238T Metal-over-Metal Roof Recover Systems

McElroy Metal has develop several methods to recover an existing metal roof using the symmetrical 238T standing seam roof system. Available systems include a patented, frame-less Metal-Over-Metal recover option that provides a low cost retrofit solution over existing exposed fastened panels with ribs up to 1.5" tall.  238T recover systems provide a long-term solution to existing exposed fastened metal roofs that have completed their service life at a cost that is competitive with single-ply recover and will last two (2) to four (4) times longer. 

Recent articles and white papers have been published to inform and educate the marketplace about critical engineering considerations that must be made when considering single-ply recover over an existing metal roof.

Comparison of Retrofit Systems Over Existing Metal Roofs

Recovering Existing Roof Systems

Single-Ply Roofs Over Metal

Recover Your Roof! Video 

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Great for

Walls

Walls

Roofs

Roofs

Residential

Residential

Commercial

Commercial

Installation over Exposed Fastener Panels

The thru-fastened recover system is designed to be installed over existing panels up to 1.5" tall, such as R-Panel. The system utilizes tall clips that sit between the ribs of the existing panel and are attached directly to the purlin below. The air space between the two roofs is filled with insulation. 

Additional Information

McElroy Metal frame-less recover systems provide the following benefits:

  • Panels can be manufactured up to 24" wide, onsite, directly onto the roof to eliminate end laps and improve
    installation efficiency
  • Extremely high wind-uplift capacity when attached to purlins 5' o.c., which means no additional corner/edge framing
  • Individual panel removal and replacement capabilities which allows for easier repairs at a later date
  • Very little disruption to building occupant
  • Increase wind uplift capacity of existing roof without additional framing
  • Very little trash/landfill debris generated
  • Decades long service life
  • Direct attachment to the structure without expensive sub-framing
  • Extremely fast installation
  • Up to 100 psf snow load without additional framing
  • Structural diaphragm is not altered

Shown below are the steps of a 238T Metal-Over-Metal recover installation. 

Utilizing McElroy's jobsite production vehicles, roof panels run from eave to ridge, eliminating the need for end laps.
Single length panels offer labor savings and improve weathertightness.

Once the panels are manufactured on the roof, then special die-cut insulation is placed over the existing roof panels.

  • Clips are attached to the structure
  • Insulation is installed between the clips
  • 238T panels are placed on top of the insulation
  • 238T panels are joined together using 238T seam caps 
    and mechanical seamer

Seam caps are applied over adjoining 238T panels.

Note the two beads of butyl sealant in the seam cap that improves weathertightness.

For maximum strength and load handling capabilities, Multi-Span clips can run from eave to ridge as shown on the left. Multi-Span clips are often utilized in critical areas, such as corners, while standard clips are utilized for the majority of the roof. 

For high wind uplift or snow load area, McElroy's Multi-Span clip provides up to -93.5 psf allowable uplift or nearly 100 psf positive with a 24" wide panel installed over purlins 5' on center.



Related Files

CAD Drawings

PDF Drawings

Brochures

Metal Panel Care & Maintenance

Installation Manuals

Retrofit & Recover Systems

Product Approval Report / Miami-Dade Notice of Acceptance (NOA)

Product Approval Report / ICC-ES Approvals

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FAQs

Metal roofing consistently outperforms shingles when it comes to resisting harsh elements. In addition to being fire and hail resistant, metal roofs are also effective against extreme winds. Many insurance companies recognize the durability of metal roofing, offering discounts for structures with metal roofs.

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Thanks to a combination of ASV (Above Sheathing Ventilation) and special coating designed to reflect the sun’s energy and release absorbed heat, metal roof panels can reduce energy costs by as much as 20% compared to asphalt shingles.

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Compared to shingles and clay tile, metal roofing holds up better against hail and extreme winds in addition to being fire resistant. In fact, many insurance companies offer discounted rates to homes with metal roofs because they’re more likely to hold up under harsh conditions.

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With a lifespan of up to 60 years, a metal roof is an ideal long-term solution for residential roofing. Homeowners can rest easy knowing that they won’t need to replace the roof before selling their house or shortly after purchasing a new home.

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While it may be true that metal roofs on buildings like garages and pole barns intensify the sound of falling rain, this is primarily caused by the lack of a roof deck, insulation, and underlayment. On a residential home, layers of building materials between the metal roof and the living area reduce the noise significantly, making metal roofs as quiet as any other roofing material when it rains. Check out this video to see and hear for yourself.

Metal roofing actually reflects much of the sun’s heat and energy. While conventional shingles absorb much of the sun’s heat, metal roofing can actually reduce cooling energy costs by as much as 20%. That’s because the coating used on modern metal roof panels incorporates special pigments that reflect the sun’s energy and release heat that is absorbed throughout the day.

The odds of a lightning strike hitting a metal roof are the same as any other roof, regardless of material. In the event that there is a lightning strike, however, metal roofing will not ignite and catch fire since it is not combustible.

Far from it. Studies conducted by the Insurance Institute for Business & Home Safety (IBHS) have found that metal roofing is far less likely to be punctured by hail than conventional asphalt shingles, withstanding even golf ball-sized hailstones with only cosmetic damage.

Metal roofing consistently outperforms shingles when it comes to resisting harsh elements. In addition to being fire and hail resistant, metal roofs are also effective against extreme winds. Many insurance companies recognize the durability of metal roofing, offering discounts for structures with metal roofs.

Need a New Roof? How Building Owners Reduce Cost with a Metal Roof
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