Maps temperature differences in the attic and on the roof deck to find where water has saturated the underlayment and sheathing, even when there is no visible stain yet.
Roof Underlayment Repair in San Marino, Texas done right the first time
Roof Underlayment Repair in San Marino, Texas is the fix when water gets past your shingles and starts staining ceilings. We pull the failed section, check the deck, and install new synthetic underlayment that sheds water the way it should.
Serving San Marino and nearby areas.
How big is the underlayment job?
Multiple sections
Several leak points or a larger run of failed membrane.
- 1. Small section One failed area, often around a valley, boot, or flashing.
- 2. Multiple sections Several leak points or a larger run of failed membrane.
- 3. Full replacement Whole-roof underlayment, planned and quoted in writing first.
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- 40Services from one local team
- 218Areas served around San Marino
- Trace firstWe confirm the leak source before opening the roof
- Water testWe verify the repair before closing the roof
What is included in an underlayment repair
Every underlayment repair includes the leak trace, the material, the labor, and the cleanup.
Work order
Roof Underlayment Repair- Leak trace and inspection: We use a moisture meter, infrared thermal imaging camera, and hose test equipment to confirm the exact leak source before opening the roof. This step takes 30 to 45 minutes and keeps us from replacing underlayment that is still good.
- New synthetic underlayment: We install GAF, Owens Corning, or CertainTeed synthetic underlayment with the manufacturer's specified overlap and fastener pattern. On valleys and penetrations we add butyl tape and ice and water shield for extra protection.
- Flashing and boot reseal: Any flashing, pipe boots, or vent collars disturbed during the repair get reseated or replaced. We use Henry Company or Sika sealant at every seam. Cracked pipe boots get replaced, not just caulked over.
- Decking check and repair: We inspect the sheathing for soft spots and delamination. Rotted boards get replaced with matching thickness material before new underlayment goes down, so the roof lays flat and the repair lasts.
- Water test and cleanup: We run water over the repaired section and watch from the attic to confirm the leak is stopped. Then we button the roof up, magnet-sweep the yard for nails, and send you photos of the finished work.
What the first visit covers
First visit
We trace the leak, inspect the deck, and quote the repair before any work begins.
Underlayment repair at homes
We handle underlayment repair on every common home roof type in the area.
Ceiling stains
Recurring stains traced to failed underlayment
Attic moisture
Damp framing and musty smells from hidden leaks
Vent pipe leaks
Cracked boots and failed membrane at penetrations
Storm damage
Torn underlayment after hail or wind uplift
Underlayment repair at businesses
Flat and low-slope commercial roofs need membrane underlayment, not felt.
Flat TPO roofs
Seam and drain repairs on membrane systems
Retail buildings
Leak repair without closing the business
Office properties
Documented repairs for property records
What Roof Underlayment Repair in San Marino, Texas actually involves
Roof Underlayment Repair in San Marino, Texas is the trade of removing failed felt or synthetic membrane beneath your shingles and replacing it with new material that keeps water out. Underlayment is your roof's second line of defense.
Most San Marino homeowners call us after they spot a ceiling water stain or smell damp wood in the attic. By then the felt underlayment has usually been compromised for weeks. We handle San Marino roof underlayment repair on asphalt shingle, clay tile, and standing seam metal roofs, and we can usually schedule a same day Roof Underlayment Repair San Marino visit when the leak is active. If you need affordable roof underlayment replacement in San Marino TX, we quote the work before we start.
- What it is
- Replacing failed membrane beneath your shingles
- When it helps
- Recurring leaks, ceiling stains, damp attics
- What you get
- New underlayment, photos, and a water-tested repair
How our underlayment repair process works
Every job follows the same five steps. You know what is happening, what it costs, and when we leave.
Tools and methods we use
Each method answers a different question. Together they leave very little to guess.
Confirms the exact moisture content of decking and framing so we know how far the water has traveled and whether sheathing needs replacement.
Traces leaks on flat and low-slope roofs by detecting moisture under the membrane without cutting it open.
