Huebert Fiberboard Roof Insulation

thermal resistance factor

r factor**



3/4" 2.08



1 1/2" 4.17
2" 5.26


Huebert Fiberboard wood fiber insulation board can be used in conjunction with various single ply membrane systems.  The individual manufacturer of each system must approve of the intended use of our product as a substrate.  There are many different single ply systems, and each system has its own specific requirements and needs.

insulation value

c factor*



3/4" .48
1" .36
1 1/2" .24
2" .18


Huebert Fiberboard wood fiber insulation can not be exposed to an open flame (torched on system).  Huebert Fiberboard roof insulation makes a good substrate insulation in re-roof situations, providing the existing roofing or insulation is clear of debris, fairly level, and moisture free.  Huebert Fiberboard roof insulation must be dry when it is used on a roof.

Manufactured in 2' x 4', 4' x 4' and 4' x 8' sheet sizes with thicknesses of 1/2", 3/4" and 1" homogeneous and laminates of 1 1/2" and 2".  All edges are butt.

  * Use Huebert Fiberboard roof insulation for flat roofs on homes, commercial buildings and warehouses.

*** Check with FM or UL on exact approvals and specifications, and listings applying to this product since the roofing industry is in a constant state of change.

** The reciprocal of conductance (C), film conductance (F), or air space conductance (A).  R is a measure of the ability to retard heat flow rather than ability to transmit heat.  

* C Factor is the number of BTU that will flow through one sq. ft. of the given thickness of material with one degree Fahrenheit difference from one side of the material to the other.

Meets ASTM C208-95 Grade 1

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