At a glance: Completed 2026-10-19: dead valley tpo & shingle repair on Alternate Road, Pacific, MO 63069. Office: St. Louis, 314-429-6000.
The call on Alternate Road
The homeowner on Alternate Road called because water was showing up in a bedroom and running down the inside of the walls. That kind of leak almost never starts where you see it. On this house the source was up on the roof, where a raised section meets the main roof and forms a cradle, sometimes called a dead valley.
A dead valley is a spot where two slopes meet and water has nowhere good to go. Shingles there sit in slow-moving water after every storm, and once the granules and sealant give up, water gets under them and travels down the decking until it finds the wall cavity. That is exactly the pattern this homeowner was seeing in the bedroom.
What we found in Pacific 63069
The shingles in the cradle were the weak point, and the aluminum wraps on the windows along the upper raised wall were also part of the water path. Re-shingling the cradle would only have reset the clock, so the plan was to change the material in the problem spot.
What the work order shows
- Replaced the aluminum wraps on the windows along the upper raised roof wall.
- Removed the shingles from the cradle / dead valley.
- Installed TPO membrane where the shingles were removed, so the low spot is covered by a material made for slow water.
- Removed and replaced the rear shingled portion of the roof above it so the two materials tie together correctly.
- Cleaned up and hauled away all related debris.
Why a cradle leak fools so many homeowners
When water runs down a bedroom wall, the first thought is usually the window or the siding. On this Pacific home the windows were part of the story, which is why the wraps on the upper wall were replaced, but the larger volume of water was coming from the roof above. A cradle collects runoff from two directions. During a hard Franklin County downpour that pocket can hold standing water for a while after the rain stops, and shingles were never designed to sit in water.
The tricky part is that the inside of the house does not point to the cradle. Water enters at the low spot, follows the decking and framing, and drops into a wall cavity where it finally shows up as staining, peeling paint or a damp baseboard. Homeowners can spend years caulking windows and trim without touching the actual cause.
Choosing TPO for the low spot and shingles for the slope
Our crew did not try to make shingles do a job they are not built for. TPO is a heat-welded single-ply membrane used on low-slope commercial and residential roofs because it handles slow-moving and standing water. Installing it only in the cradle keeps the look of the home almost unchanged from the street while giving the problem area a material that can actually live there.
Replacing the rear shingled portion above the cradle at the same time mattered. The new shingles lap onto the membrane so water steps down from one material to the next instead of being driven under it. That tie-in is where a lot of patch jobs fail, and doing both sides in one visit meant the transition was built as one detail instead of two separate repairs.
Looking for a roofer near me in Pacific, 63069?
If you are searching for a roofer near me in Pacific, Gray Summit, Catawissa or Eureka, our St. Louis office already has crews working along I-44 and Highway 100 every week. This Alternate Road job is one example of the kind of leak we track down: one where the obvious answer and the real answer are not the same.
We start with a free inspection, walk the roof, and show you photos of what we find before we talk about price. Most leaks like this one are repairs, not replacements, and we will tell you which one you need.
What homeowners in 63069 should check after a heavy rain
After a strong storm rolls through Pacific, walk the inside of the house before you look at the roof. Check upstairs and back bedroom walls near any spot where an addition, dormer or raised section meets the main house. Look for paint that has bubbled, drywall tape that is lifting, or baseboards that feel soft. In the attic, a flashlight pointed at the decking under a cradle will show dark rings or a shine of moisture long before a ceiling stains.
Outside, binoculars from the yard can tell you a lot. Shingles in a cradle that look darker, flatter or bare of granules compared with the rest of the roof are taking more water than they should. Debris piling up in that corner, such as leaves or shingle grit, is another sign water is slowing down there.
Roof repair in Pacific, MO 63069
Pacific sits on the Meramec River at the western edge of the St. Louis area in Franklin County, and homes there see the same heavy spring rains and summer storms as the rest of the region. Roofs with additions, raised sections or dormers are especially common in older neighborhoods off Alternate Road and Osage Street, and those are the roofs most likely to have a cradle or dead valley.
If you live on or near Alternate Road and are seeing the same kind of problem, call our St. Louis office at 314-429-6000 or our 24/7 line at 1-800-564-6232 for a free inspection. We tell you whether a repair will do the job before anyone talks about replacement.
Questions homeowners ask about this repair
What is a dead valley on a roof?
It is a spot where two roof planes meet in a way that water collects instead of draining, often behind a raised section, dormer or chimney. Shingles there sit in slow water and fail early.
Why use TPO in a shingled roof?
TPO is a single-ply membrane designed for low-slope areas where water slows or ponds. Putting it only in the cradle, and keeping shingles on the steep slopes, uses each material where it works best.
Why did water show up on the bedroom walls instead of the ceiling?
Water that gets under shingles travels along the decking and framing until it finds an opening, so it often appears in a wall cavity well away from the actual entry point.
Do you repair leaks like this in Pacific and Franklin County?
Yes. Our St. Louis office serves Pacific, Eureka, Union, Washington and the rest of Franklin County. Call 314-429-6000 for a free inspection.
How long does TPO last in a dead valley?
TPO membranes are made for low-slope and ponding conditions and typically last far longer in a cradle than shingles do, as long as seams and terminations are installed correctly.
Will the TPO be visible from the street?
On most homes, including this one, the cradle sits behind a raised section and is hard to see from the ground.