Home Service Commercial Roof Retrofits

Commercial Roof Retrofits

A leaking TPO or modified bitumen roof doesn’t always mean total replacement.

Achilles Roofing & Exterior installs GAF Certified Plus re-cover and retrofit systems over qualifying flat and low-slope commercial roofs, adding years of service life while your building stays operational.

Watch How We Deliver Quality

Signs Your Commercial Roof Is a Retrofit Candidate

Isolated Ponding, Not Widespread Saturation

Ponding water confined to low spots near drains — rather than soaked insulation across the field — usually means the deck and insulation are still sound enough for a re-cover.

Aging Membrane, Intact Deck

Chalking, seam fatigue, or UV-brittled TPO after 12–15 Houston summers is common. If a core cut shows a dry, structurally sound deck, a retrofit membrane can go directly over it.

Rising Cooling Costs

A dark, worn membrane absorbing heat instead of reflecting it drives up HVAC run time. A reflective retrofit membrane addresses both the leak risk and the energy loss in one project.

Our Retrofit Assessment Process

How We Decide Retrofit vs. Full Replacement

✔ Core cuts at multiple locations to check deck and insulation moisture content
✔ Infrared or capacitance moisture scan across the full roof field
✔ Drainage and slope evaluation to confirm ponding water can be corrected with tapered insulation

Per National Roofing Contractors Association (NRCA) guidance, a re-cover is generally viable when less than roughly 25–30% of the insulation is wet. Above that threshold, saturated insulation has already lost its R-value and a retrofit won’t stop the underlying deterioration — we’ll tell you plainly if your roof has crossed that line, even if it costs us the retrofit sale.

Built for Houston's Flat-Roof Climate

Why Retrofit Membranes Have to Be Engineered for Gulf Coast Conditions

Houston commercial roofs cycle through 100°F+ summer heat, Gulf humidity, and named-storm wind loads in the same calendar year. A retrofit membrane that isn’t detailed for this climate fails at the seams first.

✅ Fully-adhered or mechanically fastened TPO and PVC systems rated for 100+ mph wind uplift, meeting International Code Council (ICC) commercial roofing provisions
✅ Reinforced flashing at HVAC curbs, parapet walls, and roof penetrations — the most common Houston leak points on aging low-slope roofs

Who Handles Your Retrofit

Houston Commercial Roof Retrofits, GAF Certified Plus

✔ Foreman Edwardo Cano leads our commercial crews with 12 years of experience and roughly 5,000 completed roofing projects across the Houston area
✔ RCAT Member #208834, GAF Certified Plus installer, and BBB A+-Rated business
✔ 5-year workmanship warranty backing every commercial retrofit membrane we install

Achilles Roofing & Exterior serves Houston, The Woodlands, Cypress and more, with a supply yard at 16310 Cypress Bend Drive and an office at 2002 Timberloch Place, Suite 200, The Woodlands. We’re not a storm-chasing outfit that shows up after a hurricane and disappears — we’re local, licensed through RCAT, and available for follow-up service after the retrofit is complete. See related work in commercial roof repair and commercial metal roofing.

Common Questions About: Commercial Roof Retrofits

What’s the difference between a roof retrofit and a full roof replacement?

A retrofit (re-cover) installs a new membrane system over your existing roof assembly once the deck and insulation pass a moisture inspection. A full replacement removes everything down to the deck. Commercial roof retrofits typically cost less and take less time because there’s no tear-off or disposal phase, but they only work when the existing roof structure is still sound.

Will a retrofit disrupt my business operations?

Most commercial retrofit projects in Houston generate far less noise, dust, and debris than a tear-off replacement, since there’s no demolition phase. We sequence work by roof section where possible and can schedule the noisiest fastening work outside peak business hours to minimize disruption to tenants below.

How do I know if my roof qualifies for a retrofit instead of replacement?

We perform core cuts and a moisture scan across the roof field. If wet insulation covers less than roughly 25–30% of the total area and the deck is structurally sound, a retrofit is typically viable. Above that threshold, per NRCA guidance, saturated insulation has already lost its R-value and replacement is the honest recommendation.

Can you add insulation during a retrofit to improve energy efficiency?

Yes. Tapered polyiso insulation is commonly added during a retrofit to correct ponding water and raise the roof’s overall R-value in the same project. This is also the point at which many Houston buildings upgrade to an ENERGY STAR-qualified reflective membrane to reduce summer HVAC load.

Do I need a permit for a commercial roof retrofit in Harris County or Houston?

