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COMMERCIAL ROOF REPLACEMENT

Black Metal & TPO Commercial Roof Replacement in South Congress, Austin TX

An aging, heavily patched asphalt roof was replaced with black metal and TPO—and tear-off revealed $4,500 in necessary decking repairs.

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Roofing contractors in Austin, TX
Years
20 +

Why Austin Homeowners Choose Driftwood Builders Roofing

We’re not a franchise. Not a storm chaser. We’re a family-built roofing company that has called Central Texas home for over 20 years — and we’re still here because we do the job right.

Flat, dark rooftop with several puddles reflecting the cloudy sky and surrounding trees; power lines cross the scene.

Project Overview

Driftwood Builders Roofing completed a commercial roof replacement near South Congress in Austin, Texas. The existing sloped roof used aged asphalt shingles with extensive granule loss, exposed asphalt, roof cement, and repeated patching. The low-slope section also showed standing water and an older roof surface that required replacement.


The original $18,000 scope included tear-off, new roofing materials, complex installation work, a black metal roofing system on the sloped areas, and TPO on the flat section. Once the old roof was removed, the crew discovered widespread rotted and open decking. Correcting those concealed conditions added $4,500, bringing the final project investment to $22,500.


The finished roof combines clean black metal panels with a dedicated TPO system for the low-slope area. The project also included integration of rooftop penetrations and ventilation, cleanup, and final quality-control review.

Project Details

Black Metal & TPO Commercial Roof Replacement in South Congress

Detail Info
Roof type Mixed-slope commercial roof
Sloped sections Black exposed-fastener metal roofing
Low-slope/flat section TPO membrane roofing
Issue found before repair Heavily patched asphalt, standing water on low-slope area
Issue found during tear-off Rotted/open decking
Original scope $18,000
Hidden decking repair +$4,500
Final project total $22,500

Why This Austin Commercial Roof Needed Two Different Roofing Systems

This South Congress commercial property required two distinct roofing systems because the building itself has two different roof geometries — sloped sections and a low-slope section — and no single membrane or panel system performs equally well across both.

The existing roof had been heavily patched with asphalt over the years, and the low-slope area was holding standing water, a clear sign the original system could no longer shed water effectively in that zone. Driftwood Builders Roofing addressed this by matching each roofing material to how water actually moves across that part of the structure.

Sloped roof sections received black exposed-fastener metal roofing. On a pitched surface, water runs off quickly by gravity, so an exposed-fastener metal panel system provides durable, cost-effective weather protection where drainage isn’t a concern.

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The low-slope/flat section received a fully-adhered TPO membrane. Low-slope roofs don’t shed water at the same rate, so standing water can sit on the surface for extended periods. A seamed metal panel system isn’t designed for that kind of prolonged water exposure, but a heat-welded TPO membrane creates a continuous, fully sealed waterproof barrier that’s built specifically for low-slope and flat-roof drainage conditions.

What Is the Black Tar on an Older Austin Roof?

ROOF CEMENT AND REPEATED PATCHING

WHY WAS SO MUCH BLACK ROOF CEMENT VISIBLE?

Black roofing tar is commonly roof cement used around penetrations, seams, flashings, and temporary repairs. It can be useful when applied correctly for a suitable detail, but widespread surface application often indicates repeated attempts to manage deterioration or water entry. It is not a permanent substitute for sound decking, correct flashing, and a roof system suited to each slope.

Open hole in a damaged roof with exposed wood and torn underlayment; a sneaker rests at the edge nearby.

ROOF REPLACEMENT COST

Why the Roof Was Replaced

The before-condition photos show an asphalt roof near the end of its practical service life, with widespread granule loss, exposed asphalt, aging accessories, and extensive roof-cement repairs. These visible conditions supported full replacement rather than another isolated patch. Tear-off was also necessary to evaluate the roof deck and create a reliable foundation for the new systems.

Scope of Work – Metal and TPO Roof Replacement

The completed roof replacement scope included the following work:

Why Rotted Decking Added $4,500

Decking is the structural surface beneath the visible roofing. Existing shingles and underlayment can conceal moisture-related deterioration, open holes, and weakened wood. On this project, those problems became clear only after tear-off. Installing a new metal or membrane roof over unsound decking would have compromised fastening, transitions, and long-term performance, so the damaged areas had to be corrected first.

