Commercial Roofing

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National Roofing provides quality commercial roofing services to St. Louis area businesses and property owners.  If your commercial roof is showing signs of aging, leaking or has been impacted by a recent storm – don’t wait for problems to get worse that might have a negative impact on your business.  Call today to schedule your FREE professional commercial roof inspection.   

St. Louis weather can be tough on commercial roofs.  The intense storms, high winds, hail, summer heat, high humidity, snow and winter freeze-thaw cycles can damage flat and low-slope commercial roofs.  What seems like small issues such as seam separation or damaged flashing can lead to bigger issues – leaking ceilings, tenant complaints, damage to equipment and in some cases costly business interruptions. 

As a property owner it is a smart business decision to get routine inspections done, especially in the Spring and Fall after the severe winter weather and Spring and Summer heat and storms.  We know from experience that having these inspections done regularly can save you money in the long run and protect your assets.  

Contact National Roofing today to schedule your FREE roof inspection

Our Commercial Roofing Services

  • Commercial roof replacement and tear-off

  • New construction commercial roofing

  • Flat and low-slope roofing systems

  • Leak detection and repairs

  • Storm, hail, and wind damage inspections and emergency repairs

  • TPO and shingles

  • Roof coatings and restoration systems 

  • Flashing, drains and penetration repairs

  • Commercial gutters, drains, and downspouts

View of a flat white commercial rooftop by National Roofing St. Louis with several air conditioning units installed on metal brackets. In the background, there are neighborhood houses with trees and a red brick chimney visible under a cloudy sky.
GAF Certified Residential Roofing Contractor emblem with red, white, and blue colors for National Roofing St. Louis, a veteran and woman owned local business

After we inspect your roofing system, we will provide a report documenting what we find.  If there is a need for repairs or replacement, we will provide you with detailed information including photo reports and transparent pricing.  If your commercial roof damage was a result of storm damage we will work directly with your insurance company and make sure your claim is processed correctly.  

When you hire us, you are hiring a family-owned business that is committed to providing professional, quality installation that will last.  National Roofing will be there before, during and long after we’ve installed your roof.

COMMERCIAL ROOFING
A St. Louis Business Owner’s Guide

Are you wondering if recent storms, leaks in the building or increased maintenance costs mean it’s time for a new roof or can it simply be repaired. We hope this guide will help you as a business owner or property manager identify the warning signs of a damaged roof and know when to call National Roofing for a FREE roof inspection. 

Signs Your Commercial Roof May Need Replacement

What to look for on the roof

  • Cracks, blisters, or bubbling in the membrane

  • Open seams or membrane edges separating

  • Ponding water (standing water after 48 hours)

  • Exposed insulation or deteriorated cover board

  • Rusted or loose metal edging and flashing

What to look for inside the building & structural warning signs

  • Water stains on ceilings or walls

  • Mold or mildew odors

  • Leaks dripping during or after storms

  • Damaged ceiling tiles or insulation

  • Rust around rooftop equipment

Other things to consider 

  • Many commercial roofs last 15–30 years depending on the type of material used

  • Older roofs often have problems hidden beneath the surface

  • Not performing regular maintenance on your roof will significantly impact how long  it will last

What To Do 

  • If your building has been impacted by storms with hail or high winds in the last 2–3 years → Call for a FREE Inspection

  • If water is pooling on the roof or you have leaks inside → Call for a FREE Inspection

  • If the seams, flashing, or roof penetrations are damaged → Time to repair or replace

  • If the warranty on your roof is running out → Plan ahead and get it inspected

It’s important to call National Roofing Immediately if you have:

  • Water leaks or notice any interior water damage

  • The same area repaired multiple times

  • The protective membrane on your roof is deteriorating

  • Storm or hail damage

  • Safety concerns accessing the roof

As a property owner or manager, it’s important to remember that regular professional inspections can prevent disruptions to your business and costly surprises.