Most commercial re-cover projects in the City of Houston and unincorporated Harris County require a building permit through the local permitting office before work begins. We pull the required permits and coordinate the final inspection as part of the project, so you’re not managing that paperwork directly.

How long does a commercial roof retrofit take?

Timeline depends on square footage and roof complexity, but most Houston commercial retrofit projects move faster than a full replacement since there’s no tear-off phase. We provide a written project timeline, including weather contingency days for Gulf Coast rain, before work starts.

What membrane types do you install for commercial roof retrofits?

We install TPO, PVC, EPDM, and modified bitumen retrofit systems depending on the existing roof assembly, ponding conditions, and rooftop equipment loads. Each system is detailed at flashings, curbs, and parapets to meet current wind-uplift requirements for the Houston area.

Is a retrofit membrane rated for Houston hurricane season wind speeds?

Yes. Our commercial retrofit systems are installed to meet applicable wind-uplift ratings referenced in the International Code Council’s commercial roofing provisions, and mechanically fastened or fully-adhered based on your building’s exposure and roof geometry.

Does a retrofit come with a warranty?

Every commercial retrofit we install carries a 5-year workmanship warranty from Achilles Roofing & Exterior, separate from the manufacturer’s material warranty on the membrane itself. We’ll walk you through both before the project starts.

How much does a commercial roof retrofit cost in Houston?

Retrofit pricing depends on square footage, membrane type, insulation needs, and existing roof condition, so we quote each project after the on-site moisture inspection rather than a flat number. As a reference point, full commercial roof replacements through Achilles start at $20,000 — Commercial roof retrofits are generally priced below that when the roof qualifies.

What happens to rooftop HVAC units and equipment during a retrofit?

Rooftop-mounted HVAC units, curbs, and conduit runs stay in place. We re-flash and seal around each penetration as part of the new membrane installation, since penetration flashings are one of the most common leak points on Houston commercial roofs.

Do you offer financing for commercial roof retrofit projects?

Yes, GreenSky financing is available for qualifying commercial roofing projects, including commercial roof retrofits, so the cost can be spread out rather than paid as a single lump sum. Ask for financing terms when you schedule your free estimate.

General Company & Process FAQs

About Achilles Roofing & Exteriors

Are you a licensed and insured local roofing company?

Yes. Achilles Roofing is fully licensed, bonded, and insured in the state of Texas. We are a locally owned and operated company based in Houston, proudly serving homeowners across Houston and all surrounding areas. Our commitment is to our community, and we stand by the quality and safety of every project we undertake.
Can I see examples of your past work or speak to previous clients?

Absolutely. We are proud of our work and have an extensive portfolio of before-and-after project galleries. We are also happy to connect with previous clients in the Houston area who can speak to their experience with our team
What makes Achilles Roofing different from other Houston roofers?

We’re roofers, not just salesman. Our reputation is built on honest work, transparent communication, and treating every Houston family we work with like our own. We focus on providing the right solution for your home and budget, backed by robust warranties and a commitment to exceptional craftmanship.
Do you use subcontractors for your roofing projects?

No. We believe in accountability and consistency quality, which is why your roof is installed by our own trained, in-house Achilles Roofing crews. We don’t outsource our work, ensuring that every project meets our high standards from start to finish.
How long have you been in business?

Our leadership team has decades of combined experience in the Texas roofing and storm restoration industry. As a company, we have succesfully completed hundreds of roof replacement and repairs in Houston neighborhoods, building a strong reputation for quality and reliability.

Pricing, Estimates & Financing

What’s your emergency tarp fee?

$300 minimum for a 5×5 area, covering emergency leak protection until permanent repairs begin.
Do you replace skylights?

Yes. Velux skylight replacement is $2,000, double dome is $1,500, and labor/installation-only is $600. All skylight work carries a 5-year labor warranty.
How much does shingle roofing cost per square?

GAF HDZ runs $127.50/square, GAF NS is $109/square, and OC Duration is $127/square. Pricing varies by roof size and complexity — call (832) 888-1666 for a free estimate.
What roofing packages does Achilles Roofing offer?

Three tiers: Good (Builder Grade shingles, 2-year labor warranty, no material warranty), Better (GAF NS shingles, 5-year labor warranty, manufacturer material warranty), and Best (GAF UHDZ shingles, 10-year labor warranty, enhanced manufacturer warranty). Call (832) 888-1666 to find the right fit for your budget.
How much does a new roof cost in Houston?
The cost of a new roof is a significant investment, and the final price depends on several factors, including the size, pitch (steepness), and complexity of your roof, as well as the specific materials you choose.

