Metal Roofing

A standing seam metal roof installed with Galvalume steel panels and Kynar 500 PVDF coating has a documented service life of 40 to 70 years. The steel substrate does not degrade like organic membranes, and PVDF coatings carry manufacturer warranties of 40 years for chalk and fade. The main maintenance requirement is periodic inspection of sealants at penetrations and fastener checks on through-fastened systems. For building owners who want to eliminate re-roofing cycles from their maintenance schedule, metal is the only commercial system that delivers that outcome.

Kynar 500 is a PVDF (polyvinylidene fluoride) resin-based coating applied to metal panels at the factory. It provides exceptional resistance to UV degradation, chalking, fading, and chemical attack, far beyond standard polyester coatings. Manufacturers back Kynar 500 panels with 40-year warranties for chalk and fade. If you're specifying metal roofing for a commercial building and the spec doesn't call for Kynar 500 or its equivalent (Hylar 5000), you're accepting significantly lower color retention and durability.

Standing seam panels use concealed clips that allow the panel to expand and contract thermally without stress, and fasteners never penetrate the membrane face, eliminating the primary leak path. Through-fastened panels use exposed screws through the panel face, which are subject to thermal cycling and eventual sealant deterioration. Standing seam is the premium standard for commercial roofing and carries longer warranties. Through-fastened is appropriate for steep-slope applications, agricultural, and light industrial where cost is the primary driver.

On a lifecycle basis, metal is often the lowest-cost option for owners with a 20+ year time horizon. A membrane roof will typically need replacement within that period, while a metal roof lasts 40 to 50 years with minimal maintenance. For building owners who intend to hold the asset long-term, metal can eliminate one or more future re-roofing cycles, each with its own tear-off and disposal.

Yes, in many cases. A standing seam system can be installed over an existing flat or low-slope roof using a structural subframe, effectively converting the roof geometry and eliminating the need for tear-off. This approach requires structural assessment to confirm the building can handle the added load, but can be a cost-effective solution that avoids tear-off disposal costs while delivering 40+ year performance. We assess each situation and provide a cost comparison if this is a viable option.