Applies controlled water to a specific roof section so we can watch from the attic and confirm the exact entry point before we open anything up.
Fastens new underlayment at the manufacturer's specified pattern for a consistent, code-correct install that holds up to wind uplift.
When underlayment repair makes sense
A homeowner in Monte Vista spots a brown ceiling stain after a heavy rain and the roof is 15 years old.
We trace the leak, find the felt underlayment has cracked along a valley, and replace that section with synthetic underlayment and ice…
HomesA property manager in Terrell Heights has three rental homes with recurring leaks around vent pipes.
We inspect all three roofs, replace the cracked pipe boots and the failed underlayment around each penetration, and reseal the flashing.
BusinessesA homeowner in Stone Oak files a hail damage claim and the adjuster approves shingle replacement but not underlayment.
We inspect the underlayment under the damaged shingles and document the hail bruising and tears with photos.
HomesA commercial building owner near the Medical Center has ponding water on a flat TPO roof and a leak at a drain.
We clear the clogged drain, repair the TPO membrane at the seam, and replace the underlayment layer around the drain collar.
Businesses
How underlayment repair runs in San Marino
San Marino sits in Bexar County, and the roof conditions here are hard on underlayment. Summer attic temperatures push 140 degrees, which dries out old felt until it cracks. Spring hail and straight-line winds tear shingles loose and expose the membrane underneath.
Monte Vista
Historic homes with original felt underlayment that has dried out and cracked. Tile and slate roofs here need careful handling to avoid breaking material.
Stone Oak
Newer construction with synthetic underlayment. Hail bruising and wind uplift are the main causes of failure we see here.
Terrell Heights
Mid-century homes with asphalt shingles and aging underlayment. Vent pipe boots and valley underlayment are the most common leak points.
- Monte Vista
- Stone Oak
- Terrell Heights
- Alamo Ranch
- Woodlawn Lake
From problem to finished result.
Slide to compare the photo with an illustrative inspection view. It is generated from the photo, not a measurement.
PhotoValley underlayment failure in Monte Vista
Before: A 1920s home had a recurring ceiling stain in the dining room after every heavy rain. Two previous roofers had patched shingles over the valley without addressing the underlayment. The felt had cracked along 12 feet of valley, and water was running sideways under the shingles.
After: We removed the shingles along the valley, replaced 12 feet of failed felt with synthetic underlayment and ice and water shield, reset the valley metal, and reinstalled the shingles. The water test passed on the first try. No leak in the two storm seasons since.
Hail-damaged underlayment in Stone Oak
Before: A spring hail storm bruised shingles across a 2,400 square foot roof. The homeowner filed an insurance claim, and the adjuster approved shingle replacement but not underlayment. Water was already showing up around two vent pipes.
After: We documented hail bruising and tears in the underlayment with photos, which supported a claim supplement. The underlayment was replaced across the affected area along with the shingles and both pipe boots.
Flat roof membrane leak near Medical Center
Before: A commercial building had ponding water on a TPO roof and a leak at a clogged drain. The membrane had separated at a seam, and water was getting under the underlayment layer around the drain collar. The tenant had a ceiling tile stain spreading.
After: We cleared the drain, repaired the TPO seam, replaced the underlayment around the drain collar, and checked the other three drains for the same issue. The ponding stopped and the ceiling tile was replaced. The repair has held through two rainy seasons.
Problems we solve with underlayment repair near you
Most underlayment failures show up as interior symptoms before anyone gets on the roof.
Ceiling water stains that keep coming back
Recurring stains mean water is still getting in. Patching shingles without fixing the underlayment just moves the leak and lets the deck rot continue.
Damp or musty smell in the attic
Attic moisture leads to mold on the framing within weeks in San Antonio's humidity. Once mold sets in, the repair cost goes up significantly.
Water around a vent pipe or chimney
Pipe boots and chimney flashing fail before the surrounding shingles do.
Shingles blown off after a storm
When shingles peel back, the underlayment underneath is exposed to UV and rain. If it tears, the deck gets wet and the damage spreads fast.