Schedule Your Free Roof Inspection

What our FREE Commercial Roof Inspection Includes:

• An evaluation of your membrane system and the surface of your roof
• Inspection of the seams, flashing and roof penetrations
• Assessment of drainage issues
• Evaluate the condition of the roof deck and insulation
• Identify leaks and source of where the water is coming in from
• Written report with photos
• Complete Storm damage documentation for insurance claims

Star in the center, featuring red, white, and blue colors for National Roofing St. Louis, a veteran and woman owned local business

After the inspection is completed, we will provide clear recommendations as well as next-step options to make sure your property investment is properly protected.

Schedule Your Free Roof Inspection

INSURANCE & STORM CLAIMS
What Business Owners Should Know

  • Immediately document any storm damage

  • Report claims as soon as possible — delays can affect coverage

  • Never sign contracts before a professional inspection is completed

  • Make sure your contractor is licensed and insured

  • Ask if the contractor will work closely with the insurance adjusters and will help with the insurance claim.

National Roofing is a licensed and insured contractor. 

We have helped many businesses in the St. Louis area with their insurance claims – meeting personally with the adjuster and providing the correct documentation to help the claim process to move quickly.  

Commercial Roofing
Frequently Asked Questions

  • At least once per year. In St. Louis, it would be a good idea to get an inspection in the Spring and Fall due to storms, hail, humidity, and freeze–thaw cycles. Be sure and always inspect after major storms and high wind events.

    • TPO / PVC: 20–30 years

    • EPDM: 25–30 years

    • Modified Bitumen: 20–25 years

    • Metal: 30–50+ years
      Maintenance and drainage play a major role in longevity.

  • Repairs may be all that are necessary if damage is minor and limited to a small area, and the roof is structurally sound. However, replacement is recommended when leaks are found in several places, the roof is near the end of its lifespan, insulation is saturated with water, or recurring repairs are needed leading to unnecessary cost.  

  • If the existing roof system is in good shape, applying roof coatings and doing repairs on damaged areas can extend the life of the roof.  If the roof is severely damaged and is causing leaks and moisture issues restoration is not recommended.  

  • • An evaluation of your membrane system and the surface of your roof
    • Inspection of the seams, flashing and roof penetrations
    • Assessment of drainage issues
    • Evaluate the condition of the roof deck and insulation
    • Identify leaks and source of where the water is coming in from
    • Written report with photos
    • Complete Storm damage documentation for insurance claims

  • In most cases, no. We will work closely with you in advance to coordinate the replacement of the roof so we can minimize noise and disruption.  

  • After a storm look for punctures to the membrane and roofs surface, damaged flashing, clogged drains, or interior leaks.  Most damage on commercial roofs is not visible from the ground so it is important to get a professional to come and inspect the roof.  

  • Absolutely!  The first step is having your roof inspected to determine the amount of damage – if that amount is greater than your deductible you will want to file a claim.  We will provide the proper documentation to help determine whether a claim is warranted and we will assist with the claim process if it is.

  • Yes. We will provide you with a thorough report documenting the damage and we will meet with the adjusters to discuss our findings.  We are your advocate during the claims process – we like to think of it as “we work for you”.  We have extensive experience working with insurance companies - ensuring proper repairs are done and making sure your claim is processed correctly is part of our job.   

  • Cost varies depending on roof size, type of roofing system, access, insulation, drainage needs, and scope of work.  After our inspection we will provide you with an itemized estimate so there will be no surprises at the end.  

  • Yes. Most roofing replacement and repairs can be completed while the building remains fully operational.  We take into consideration access planning and safety before we begin the project.

  • Yes. We are fully licensed and insured for residential and commercial roofing, which protects both property owners and occupants.

  • Yes, the condition of a roof is extremely important.  A roof that is in good condition reduces buyer risk, improves energy efficiency and increases overall property value.

What’s the next step?

Call National Roofing and schedule a FREE Commercial Roof Inspection. We provide you with a complete assessment report with no obligation.