Shingle-to-flat transitions
The single most common leak on a Kirkwood addition. Done right, the membrane runs up under the shingle course with a proper transition flashing. Done with caulk, it fails again every year.
Flat roof repair in Kirkwood, at a glance
STL Roof Repair repairs flat and low-slope roofs in Kirkwood, Missouri — mid-century flat-roofed homes, the porch, sunroom, garage and addition roofs on older Kirkwood houses, and the low-slope roofs on downtown storefronts along Kirkwood Road and Argonne. We are John Beal Roofing, family-run since 1947 and third-generation owned, working central St. Louis County out of Maryland Heights. Free inspection, written estimate, lifetime workmanship warranty on qualifying work, and a live person on (314) 429-6000 day or night.
Kirkwood does not have much acre-scale commercial roof, and that changes this page. Nearly all the low-slope work we do in 63122 is on houses: the flat-roofed mid-century homes tucked into the older streets, the screened porches and sunrooms added to Victorians and Tudors over the last seventy years, detached garages with a near-flat deck, and the 1950s and 1960s rear additions that were built with a minimal pitch because nobody expected them to still be there. Downtown, the storefronts along Kirkwood Road and Argonne have low-slope roofs behind their facades, and those behave like small commercial buildings.
On the residential side the failure is remarkably consistent. It is the transition — the line where a low-slope roof ties into a steeper shingle roof or into a wall. That detail takes concentrated water off the main slope, it usually has a piece of metal that was face-nailed decades ago, and it opens up under freeze-thaw. Water then travels inside the addition's ceiling and appears at an interior wall, which is why so many Kirkwood homeowners spend a season convinced they have a plumbing problem.
What We Find
Common Kirkwood Low-Slope Failures
Wall junctions and counterflashing
Where a porch roof meets the house, the flashing has to be let into the siding or the masonry. Surface-sealed counterflashing on a brick wall will always come back.
Tree debris and standing water
Kirkwood's canopy is the reason people live here and the reason low-slope roofs here stay wet. Leaf mat holds moisture against the membrane and blocks the only drainage a flat roof has.
Old hot-mopped and roll roofing
Plenty of Kirkwood porch and garage roofs still carry brittle roll roofing or a hot-mopped asphalt system. Once it cracks and alligators, patching buys months, not years.
How We Approach It
Finding The Real Entry Point
We look above and around, not just at the stain
On a low-slope roof water runs sideways between the membrane and the deck. We inspect the whole low-slope area, every transition, and the wall above it.
We check what is under the membrane
A soft or spongy deck means water has been getting in for a long time. That changes the repair from a flashing detail to replacing decking, and you should know that before the crew arrives.
You get photos and a written price
You see what we saw. If the roof needs a section rebuilt rather than patched, the estimate says so and explains why.
A leaking low-slope roof over a finished sunroom or a first-floor ceiling does real damage fast, because there is no attic to catch it. If water is coming in tonight, call (314) 429-6000 — a live dispatcher answers, not voicemail, and emergency tarping gets it stopped until the repair can be done properly.
Common Questions
Kirkwood Low-Slope Roof Questions
Do you repair flat porch and sunroom roofs on Kirkwood homes?
Yes, and that is most of our low-slope work in Kirkwood. Porches, sunrooms, breezeways, detached garages and 1950s rear additions, plus the transition where they tie into the main shingle roof.
Why does the leak show up at an interior wall?
Water that gets under a low-slope membrane travels along the deck before it finds a way down. On an addition with a finished ceiling it often runs to an interior wall, which is why the wet spot is nowhere near the actual failure.
Can a flat porch roof be shingled instead?
Not below the minimum pitch shingles require - water would back up under the courses. A low-slope roof needs a membrane system, and if the pitch is marginal we will tell you what it can and cannot carry.
Do you work on Kirkwood downtown storefronts?
Yes. Low-slope roofs behind a commercial facade get treated like small commercial roofs: we inspect the parapet, the drainage and every penetration, and we plan access before the crew shows up.
Free Kirkwood Flat Roof Inspection
Serving Kirkwood, Webster Groves, Des Peres, Glendale and central St. Louis County. Tell us where the water is showing up inside.
Related Pages
Related Kirkwood And Roofing Service Pages
Low-Slope Leak In Kirkwood?
We will find where the water is actually entering, photograph it, and price the repair in writing. Inspections are free.