Emergency flat roof repair after storm damage in Caledon
Quick assessment and practical repair for an emergency leak on a two-storey flat roof, done to code and built to last.
- 1
1 — Fast assessment and emergency patching
First pass: stop active leaks. We removed wet insulation from accessible vents and installed temporary vapor-tight flashings and a mechanical fastened cover patch to stop interior damage. That bought time to schedule the full repair and keep the structure dry.
- 2
2 — Strip to deck and inspect the substrate
Once weather allowed, we stripped the failed membrane back to the plywood/OSB deck. We inspected for rot, checked nail pulls, and verified deck fastener spacing — replacing any compromised deck sections and sistering joists as needed to meet solid substrate requirements.
- 3
3 — Improve slope and drainage
To address ponding we installed tapered polyiso insulation to create a positive slope toward existing scuppers and gutters. Polyiso meets local performance expectations and adds R-value; we mechanically fastened it per manufacturer specs to avoid future uplift in high winds around Caledon and Peel County.
- 4
4 — Install new membrane system
We chose a torch-applied SBS modified bitumen membrane for the finish — two plies with a flood coat at laps and 100 mm minimum overlap. Torch-applied SBS gives reliable seam welds and good flexibility for freeze-thaw cycles common around Toronto and neighbouring Mississauga.
- 5
5 — Flashings, copings and quality checks
We rebuilt metal flashings in aluminium, sealed through-penetrations with polyurethane flashing and set counterflashing at wall joints. Final steps: flood testing low areas, checking scupper capacity, and documenting fastener patterns and materials for the homeowner’s files.
Frequently Asked Questions
How long does an emergency repair like this take?
Initial temporary patching is done the same day when possible. Full strip-and-replace on a two-storey flat roof typically takes a few days of on-site work depending on deck repairs and weather windows in Caledon.
How disruptive is the work to the household?
We work from the exterior and keep interior disturbance to a minimum. Expect some truck and ladder staging in the yard and short periods of noise while stripping and torching, but we keep access routes clear and communicate timing by email.
When is a roof patch not enough?
If insulation is saturated, seams have multiple failures, or there’s persistent ponding, a patch only delays the main failure. In those cases we recommend full removal and replacement with upgraded insulation and flashing details.
Need an emergency flat roof fix in Caledon?
We handle storm damage across Caledon and Peel County with practical, code-aware repairs. Email us the photos and we’ll respond with a plan.
Get a Free Quote