Why Choose PMR Over a Conventional Roof?
Field Studies have shown that a constant temperature can extend the life of the membrane. STYROFOAM™ Brand Extruded Polystyrene Foam Insulation provides excellent temperature control.
PMR (blue line) – membrane temperature remains relatively constant Conventional roof (yellow line) – membrane temperature fluctuates widley.
| PMR Assembly | Conventional Roof Assembly |
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The membrane is placed under the insulation where it is maintained close to the temperature of the interior of the building, reducing damage from excessive heat and freeze-thaw cycles. |
The delicate membrane is left exposed to extreme and often sudden temperature changes. |
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The insulation over the membrane protects it from weathering, the effects of sunlight (ultraviolet radiation), foot traffic and other physical abuse, during and after construction. |
Sustained high summer temperatures can cause breakdown and failure of the membrane over time. Once the membrane has deteriorated, moisture can leak through to compromise the performance of the insulation. |
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PMR systems are compatible with a wide range of membrane types. |
Cold winter temperatures combined with warm sunlight create numerous freeze-thaw cycles, putting tremendous stress on the membrane. |
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Many ballast options are available for use with a PMR assembly, including stone, precast paving slabs, interlocking stone, concrete, or green roof systems. |
The exposed membrane is subjected to the harmful effects of ultraviolet radiation, speeding up its deterioration. |
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The waterproof membrane is installed first, followed by the insulation, allowing year-round construction. It is easy to remove and re-install the ballast (for repair new construction) and the insulation can be reused. |
The exposed membrane is susceptible to physical abuse from foot traffic, routine maintenance and other rooftop activities. |
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