The decking work was a documented hidden-condition change of $4,500. That addition increased the original $18,000 roof scope to a final project investment of $22,500.

Person wearing a pink shirt and jeans walks along a rooftop with corrugated metal panels, city streets and trees in the background.

Can a Roofer Know How Much Decking Is Rotten Before Tear-Off?

Not always. Roof shingles, membranes, underlayment, and other roofing materials can conceal the condition of the roof deck, so some rotted or deteriorated decking may not become visible until the existing roofing system is removed during tear-off.


On this Austin commercial roofing project, the original contract was $18,000. Once the existing roof was removed, concealed rotted and open decking was discovered and required $4,500 in additional decking repairs. The final project investment was $22,500.
This is why an accurate roof replacement estimate can change after tear-off. A contractor can inspect visible areas before construction begins, but hidden decking damage may only be confirmed once the existing roofing materials are removed.

Flat, dark rooftop with several puddles reflecting the cloudy sky and surrounding trees; power lines cross the scene.
Metal standing-seam roof with two circular vents and scattered construction materials along the edge, backed by trees and a clear blue sky.

Why Was TPO Used on the Low-Slope Roof Instead of Metal?

This South Congress property contained both sloped and low-slope roof sections. Rather than forcing one roofing system across areas with different drainage conditions, the replacement was designed around each roof geometry.

Black metal roofing was installed on the sloped roof sections, while TPO membrane roofing was used on the low-slope portion where water drainage and waterproofing requirements differ.

Before Photos

The original commercial roof showed extensive age-related deterioration and repeated attempts to manage problem areas with roof cement and patches.

During Photos – Rotted Decking Discovered

Tear-off exposed widespread deterioration, holes, and unsuitable decking. The low-slope area also showed standing water that reinforced the need for a properly detailed replacement system.

After Photos

The completed sloped roof uses clean black exposed-fastener metal panels with integrated turbine vents. A dedicated TPO system was installed on the low-slope section.

How Much Did This South Congress Commercial Roof Cost?

The original proposal totaled $18,000. Rotted decking discovered during tear-off added $4,500, bringing the final project investment to $22,500.
Project Scope Investment Amount
Tear-off and disposal $1,200
Metal roofing materials, underlayment, and accessories $10,000
Complex roofing installation labor $3,800
TPO replacement on low-slope section $3,000
Original roof-replacement scope $18,000
Rotted decking repairs discovered during tear-off $4,500
Final project investment $22,500

Important Pricing Disclaimer

This pricing applies only to this commercial property and the documented project scope. Roofing costs vary with measured area, access, slope, structural conditions, panel and membrane specifications, rooftop equipment, drainage, permitting, disposal, labor, and conditions discovered during tear-off. The $4,500 decking addition was specific to concealed deterioration found on this project.

What Our Customers Say

We are large enough to get the job done right, yet small enough to provide old-fashioned customer service. What This South Congress Commercial Customer Said (roof inspection and roof repair, in the $18,000–$20,000 range).
J Brown
“What a fantastic company! I did a lot of shopping for a roof replacement for our commercial property on South Congress and Driftwood Builders far and beyond was the most affordable and most attentive.”

How Our Roof Replacement Works

1. Free Inspection & Estimate

We inspect the full roof and assess the shingles, decking, flashing, and ventilation, then provide a free, no-obligation estimate.

2. Honest Recommendation

We tell you honestly whether a targeted repair or a full replacement is the right long-term value for your home, with no pressure.

3. Tear-Off & Installation

After tear-off, we inspect the exposed roof deck and address concealed deterioration before installing the roofing systems appropriate for each roof slope. On this project, black metal roofing was installed on the sloped sections and TPO was installed over the low-slope section.

4. Final Check & Cleanup

We verify flashing, ventilation, and workmanship, complete a magnetic nail sweep, and finish with a final quality-control inspection.

Related Austin Roofing Resources

More on the shingle system, decking work, and insurance process behind this Tarrytown project.

Front view of a white two-story house with a stone facade, sloped roof, and glass doors, set against a bright blue sky and a large tree on the left; pool edge in the foreground.

