Duro-Last Master Contractor Award for Wisconsin Roofing Inspections

Duro-Last FAQ


Flat Roofing Systems for Commercial and Industrial Buildings

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  • Is a Duro-Last flat roof suitable for my building?

A custom-fabricated, PVC, single-ply commercial roofing system is ideal for any low-sloped or flat roof application. It is easy to install by authorized contractors and requires very low maintenance. The membrane is highly durable, watertight, fire and chemical resistant, highly reflective, and resistant to high winds.


  • Can this system be installed over an existing roof?

Duro-Last membranes are engineered to be laid over other roofing systems like EPDM rubber roofs, metal roofs, and TPO single-ply roofs. It greatly reduces the time spent on the job as well as costs, noise, and mess on the property. However, if the roofing materials have become saturated with moisture, it will have to be removed before a new roofing system can be installed.


  • How is the membrane finished?

The scrim is the backbone to all Duro-Last membranes that makes it strong and puncture resistant. The unique formulation offers two distinct differentiators – a high-quality reinforcement scrim and a performance layer (thickness over scrim). The polyester, anti-wicking, weft-insertion scrim has a thread-per-inch density that is among the highest in the industry. A third tie yarn prevents runs and won’t allow tears to spread.

The thickness over scrim or performance layer is extra thick to make the membranes more durable, providing protection for the exposed surface – where the building needs it the most.


  • Is a white roof really better?

Duro-Last’s white roofing systems are energy efficient. By reflecting up to 88% of the sun’s rays it can greatly reduce your energy costs.


  • How long does the process take?

Depending on the size of the roof, a crew of 4-5 professional workmen can lay 5,000 to 7,000 square feet of roofing per day. For restaurant roofs or flat roofs with tear offs or several penetrations, more time will have to be added.


  • How will the work affect my business?

We can adjust our schedule to work around your peak business hours. Duro-Last is the only manufacturing company of roof materials that offers pre-fabrication of an entire roofing system in a factory-controlled environment which means your roof can be installed with minimum disruptions to your business.  Prefabrication includes the membrane and accessories and up to 85% of the seams can be completed before sending it to the job site. This reliable manufacturing system eliminates most on-site fabrication which could lead to roof leaks.


  • How long does the warranty last?

The commercial and industrial building owner is protected by a 15-year or 20-year full warranty which is transferable.

Duro-Last offers the most comprehensive, industry-leading warranties for unparalleled protection of roofing applications in the commercial property industry. They were the first manufacturers to offer warranties that expressly cover consequential damage to their roofing systems.


  • Will my roof be inspected before it is handed over?

All commercial and industrial roofing projects are field inspected by a Duro-Last technical representative who will grade the roof before issuing an inspection report.  Representatives or building owners are encouraged to attend the roofing inspection and the warranty will only be issued after the roof has been thoroughly inspected.


  • Can people walk on the roof to perform general maintenance or to service HVAC units?

Duro-Last membranes are extremely tough and can withstand normal foot traffic from workers.


  • Is a Duro-Last Roofing System suitable for a restaurant?

They are highly suitable for use in the restaurant industry as they are tough and capable of withstanding grease and chemicals.


  • How easy is it to repair this roofing system?

Maintenance and repairs are quite easy and can be done by professional roofing technicians without the use of heavy equipment.


  • Can I install the roof myself?

For the full warranty to be effective, Duro-Last Roofing Systems should only be installed by authorized Duro-Last contractors such as NCW Exteriors.


  • Is black rubber roofing more durable than a PVC one?

EPDM rubber membranes are made of a type of synthetic rubber. Rubber membranes often fail at the glued seams due to age, improper installation, or freezing in winter conditions. Duro-Last PVC membranes are specially reinforced and hot-air welded rather than simply glued to create super-strong seams that are impenetrable to water.

Duro-Last Flat Roof System on the Waupaca County Courthouse
Duro-Last Flat Roof System Oshkosh, WI
Pelican Lake Boat House Roof After with Duro-Last in White
New London Wisconsin Funeral Home Flat Roof Installation by NCW
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