Metal roofs are attractive and come in a broad spectrum of  colors and designs. Metal roofs are low maintenance, long lasting, resist  decal, discoloration, and mildew. Metal roofs have excellent performance in  wind resistant, water, snow, and ice shedding. In some cases, metal is hail  resistant and an energy efficient option.

Standing Seam

All fasteners on standing seam panels are installed  underneath the system and are not expose to the elements. There are many  different profiles that can be utilized in this system.

  • Snap Lock – Product is designed to snap together locking  panels in place.
  • Seamed – Seams are mechanically folded together using a  seaming machine.
  • Batten – Folded strips that are installed over the top of  each standing seam.
  • Panel Systems.
  • “R” and “M” panels are exposed fastener  corrugated panels which are used for metal roof, wall, soffit, fascia, mansard,  liner or equipment screens. Each features 36″ wide coverage and may be  applied over open framing.

Retrofit Systems

Retrofit Roofing Systems convert worn-out flat roofs into  aesthetically pleasing and highly functional new roofs. Utilizing McElroy Metal  sub-structural members, contractors create a slope into the new roof that will  accommodate McElroy roofing panels.

Installing a metal roof retrofit system provides you with  the following benefits:

  • Energy efficiency
  • Decades long service life
  • An aesthetically pleasing appearance
  • An easy integration with solar panels
  • Reduced maintenance
  • Lower life-cycle cost
  • Stone Coated Steel

As the original stone coated steel roofing system, the  DECRA® product line represents a perfect blending of over 50 years of research  and practical experience. Offering the ultimate in performance and engineering  design is what DECRA Roofing Systems are all about. Stone Coated Steel products  are unique. Stone coated and pressed into different profiles, DECRA products  offer texture and style not found in traditional metal roofing products.

As a substrate, steel provides the perfect medium for  pressing panels to resemble various conventional materials: asphalt shingles,  clay tiles, concrete tiles, and wood shakes. However, unlike conventional  products, stone coated steel is lightweight, durable, freeze/thaw resistant,  allows for walking, and requires little to no maintenance over the life of the  roof.

Metal panel roof system description

There is only one category of metal roof systems used in low-slope applications — structural metal panel.   Structural metal panel roof systems can be used for low slope roofs because of their hydrostatic, or water barrier, characteristics. It is important to note   structural metal panel roof systems can be used for steep slope roof assemblies also.
Most structural metal panel roof systems are designed to resist the passage of water at laps and other joints, as sealant or anti capillary designs   can be used in the seams. Structural metal panel roof systems possess strength characteristics that allow them to span supporting members.

Roof deck

Structural metal panel roof systems are installed over   a large variety of substrates. There are two general categories of substrates:   one is continuous or closely spaced decking that provides solid support for the metal roof panel, and the other is composed of spaced structural supports (such   as purlins) where the metal panels must span between supports. Most structural metal panels are used over spaced structural supports without being supported by   a solid roof deck.


Underlayment (or “felt paper” as it is frequently called) is installed over the roof deck before the application of a metal panel roof system. An   underlayment performs two primary functions: it provides temporary weather protection until the metal panel roof is installed, and it provides a secondary   weatherproofing barrier if moisture infiltrates the metal roof panels. Underlayments typically are not used with structural metal panel roof   systems when intermittent supports are used to carry the roof systems.

Vapor retarders, insulation and ventilation

Condensation should   be expected to develop on the undersides of metal roof panels. Careful   consideration should be paid to vapor retarder, insulation and ventilation   issues. Because every building is in some way unique, building owners and   designers may need to consult moisture-control specialists.