The Roofing Resource Blog

What Duro-Last Roofing Is

Mon, Jan 26, 2015 @ 10:29 AM | Perry

Duro-Last roofing is a rubberized roofing membrane designed for use in commercial, industrial, and residential roofing applications. The membrane is formed by laminating scrim (threads for re-enforcement) between two layers of PVC or poly vinyl chloride. The result is a tough and durable flat roofing membrane that when installed correctly it will keep a building or structure water tight for either 12, 20, or 25 years

1. Where is Duro-Last used?

durolast-layersDuro-Last is a very versatile product and performs well in a variety of commercial settings such as restaurants, commercial buildings and shopping centers, schools and hospitals. Duro-Last is usually installed on roofs that are low slope with very little pitch or completely flat. It is used in new construction but more commonly used in re-roofing projects because of the lay over technology that drastically cuts cost of the new roof and speeds of the installation time. Duro-Last can also be installed over top of buildings with metal roofs as an alternative to metal roof coating.

2. Membrane Thickness and Warranties

Duro-Last is sold to its group of certified dealers/installers by sq. ft. and the price per sq. ft. is determined by the thickness or mil. of the membrane. The most common mil or thickness of Duro-Last is 40  mil but the membrane also comes in a 50 mil, 60 mil, and 80 mil. The price increases with the mil or thickness not only because it is more material but also because the warranties correspond to the thickness of the roofing membrane being installed. A 40 mil membrane comes with the standard 15 year warranty but 50 mil and 60 mil come with a 20 year guarantee. Flat roofing projects that require 25 year warranty must use the 80 mil membrane and meet additional manufacturer specs before the warranty is issued.

3. Pre-fabrication


Duro-Last is unique among other flat roofing manufacturers because it uses pre-fabricated sheets of roofing ordered to fit the specific roof designs as opposed to using rolls of material that have to be assembled by the roofing crew on the job site. Duro-Last roofing contractors order material to "fit" each job and therefore reducing the amount of waste and overlap on a roofing project as well as the amount of field seams.

Pre-fabricated or factory fabricated seams in larger sheets of roofing membrane can reduce the field seams done by a roofing crew by up to 85%. The idea being less seams=less potential leaks.

The accessories that accompany a roofing project like curb flashing, stack flashing s, pitch pans, air vents, and drains are also pre-fabricated by Duro-Last.

4. White Roofing

The most common Duro-Last roofing color installed across the United States is white because of its ability to reflect 98% of the sun's rays. The white rubberized membranes are between 50 and 80 degrees cooler than dark or black rubberized roofing membranes. Duro-Last roofing also can be purchased in lighter gray, tan, an asphalt shingle print (for more visible roofs) and a rock print that is made to look like stones when looking down on the roof sections from upper levels or windows of buildings.