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Flammability
- Like many construction materials, EPS is combustible
and should not be exposed to flame or other ignition
sources. Current model building code requirements should
be met for adequate protection.
Solvent Exposure
- EPS is subject to attack by petroleum-based solvents.
Care should be taken to prevent contact between EPS
and these solvents or their vapors. Use only adhesives
approved for EPS applications.
Ultraviolet Exposure
- Prolonged exposure of EPS to sunlight will cause slight
discoloration and surface dusting, however, insulating
properties will not be significantly affected. If stored
outside, EPS insulation should be protected with a light-colored,
opaque tarp.
Vapor Retarders
in Walls and Foundations - EPS provides high
moisture resistance and low water vapor transmission
but it is not a vapor retarder. Recommended design practices
for walls and foundations should be followed in selecting
vapor and moisture barriers for severe exposures.
Vapor Retarders
in Roofs - Study each roofing application to
determine need for a vapor retarder to control internal
condensation. Based on NRCA/MRCA sponsored studies,
vapor retarder placement is less critical with EPS than
other rigid insulation products.
Exposure/Application
Temperatures - EPS should not be exposed to temperatures
in excess of 170°F for prolonged periods. In hot
asphalt roofing applications, asphalt temperatures should
not exceed 250°F
at time of contact with EPS insulation.
Roof Installation
Practices - Following each day of application,
cover all exposed insulation and temporarily seal from
moisture. Replace or thoroughly dry any wet insulation
prior to applying covering materials.
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