South Austin Roofing

Trusted South Austin roofing contractor serving Zilker, Bouldin, Travis Heights & 78704 since 2005. GAF Master Elite certified, 4.9 stars, free inspections, no deposit required.

Austin Commercial Roofing

Commercial roofing for Austin businesses — metal, TPO, and flat roof systems built to last. Free photo-documented inspections with remaining roof life reported in writing.

Austin Metal Roofing

Standing seam and exposed-fastener metal roofing installed across Austin, lasting 40–70 years. Reflects heat, cuts cooling costs, and holds up to Central Texas hail and storms.

View of a brown shingled roof with a vent pipe, overlooking a backyard with trees, a circular fire pit, a stone path, and a wooden fence beyond the lawn.

TPO Roofing in Austin

Heat-welded TPO membrane roofing for flat and low-slope commercial buildings in Austin. UV, chemical, and puncture resistant with a fully sealed, leak-proof seam system.

Flat Roof Repair & Replacement

Flat and low-slope roof repair and replacement for Austin homes and businesses. Free inspection identifies leaks, ponding, and membrane damage before they spread.

A large two-story suburban home with multiple brown garage doors, tan tiled roof, and a light stone-paved driveway, viewed from above. Landscaping lines the front yard.

Commercial Roof Replacement

Full tear-off commercial roof replacements with a complete decking inspection included. No deposit required — you pay only after the finished roof passes inspection.

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Roof Decking Repair

Rotted or damaged roof decking replaced sheet-by-sheet at a rate agreed upfront. Every tear-off includes a full decking inspection before new materials go down.

What Do Austin Homeowners Say About Our Roofing Work?

These Austin homeowners share their experience with roof inspections, storm-damage claims, repairs, replacements, and how our team communicated along the way.

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Roofing Tips & Education

Frequently Asked Questions

Can metal roofing and TPO be used on the same building?
Yes. Many commercial and mixed-slope buildings use metal on the steeper roof planes and TPO on the low-slope or flat sections of the same structure, since each material performs best within a specific pitch range.
TPO is heat-welded at the seams, creating a fully sealed membrane that doesn’t depend on pitch to shed water the way shingles or metal panels do. It’s also reflective and resists UV, punctures, and chemical exposure — well suited to Austin’s heat and low-slope commercial roofs.
Not typically. Metal panels rely on slope to shed water; on a flat plane, seams and fasteners are more prone to water intrusion. Flat or low-slope areas usually call for a membrane system like TPO instead.
Cost depends on roof size, current condition, decking condition, and the mix of metal vs. TPO square footage. Driftwood provides project-specific pricing after a free on-site inspection rather than a general estimate.
Project costs are specific to the building and scope of work, so exact figures aren’t published. A free inspection is the best way to get accurate pricing for a comparable project.
What happens if rotted decking is discovered during a commercial roof replacement?
Once the old roofing material is torn off, the exposed decking is inspected. Any sections found rotted, delaminated, or structurally compromised are documented with photos and replaced before new roofing goes down, creating a solid substrate for the new system.
Sometimes there are warning signs — soft or spongy spots underfoot, sagging deck lines, or interior water stains — but decking condition can only be fully confirmed once the existing roofing and underlayment are removed.
It depends on how many sheets need replacing, which isn’t known until tear-off. Driftwood handles this with a per-sheet rate agreed on upfront, so there’s no surprise pricing if rotted sections turn up.
Exposed-fastener panels are attached with screws through the panel face — more affordable upfront but need periodic fastener maintenance as seals age. Standing-seam panels attach with hidden clips under raised seams and no exposed fasteners — higher upfront cost, lower long-term maintenance, and a 40-to-70-year lifespan.
It varies with building size, roof complexity, and whether decking repairs are needed, but most combination metal-and-TPO commercial projects run from several days to a couple of weeks from tear-off to final inspection.

Commercial Roofing Services Near South Congress

Driftwood Builders Roofing provides commercial roof inspections, roof replacement, metal roofing, TPO and other low-slope roofing solutions, decking repairs, ventilation, flashing, and storm-damage documentation throughout Austin and Central Texas. Businesses and property owners in South Congress, SoCo, and ZIP code 78704 can request an inspection and detailed proposal based on site-specific measurements and conditions.

Rooftop with torn shingles and debris scattered across a sloped surface, a man standing near the edge inspecting damage.
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