• Bent and installed a custom metal flashing for added protection.

• Carefully sealed areas where the membrane met the bricks.

• Aligned the top of the flashing with a mortar joint, ensuring the caulking adhered better and would last longer.

The Result

The chimney and roof are now fully sealed against leaks. The combination of SBS membrane, custom flashing, and proper detailing provides a durable, watertight system.

At The Roof Whisperer , we don’t cut corners—we repair flat roofs and chimneys with precision, training, and care.