Why fix the underlayment instead of patching shingles
Patching shingles over rotten underlayment is a temporary fix that fails within a season. Replacing the underlayment solves the actual problem and protects the deck below.
Stops hidden leaks
Water travels sideways under shingles before it drips into your attic.
Protects the roof deck
Once water reaches the sheathing, rot sets in fast. In San Antonio's summer heat, a wet deck board can soften within a few weeks.
Extends shingle life
Shingles need a flat, dry surface to seal properly. When underlayment wrinkles or tears, shingles flex and crack at the seams.
Keeps your warranty valid
We install GAF and Owens Corning approved underlayment systems and document the work so your coverage stays intact.
What underlayment repair costs
The price depends on how much roof we have to open, the roof pitch, the material, and whether sheathing needs work.
Included
Quoted after a first look
- Leak trace and inspection
- New synthetic underlayment
- Flashing and boot reseal
- Decking check and repair
What changes the scope
Quoted after a first look
- Roof area affected
- Roof pitch and access
- Decking condition
- Underlayment material
What you receive after the repair
Clear records you can keep and share.
Repair photos
Before, during, and after shots of the work
Material summary
What underlayment and sealants were installed
Written scope
What was repaired and what was inspected
Local experience with San Marino roof underlayment
We have worked on San Marino roofs long enough to know what fails here and why.
Moisture readings
We read deck and framing moisture to see how far water has traveled.
Thermal images
We read temperature differences to find saturated areas with no visible stain.
Deck condition
We check sheathing for soft spots before new underlayment goes down.
Towns we serve.
Based in San Marino and covering the places around it. Pick one for local details.
What San Marino homeowners say
We had a ceiling stain that kept coming back after two other roofers patched shingles. These guys got in the attic with a moisture meter, found the underlayment had failed along a valley, and replaced it the same day. No leak since, and we have had two good rainstorms. They also showed me photos of the repair before they closed it up.
After the hail storm in the spring, we had water coming in around a vent pipe. They replaced the pipe boot and the underlayment around it, and resealed the flashing. Took about three hours. Price was what they quoted, no add-ons. They swept the yard for nails before they left, which I appreciated with two dogs.
We manage several older rental homes in the area and underlayment failures are constant. This crew is reliable, they document everything with photos, and the pricing is fair. They replaced underlayment on a 1940s house last month and it has held through every storm since. We use them for all our roof leak work now.
Frequently asked questions about underlayment repair
Short answers for the first few minutes. The team can cover the rest.
Still have a question?
Describe what you are seeing and we will point you to the right next step.
2109395773The biggest cost drivers are how much roof we have to open, whether sheathing needs replacement, and the roof pitch. Flat roofs and steep tile roofs take longer. We give you a written price before we start.
Yes. We cover all of San Marino and the surrounding San Antonio neighborhoods, including Stone Oak, Alamo Ranch, Monte Vista, and Terrell Heights. For an active leak we can usually get out the same day. For planned roof underlayment replacement San Marino work, we schedule within the week. Call 210-939-5773 and we will confirm a window.
A single-section repair takes two to four hours on site. A full roof underlayment replacement on an average 2,000 square foot home runs one to two days, depending on weather and how much decking needs work. We do not leave a roof open overnight. If we cannot finish before dark, we tarp it and come back first thing.
Synthetic underlayment outperforms old felt in this climate. It resists tearing, handles the heat better, and does not absorb water the way felt does. For valleys and penetrations we use butyl tape and ice and water shield. On flat sections, Carlisle SynTec TPO or Firestone EPDM is the right call. We match the material to your roof type and slope.
Related services we handle
Other services from the same team.
Get your Roof Underlayment Repair in San Marino, Texas scheduled
2109395773Active leak, ceiling stain, or damp attic? Call us and we will trace it, quote it, and fix it.
Call for a roof leak inspection
Call 210-939-5773 and tell us where the water is showing up. We answer the phone during business hours and schedule most inspections within a day or two. If the leak is active, say so and we will move you to the front of the line.