Bay Window Flashing Repair Where the Bay Roof Meets Your Wall
Bay window flashing repair is work my crew at Hearth Roofing handles start to finish. We re-flash the small roof over your bay where it meets the house wall, and the leak at your frame stops.
I do it on row houses, two-family and attached brick homes all over Queens.
Flashing specialist
Free estimateIs it the window or the flashing above it?
Water usually gets in at the joint where that little roof meets the wall, then runs down inside to the frame. The glass is rarely at fault.
Warning signs
- Stains around the frame, worst at the bottom corner where a kick-out should divert runoff off the wall
- Leaks only after wind-driven rain
- Peeling paint at the head or corners
- Soft or rotted sill
- Mold inside the bay
- Cracked caulk or lifted flashing outside
Brick or siding: how your bay ties into the house
Flashing depends on what the bay roof meets. It's the same detail as a main roof meeting a higher wall, only smaller.
Swipe to compare both walls
| Your wall | Masonry wallRow houses, attached brick | Sided wallFrame, semi-detached, single-family |
|---|---|---|
| Where it tucks in | Reglet cut into a mortar joint | Lapped up behind the siding |
| Pieces | Apron or head flashing, step flashing laid one piece per shingle course, counter flashing, kick-out | Head flashing, step flashing under the siding, kick-out |
| Metal | Copper or aluminum | Aluminum, copper on request |
| Usual failure | Mortar or sealant letting go at the reglet | Siding nailed over the metal with no lap |
What I find under the old metal sets the scope
The final scope gets set once the old flashing is off and I can see the wood. Then you'll know what the leak repair costs.
-
Resealing
Only the sealant has failed. The metal stays, and I cut out the old caulk and seal the joint watertight.
-
Usual job
Re-flashing
My usual bay job. New head, step and counter flashing, with ice and water shield and underlayment up the wall joint.
-
New roof over the bay
For rotted sheathing. I replace the boards, then lay underlayment, drip edge, shingles or metal, and new flashing.
Three things people ask me about bay leaks
Yes. Bay window flashing repair almost never touches the window, since the water enters above it. I replace only sill or trim wood that's rotted.
Usually just access. Upper bays over storefronts may need scaffold, and I schedule around tenants. The flashing work is the same.
Usually one day. Resealing takes a few hours, and rebuilding the roof over the bay can run into a second day.
Water at the frame? I'll find where it's getting in
I inspect the flashing and water-test the joint, then give you a price before anything comes apart.