Over time, metal standing seam roofing systems can rust, corrode and develop leaks around joints and fasteners. These conditions create an unsightly roof with weakened hold down fasteners and open metal seam. Typically, leaky standing seam roofs are patched with caulk, tape or coatings. These often is only short-term fixes with a warranty covering materials only with no labor coverage past a few short years. Many times, this becomes the cost of maintenance instead of an investment in the building structure.
Standing seam metal roofs have two categories of roof designs hydrokinetic and hydrostatic. Hydrokinetic roof systems are generally 3:12 slope minimum and shed water easily. Hydrostatic standing seam metal roofs with architectural panels that slide or snap together with trapezoidal panels seamed mechanically designed to be waterproof. With years of wind vibrations and metal deterioration they are reduced to water shedding. Water infiltration into the roof system and building is caused by water running in or be sucked into seams or other voids. This condition may Cause more damage to the roof panels and structural supports. Due to the roof panel movement and deterioration patched with caulking, tape or coatings do not weather well.
The installation of a Single-ply Membrane Metal Retrofit Systems re-cover on an existing standing seam metal roof over metal buildings is a very viable solution with options to get a return on investment. There are millions of square feet of this type of system installed every year with the proper engineering and design. It’s relatively quick, an immediate esthetic improvement eligible for a (NDL) no-dollar-limit 15- or 20-year warranty. The NDL warranty covers material and labor and it’s relatively inexpensive.
Contact your preferred roofing contractor for their metal roofing solutions. The metal standing seam single-ply retrofit solutions have the capabilities to be installed directly over a worn metal roof. They also provide the opportunity to install insulation which can improve the overall energy efficiency of the building providing even more payback on investment of the project.
One option is a mechanically fastened membrane system incorporating a 45 or 60-mil reinforced EPDM or a TPO membrane. Rigid polyiso insulation is used to fill between standing seam ribs matching the height of the ribs. A top layer of insulation is mechanically secured through both layers and into the existing metal roof. A coverboard is recommended (not required) to installed over both layers of insulation. When coverboards are used all three layers can be simultaneously fastened. The EPDM membrane is secured to the metal structural purlins in the field of the roof and at all perimeters.
Another option is a fully adhered membrane system also incorporating a 45 or 60-mil reinforced nonreinforced EPDM or TPO membrane. A 60-mil non-reinforced EPDM membrane can be used. Rigid polyiso insulation is used to fill between standing seam ribs matching the height of the ribs. A top layer of insulation is mechanically secured through both layers and into the existing metal roof. A coverboard is recommended (not required) to installed over both layers of insulation. When coverboards are used all three layers can be mechanically fastened at one time. The EPDM membrane is fully adhered to the top insulation board or coverboard as required.
With the proper roof membrane, design, assembly, and installation an accidental puncture and hail damage rider in the warranty may be provided. Required enhancements including additional perimeter membrane sheets or increased fastening density for increased warranty duration or wind speed coverage greater than 80 MPH may also be provided.
Don Fusselman, Director of Operations
8600 E. Market St. Suite #4 | Warren, Ohio 44484
Tel 330.856.2500 ext. 103 | Mobile 330.442.2404