Massive High School Re-Roofing Addresses Urban Heat Island Concerns

Martin-Tomlinson Roofing Company recently re-roofed 195,000 square feet of the Marcus High School campus. Photos: Johns Manville

Marcus High School is one of more than 65 facilities that comprise the Lewisville Independent School District (LISD). Located north of the Dallas/Fort Worth International Airport, the massive127-square-mile district serves more than 53,000 students. Over a decades-long partnership, Johns Manville and Martin-Tomlinson Roofing Company (M-T) have built a great track record with LISD and have completed dozens of roofing projects for the school district together.

On this project, the roof systems were replaced on several attached buildings with a roof area totaling approximately 195,000 square feet. This massive project covered only half of the Marcus High School campus, and there were very few places where M-T had flat surfaces to work on. With the client requiring minimal disruption to students, most of the work was completed over summer break. Then, exceptional care was taken once school was back in session to keep students and faculty apart and safe from the jobsite where M-T’s 10-man crew continued to progress.

The new roof also needed to be highly reflective and compliant with the International Energy Conservation Code, as required in the southern United States. The heat island effect is a concern under the relentless Texas sun.

The New Roof System

After evaluating the roof, Martin-Tomlinson and a third-party roofing consultant determined that some of the existing insulation could be left in place and that the tear off only had to go down to the cover board — not down to the roof deck, a few inches below. Salvaging existing insulation benefited the school financially, and it is better for the environment since fewer materials had to be discarded and replaced. Additionally, not removing those additional inches from the roof saved time, which lowered the installation cost for the school district. Before starting the tear off, specialized equipment was brought in to remove loose gravel to create a clean working surface. Then, the existing four-ply built-up roof was removed.

The two-ply SBS heat-welded modified bitumen roof system from JM features a highly reflective surfacing to help minimize the heat island effect. The new roof is Energy Star certified.

The updated roofing system is a two-ply JM SBS heat-welded modified bitumen roof system with highly reflective surfacing. JM ENRGY 3 polyiso roof insulation and DensDeck cover board were applied with JM RS Urethane Adhesive low-rise foam. The roof was covered with the SBS roofing system, which consisted of one-ply each of JM DynaWeld Base and DynaWeld Cap FR CR G. Heat island concerns are diminished with the cap sheet, and the roof is Energy Star certified.

M-T Vice President Jesse Byrd credits the technical knowledge of his JM sales rep and the outstanding service of his JM support person with the success of this job. “I never needed to call technical support with questions,” he says. “I went right to Joel Lewallen, the most knowledgeable roofing guy I know, and I know lots of them. We never had to stop work waiting on materials. JM technical representative Andy Austin was always available for support and he made sure we could keep working.”

TEAM

Roofing Contractor: Martin-Tomlinson Roofing Company, Dallas, Texas, www.m-troofing.com

MATERIALS

Modified Bitumen Roof System: DynaWeld Base and DynaWeld Cap FR CR G, Johns Manville, www.JM.com

Insulation: ENRGY 3 Polyisocyanurate, Johns Manville,

Cover Board: DensDeck, Georgia-Pacific, www.buildgp.com

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