All documents are for U.S. use only unless otherwise indicated.
High-Density Fiberboard Roof Insulation
High-Density Fiberboard Roof Insulation is an insulation board of interlocking natural,
long fibers, impregnated for asphalt moisture resistance and extra strength. The
top face is further treated to reduce the absorption of asphalt.
Strong and rigid.
Increases strength of entire roof.
Excellent dimensional stability.
Withstands normal deck traffic during and after construction.
Excellent bonding to BUR felts.
Good insulating properties.
Resists damage due to rough handling in shipment.
Excellent recover board.
High Density Fiberboard roof insulation can be used directly over structural
roof decks (see chart).
It is also widely used as a separation board over existing roofs in recover installations.
In recover applications, all wet areas of the old roof must be removed. All loose
and protruding gravel must also be removed.
Properly installed, High Density Fiberboard roof insulation is suitable as a cover
board for use under most built-up, modified bitumen and most single ply roofing
Refer to the membrane manufacturer’s current application and specifications manual
for proper installation procedures for fiberboard roof insulation.
Limitations and Potential Fire Hazard
High Density Fiberboard roof insulation is a non-structural,
non-load bearing material.
High Density Fiberboard roof insulation should be stored dry and protected from
the elements. No more insulation should be installed than can be covered completely
with roofing on the same day.
As unprotected fiberboard will burn, fire safety precautions should be observed
whenever fiberboard product is used.
Direct torching of modified bitumen roofing to High Density Fiberboard will present
a fire hazard. DO NOT use under torch-applied modified systems.
Listed by UL, ULC for use under Class A, B, or C Roof Covering. See UL, ULC Inc.
Roofing Materials and Systems Directory for details. Materials will have
UL, ULC labels only when specified on order.
Subject to the conditions of Approval as a roof insulation when installed as shown
in the current edition of the Factory Mutual Research Approvals Guide.
For details, consult current Factory Mutual Approvals Guide. ASTM C208,ASTM C209
and Federal Specification LLL-1-535B, Class E (Canceled 4-18-85), CAN/ULC S706.
WARNING: DO NOT EXPOSE TO OPEN FLAME OR EXCESSIVE HEAT. MAY BURN
IF IGNITED. IF IGNITED, EXTINGUISH COMPLETELY.
NOTE: REPAIR ROOF LEAKS PROMPTLY TO AVOID ADVERSE EFFECTS, INCLUDING