138T Metal Over Shingle System

McElroy Metal’s 138T Shingle Recover System provides a long-term and economical solution for commercial building owners and homeowners in need of a new roof. This innovative system installs directly over existing shingles and the patented clips create an energy saving Above Sheathing Ventilation (ASV) airspace between the existing roof and new 138T roof.

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No Tear-Off or Underlayment Required 

As long as the deck is serviceable, there is no need for the added expense and hassle of removing and disposing of the existing shingles (check with your local code authority to determine if one or two layers of shingles are allowable for recover). Also, there is no need for the added expense of an underlayment with the 138T Shingle Recover System. 

138T Recover Clip 

Clip alignment is the key to proper installation of a standing seam recover over shingles. The patented 138T clip is long enough to sit on two shingles simultaneously. This feature aligns the clip into the plane of the roof. The clip also holds the panel up 3/4" above the existing roof. Even with this 3/4" gap, the panels are walkable without causing damage. The system also features vented eave and ridge components, which when combined with the 138T clip, enables uninterrupted airflow between the existing and new roof.

Above Sheathing Ventilation (ASV) 

Utilizing air space to help reduce heat transfer is not new. Testing Laboratories have documented that a free flowing air space between a metal roof and shingles can reduce heat transfer by 25%. Up until now, the common method to provide ASV was to install a series of vertical and horizontal framing members which greatly increased material and labor expense. The 138T Shingle Recover clip eliminates all framing and allows unencumbered airflow in all directions. Although this recover system was designed for retrofit applications, it is equally suitable for new construction.

The patented 138T Shingle Recover Clip is installed with two fasteners into the existing substrate and allows for a 3/4" airspace between existing and new roofs.
Each clip is seated on two shingles with fasteners through lower ends of the shingles.
Corrugated sheeting installed at the ridge allows for continuous air flow between the existing and new roof while providing support for the panel and closure.

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Technical Bulletins / ASTM E1592 Uplift Tests

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While the upfront costs of installing a metal roof are often higher than shingles, a metal roof lasts longer and will be replaced or repaired far less frequently. A typical shingle roof lasts anywhere from 12 to 20 years, depending upon how well it’s maintained and weather elements it may encounter. Metal roofs, on the other hand, can last between 40 and 60 years while also requiring less maintenance, making them a more cost-effective choice over the lifespan of the roof.

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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.

Residential metal roofing is available in a variety of aesthetically pleasing designs that can heighten the curb appeal of any home. In addition to conventional panels, there are several styles that are virtually indistinguishable from conventional tile and shingles. Metal roofing is available in a wide array of colors as well, making it easy to find an option that best suits any style of residential home.

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.

Definitely not! Like most building materials, metal roofing is available in varying levels of quality. Homeowners should be sure to ask their contractor or supplier what substrate and paint coating they are recommending for their home. Galvalume steel substrates and Kynar 500® (PVDF) coatings provide the best long-term peformance. Click here for facts about substrates and coatings.

Need a New Roof? How Building Owners Reduce Cost with a Metal Roof
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Find a Distributor/Contractor Near You

Whether you’re building a new home or planning renovations, a metal roof can deliver long-term cost savings and comfort. To explore your options and find the product that meets your aesthetic and budgetary needs, contact a McElroy Metal distributor or contractor in your area today. We can’t wait to help make your dream home a reality.

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