The community of Winchester, Ind., was in desperate need of a new roof for its aging high school. Teachers and students were coexisting in an interior environment that was wet, humid and had a repulsive smell. The school board met with a number of people, including a conventional roof trade association and an architectural firm that specialized particularly in flat roof work.
In January 2008, they elected to go with another flat roof on the high school.
However, the community was split over whether to use another flat asphalt roof or to use a sloped standing seam metal roof. In March 2008, Metal Roof Consultants attended a school board meeting and presented a sloped metal retrofit roof as an alternative to tearing off the existing roof and replacing it with another flat roof. The retrofit metal roofing system allows the existing roof to stay in place and constructing a new roofing system over the top of it.
The challenge
To provide a long-lasting roof that would permanently fix severe leakage issues associated with the existing flat roof on Winchester High School.
The solution
After the presentation by Metal Roof Consultants, it was decided that a retrofit metal roof system would be the best solution for the existing problem. MBCI, the leading manufacturer of metal roof and wall systems, was approved as the supplier for both the framing system and metal roof system for the 108,000-sf project. Smarrelli Construction was chosen to do the installation. The contract price was approximately $1.6 million, slightly less than the original estimate to remove and replace the existing flat roof.
The MBCI NuRoof Retrofit Roof System was installed over the existing roof’s framing members to create a sloped plane. Six inches of unfaced fiberglass insulation were installed directly over the existing roof. This raised the insulating value of the roof from R-3.5 to R-22.5, which provided significant energy savings. It also allowed the existing roof to release its moisture through the glass insulation into the ventilated air in the new roof cavitty.
Once the framing system was in place, a BattenLok HS standing seam metal roof was installed over it. This option allowed school to stay in session while the new roof was installed. The metal roof was an Energy Star qualified Cool Roof color, which, when properly used considering the environment and the slope of the roof, can reduce energy consumption because of its ability to reflect and emit the sun’s energy, providing significant cost savings.
Additionally, this solution eliminated the need to deposit the existing roof into the local landfill, which recent statics show that 7 to 10% of U.S. landfill space has gone to roofing waste over the last 40 years (ADPSR 1998-2007 Corps of Engineers Study). Metal roofing also allows for little to no maintenance. The contract price was $1.6 million, less than the original estimate to remove and replace the existing flat roof. MBCI also guarantees that the roof will not leak for a minimum of 20 years.
The retrofit system
The NuRoof Retrofit Framing System utilizes light-gauge (16 ga. to 12 ga.) steel framing, which is installed directly over the existing roof’s framing members to create a sloped plane. Regardless of whether your roof substrate is steel, wood or concrete, MBCI’s NuRoof system can be employed to satisfy the building owner’s requirements. MBCI has the experience required to design the retrofit framing system that will comply with the original load requirements of the existing roof.
The existing roof’s physical footprint, framing system and other rooftop conditions will most likely control the new roof’s geometry. A low-slope application (¼:12 to 2:12) is typically driven by economy and designed to discharge rainwater from the roof. High-slope applications (greater than 2:12) are also designed to improve and update the look of an existing building in conjunction with improving the performance of the roof.
Once a NuRoof framing system has been installed, one of MBCI’s standing seam metal roofs is typically installed, creating a ventilated attic space.
Standing seam metal roof systems
MBCI offers two types of standing seam metal roof systems--vertical leg and trapezoidal--which are of the most durable and weathertight roof systems available in the industry. Both systems can be used for new construction or retrofitting an existing building.
The vertical leg standing seam roof panels from MBCI blend the aesthetics of an architectural panel with the strength of a structural panel. These panels have earned several UL uplift ratings, assuring the reliability of performance. They also provide flexibility to meet design challenges. Each of these systems is designed to be installed over open framing. BattenLok HS is a vertical leg system.
Trapezoidal standing seam panels are available as a snap-together system or field-seamed system. They allow for strength, durability and weatherability. The standing seams are three inches above the lowest part of the panel, well above the water level as it flows off the roof. With a recommended minimum slope of ¼:12, the trapezoidal systems can be used on all types of construction, including metal, masonry or wood. +
Related Stories
GIANTS 19 PREMIUM | Dec 23, 2019
Top 90 Sports Facilities Architecture Firms for 2019
Populous, HKS, HOK, Gensler, and HNTB top the rankings of the nation's largest sports facilities sector architecture and architecture engineering (AE) firms, as reported in Building Design+Construction's 2019 Giants 300 Report.
| Dec 18, 2019
Reconsidering construction robotics
After decades when experts predicted that robots would become more prevalent on construction sites, it would appear that the industry has finally reached that point where necessity, aspiration, and investment are colliding.
75 Top Building Products | Dec 16, 2019
Top Window and Door Products for 2019
Pella’s Rolscreen retractable screen and NanaWall’s HSW single-track sliding glass wall are among the 16 window and door products to make Building Design+Construction’s 2019 101 Top Products report.
75 Top Building Products | Dec 16, 2019
Top Structural Products for 2019
Inpro’s Fireline 140 fire barrier and Owens Corning’s Foamglas cellular glass insulation are among the 10 structural products to make Building Design+Construction's 2019 101 Top Products report.
75 Top Building Products | Dec 16, 2019
101 Top Products for 2019
Building Design+Construction readers and editors select their top building products for the past 12 months in the fourth-annual 101 Top Products report.
75 Top Building Products | Dec 16, 2019
Top Plumbing Products for 2019
Sloan's CX Flushometer and Zip Water's HydroTap are among the eight plumbing products to make Building Design+Construction's 2019 101 Top Products report.
75 Top Building Products | Dec 16, 2019
Top Interior Building Products for 2019
Arktura's Delta Drop ceiling and CertainTeed's Decoustics Rondolo wood panels are among the 13 new interior products to make Building Design+Construction's 2019 101 Top Products report.
75 Top Building Products | Dec 16, 2019
Top Glass and Glazing Products for 2019
SageGlass's Harmony dynamic glass and Vitro Architectural Glass's Acuity low-iron glass are among the nine new glass and glazing products to make Building Design+Construction's 2019 101 Top Products report.
75 Top Building Products | Dec 16, 2019
Top Flooring Products for 2019
Tarkett’s aviation-inspired flooring collection and J+J Flooring’s textile composite flooring are among the four new commercial flooring products to make Building Design+Construction’s 2019 101 Top Products report.
75 Top Building Products | Dec 16, 2019
Top Building Systems Products for 2019
FabricAir’s ceiling-hung fabric duct and Ellumi Lighting’s bacteria-killing lights are among the 13 new building systems products to make Building Design+Construction's 2019 101 Top Products report.
