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Dow commissioned SmithGroup, a nationally recognized architectural and engineering firm, to perform an economic evaluation of cost considerations relative to PMR employing STYROFOAM™ Brand XPS Foam Insulation in conjunction with a high-quality fluid-applied waterproofing system.
The following building types were evaluated for three different geographic regions (Minneapolis, Phoenix and Atlanta):
- Two-story government office building – gross roof area of 12,000 ft2
- Three-story university lab – gross roof area of 14,000 ft2
- Three-story hospital – gross roof area of 36,000 ft2
The following roof systems were included in the study:
||Anticipated Service Life|
|1. Fully adhered 60-mil EPDM thermoset rubber membrane, on concrete roof deck||18 years|
|2. Built-up asphalt membrane on concrete roof deck, with gravel or slag surface||24 years|
|3. Hot rubberized asphalt PMR (with STYROFOAM™ Brand XPS Foam Insulation) on concrete deck||39 years|
|4a. Fully adhered 60-mil PVC thermoplastic membrane, on concrete roof deck||20 years|
|4b. Fully adhered 60-mil PVC thermoplastic membrane, on steel roof deck||20 years|
The study revealed that the PMR system provides the lowest life cycle cost1 on a yearly basis (between 6 percent and 22 percent less) per square foot of the five roof systems evaluated. This was true for all three building types and all three geographic locations.
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1 Cost estimates assume 15% general conditions, overhead and profit, in addition to roof contractor's price. Pricing prepared utilizing Means Building Construction Cost Data as the primary information source, with some modifications as suggested by a reputable roofing contractor.