Commercial Metal Roofing in Austin: Panel Types, Retrofits and Condensation
A worn commercial metal roof in Austin can often be repaired or covered with a new metal roof instead of torn off. The right choice depends on the panel type, the condition of the framing underneath, and whether the water inside is a leak or condensation. For shops, warehouses and small commercial buildings around Austin, Round Rock and Georgetown, Vantage Roofing sorts those three things out first, then gives the owner a written plan.
What kind of metal roof does my building have?
Commercial metal roofs in Central Texas usually fall into three groups:
Through-fastened panels (often called R-panel). Ribbed panels screwed straight through to the purlins, with a rubber washer under every screw. Common on shops and older metal buildings.
Structural standing seam. Panels joined with raised, machine-seamed edges and held down by hidden clips. These panels span open purlins without a deck and can be used on very low slopes.
Architectural standing seam. A similar look, but the panels need a solid deck and are usually used on steeper roofs.
From the ground, look for rows of screw heads across the panels. If you see them, it's a through-fastened roof. If the seams are raised and there are no screws in the flat part of the panel, it's standing seam.
Slope matters too. The building code allows standing seam down to 1/4 inch of fall per foot, while lapped screw-down panels need 3-in-12 (or 1/2-in-12 with lap sealant).
Why is my metal building dripping inside when it isn't raining?
That's often condensation, not a roof leak. The Metal Building Manufacturers Association explains that condensation forms when warm, moist inside air touches a surface colder than its dew point. In a metal building, the steel panels are that cold surface on a cool night.
Here's how to tell the difference:
Check the timing. Drips on cool, clear mornings with no rain point to condensation. Drips that start during a storm point to a leak.
Look at the insulation facing. In a typical metal building, the white or printed facing on the fiberglass blanket is the vapor barrier. Tears, open seams or gaps let moist air reach the steel. Wet spots often line up with those tears.
Think about what's inside. Vehicle shops, livestock, fresh concrete and fuel-burning heaters all add moisture to the air.
Note the pattern. Condensation tends to spread across wide areas. A leak usually shows up in one spot, near a screw line, lap, ridge cap or penetration.
The fix for condensation is inside the building: patch torn facing with matching tape, seal the seams, and add ventilation. A new roof won't solve it.
When does a screw-down metal roof just need maintenance?
On through-fastened roofs, many leaks come from the screws. The rubber washers harden and crack with sun and constant heating and cooling, and water follows the screw in.
The Metal Construction Association's installation manual is clear on the repair: replace a screw with a damaged washer with one of the same size, and replace a stripped screw with an oversized one. Smearing sealant over the screw head isn't a proper fix. Our metal roof repair guide covers screw, lap and flashing leaks in more detail.
New screws should match the roof metal or resist corrosion as well, because mismatched metals can corrode where they meet.
Can a new metal roof go over the old one?
Often, yes. This is called a retrofit. The International Building Code says a complete, separate system, such as a standing seam roof that carries its load straight to the building's frame, doesn't require tearing off the old roof.
A typical metal-over-metal retrofit works like this:
Survey the building. Measure the slope, panel profile and purlin spacing, and check panels and framing for rust or damage.
Check the structure. A structural engineer confirms the frame can carry the new roof and today's wind loads. Many older metal buildings were designed light, so this step matters.
Install sub-framing. New framing is fastened through the old panels into the existing purlins, only as much as crews can cover that day.
Add insulation if you want it in the space between the old and new roofs.
Install the new panels and trim, then flash curbs, vents and gutters.
A Metal Building Manufacturers Association white paper lists the main benefits: the old roof keeps the building dry during the work, the business can keep running, less goes to the landfill, and existing insulation can stay. In Austin, a re-roof or retrofit still needs a commercial permit.
How do hail and wind affect a commercial metal roof in Central Texas?
NOAA's Storm Events Database lists 104 reports of hail 1 inch or larger in Travis County since 2021 and 146 in Williamson County, including 4-inch hail in Round Rock on September 24, 2023. On metal, hail dents are often cosmetic. If the paint cracks or flakes, rust can follow.
Wind is the other test. The building code requires structural metal roof panels to be tested for wind uplift, so a new roof or retrofit has to use a tested panel and attachment that fit your building's wind design.
Watch the materials, too. Suppliers advise that Galvalume panels shouldn't touch copper, lead, wet concrete or pressure-treated wood, or take runoff from copper.
Repair, retrofit or replace: how do we decide?
Repair when the panels are sound and the problems are screws, a few laps, or flashing at curbs and vents.
Retrofit when the panels are rusting through in many spots or leaking all over, but the frame is solid and the business needs to stay open.
Replace when the framing is damaged or the old roof can't support new work.
Sometimes the roof doesn't need work at all. If the water is condensation, an AC drain or a plumbing line, we'll tell you so you can call the right trade. Austin's energy code also requires a reflective surface on larger jobs over air-conditioned space. Our commercial roofing guide covers that rule and other system choices.
Schedule a commercial metal roof inspection
Call (737) 383-1768 to schedule a free roof inspection. We'll check the panels, screws, laps, flashing and insulation, show you photos, and tell you honestly whether the building needs a repair, a retrofit, a replacement, or nothing at all. Vantage Roofing backs its work with a 10-year workmanship warranty on full replacements and up to 1 year on service repairs.
Frequently asked questions
Can you come look at my metal building roof first?
Yes. Vantage Roofing does free roof inspections on commercial metal roofs around Austin. We look at the panels, screws, laps, ridge, flashing and the insulation inside. You get photos and a written estimate. If the roof only needs a few screws replaced, or the water is condensation and not a leak, we'll tell you that.
Is it a leak or condensation dripping from my metal roof?
If the drips show up on cool, clear mornings with no rain, it's likely condensation. Warm, moist air inside the building meets cold steel and turns to water. Torn insulation facing makes it worse. If the drips start during storms and come from one spot, near a screw line or lap, it's more likely a leak.
Do I have to tear off my old metal roof to get a new one?
Not always. The building code allows a new standing seam roof over the old one when the new roof carries its own load to the building's frame. That means new sub-framing fastened into the existing purlins. An engineer should confirm the structure can handle it. Tear-off is needed when the framing or old roof is too damaged.
How fast can someone come out if my shop roof is leaking?
Call (737) 383-1768 and we'll set up a time to come out. If water is coming in and the roof can't be fixed right away, Vantage Roofing can tarp or temporarily seal it to protect your equipment and stock until the permanent repair is done.
Do I need a permit to re-roof a commercial building in Austin?
For a re-roof or retrofit, yes. The City of Austin's commercial permit for exterior updates includes re-roofing, and nearby cities like Round Rock and Georgetown have their own rules. Vantage Roofing will tell you during the inspection whether your job needs a permit and what the city will look for.
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