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When installing in steep asphalt, size must be no larger than 4' x 4'.
- When used in modified bitumen roof systems, do not apply flame directly to Fiberboard insulation.
- Single ply membrane application should follow membrane manufacturer’s instructions.
- Do not use Regular Density, Class-C under adhered single ply roof membranes.
- Koppers does not recommend that Fiberboard Insulation be installed in encapsulated
systems. (See General
Requirements and Considerations, Insulation, line item 5.)
 Return to Regular and High Density Fiberboard Insulation
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