07 21 13 Board Insulation

07 21 13 Board Insulation

Specification Details




8.5" x 11"


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07 21 13

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Board Insulation

Use this CSI 3 part SimpleSpecs™ master specification to specify rigid (board) insulation for use in roof, wall, and floor assemblies.


Board insulation is available in many forms, the most common of which are included in this section, such as Polyisocyanurate, polystyrene, and glass fiber.


Applicable building codes may dictate which types of insulation can be used in certain occupancies. Plastic foam insulations are typically flammable and must be separated from the interior of a structure by a non-combustible material such as gypsum board, while in some occupancies plastic foam insulations may not be used. Check the applicable building code.


NFPA 285 is an assembly test that determines the fire hazard characteristics of an entire exterior assembly rather than just the insulation. All materials used in an NFPA 285 assembly must have been tested and approved for use in an NFPA rated assembly.


The R-value of any insulation that uses a blowing agent, in this case polyisocyanurate and extruded polystyrene, decreases after the insulation is manufactured. Consequently, the R-value for this type of insulation is rated by LTTR – Long Term Thermal Resistance, typically measured 5 years after manufacture.


Related Standard:

National Fire Protection Association – NFPA 285 


Related SimpleSpecs™ master specifications:

07 22 00 – Roof Insulation 



 Board Insulation

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