While every home is unique, we want to provide some general price ranges for a typical 1,500 sq. ft. home in the Houston area to help you budget:
- Architectural Shingles (Most Popular): $5,500 – $8,500
- Impact-Resistant/ Designer Shingles: $9,000 – $14,000+
- Standing Seam Metal Roof: $15,000 – $25,000+
For a More Accurate Quote: Get Your Instant Estimate Now

These are ballpark estimates for planning purposes only. The best way to get a precise and instant quote for your specific property is to use our free instant estimator tool. It uses advanced satelite imagery to measure your roof and provide a detailed, accurate estimate for your replacement and installation.
Do you offer financing options?

Yes, we make it easy to get the roof you need now with the affordable and flexible financing. We have partnered with Greensky® Financing, a leader in home improvement loans, to offer our customers excellent payment options. Through this partnership, qualified homeowners can get a brand-new roof with $0 Down and low monthly payments, starting at just $199/month.

This program allows you to protect your home immediately without the stress of a large upfront payment. You can learn more about the benefits and get pre-qualified in minutes on our financing page.

Learn More About Greensky® Financing.
What is included in your roofing estimate?

We believe in 100% transparency. Every written estimate from Achilles Roofing includes a detailed breakdown of all costs, including materials, labor, tear-off and disposal of the old roof, and thorough site cleanup, You will also receive clear start and completion timelines, payment schedules, and full warranty details. There are no hidden fees.

The Roofing Process

How will you communicate with me during the project?

We believe in constant communication. You will be assigned a dedicated project manager who will be your single point of contact. They will provide daily updates, including photos and progress reports, and are always available to answer your questions via phone call or text.
How do you protect my home and property during the installation?

Your property’s protection is a top priority. Our crews use heavy-duty tarps and protective boards to cover your landscaping, windows, AC units, and driveway. We conduct a thorough cleanup at the end of each day and use magnet sweeps to collect any stray nails or metal debris, leaving your property spotless.
Do you handle city permits and inspections?

Yes, we manage the entire process for you. This includes pulling all necessary permits with the City of Houston or your local jurisdiction and scheduling the final inspection upon completion. We ensure your new roof is fully complaint with all local building codes and manufacturer standards.

Materials & Warranty

Do you install attic or roof vents?

Yes — we install Attic Breeze and Remington Solar vent systems for improved attic ventilation and energy efficiency.
What shingle colors are available?

Builder Grade comes in Brown, Gray, or Black. GAF shingles offer Slate, Weathered Wood, Charcoal, Barkwood, Mission Brown, Hickory, and Pewter Grey.
Why do different roofing options have different prices and warranties?
Your roof is a complete system, and the materials you choose play the biggest role in it’s long-term performance, durability, and the level of protection you receive. We offer several options to ensure we can provide the perfect solution for every home and budget.
- Standard Achitectural Shingles offer excellent value and protection, backed by our 5-year workmanship warranty and solid manufacturer warranties.
- Premium GAF System often include impact-resistant technology and come with enhanced, non-prorated warranty coverage for the ultimate peace of mind.
During your free assessment, our team will walk you through the specific benefits of each option, helping you choose the right balance of performance, longevity, and price for your situation.
What are the best roofing materials for the Houston climate?
Houston’s unique combination of intense sun, high humidity, and severe storms demands durable and well-ventilated roofing systems. We typically recommend:
- Impact-Resistant Shingles: These are designed to withstand hail and high winds, which can often lead to insurance discounts.
- “Cool Roof” Shingles: These reflective shingles can lower your roof’s temperature, reducing your energy bills during hot Texas summers.
- Proper Attic Ventilation: This is critical in our humid climate to prevent moisture buildup and extend the life of your entire roofing system. We always ensure your ventilation is up to code.
What kind of warranties do you offer?
We provide a powerful, dual-layer warranty system to give you complete peace of mind. Your new roof is protected by two separate warranties: one for the installation quality (our workmanship) and one for the materials themselves.
1. Our 5-Year Workmanship Warranty: This is our direct promise to you. For a full five years after your installation, we cover any issues related to the quality of our work. If there’s a problem caused by our installation, we will fix it, no questions asked. This guarantees the quality and skill of our certified crews.
2. The GAF Manufacturer’s Warranty: As GAF Certified roofers, we are able to offer robust warranties direclty from the manufacturer. This warranty protects you against any defects in the roofing materials themselves. Depending on the GAF System you choose, this can include long-term, non-prorated coverage that provides an exceptional level of protection for your investment.
By combining our workmanship guarantee with a top-tier manufacturer’s warranty, we ensure that every aspect of your new roof is covered for years to come.