Gutter Repairs: Corner Seals

Corner seals are the most common gutter repair we perform — and for good reason. The corners where two gutter sections meet are under constant stress from Ontario’s freeze-thaw cycles, UV exposure, and the simple expansion and contraction of metal over time.

When a corner seal fails, water finds a way out. Left untreated, that leak can damage fascia boards, soffit, siding, landscaping, and even your foundation.

Signs You May Need a Corner Seal Repair

Watch for these warning signs around your gutter corners:

• Water dripping or streaming from a corner joint during or after rain
• Dark staining or streaking on fascia boards near a corner
• Water pooling near your home’s foundation at a corner location
• Visible cracks, gaps, or dried and shrunken old sealant at the joint
• Paint peeling on exterior walls below a gutter corner

What the Repair Involves

A proper corner seal repair is more involved than simply applying caulk over an existing joint. Our technicians follow a proven process to help create a lasting repair.

1. Remove all old sealant — dried, cracked, or separated material is fully cleaned out before anything new goes on.
2. Thoroughly dry and degrease the joint — trapped moisture under a new seal is one of the top reasons DIY repairs fail quickly.
3. Apply professional-grade waterproof gutter sealant rated for outdoor use and temperature extremes.
4. Inspect the surrounding gutter sections for any additional wear or issues while on site.

Why DIY Corner Seal Repairs Often Don’t Last

Many homeowners attempt to fix a leaking corner with hardware store caulk, and it often holds — for a season. The repair usually fails again when the wrong product is used, the joint is wet or dirty, or the old sealant was not fully removed first.

A professional repair uses the right materials and proper preparation, which is why our results last significantly longer.

Every corner seal repair we perform is backed by our 2-year leak-free guarantee. If the repaired corner leaks within two years of our work, we come back and fix it — at no charge to you. That’s our commitment to doing the job right.

What to Expect

Corner seal repairs are typically a quick, same-visit fix. Most jobs are completed in under an hour with no mess left behind. We’ll also let you know if we spot any other concerns during the inspection so you can make an informed decision — no pressure, no surprise charges.