ThermaCal is the original nail base roof insulation which combines oriented strand board and polyisocyanurate foam. The standard nail base is APA performance rated 7/16" O.S.B. Also available are 5/8" and ¾” O.S.B. or plywood. The sheathing is pre-spaced for thermal expansion. Tongue and groove edges greatly reduce heat loss at joints.
Please see the attached Data Table for available sizes and performance data.
ThermaCal insulation is designed for use with shingle or metal roofing, slate and tile.
ThermaCal® is classified under U.L. as a roof covering accessory (TGDY) per ANSI/UL 790 (ASTM E108) and as a Building Unit (tiar) per UL 1256 for Constructions No. 120 and No. 123.
Codes – O.S.B. is approved by CABO, ICBO, BOCA, SBC, ARMA and the APA as roof sheathing. The foam used in ThermaCal has a Flame Spread Rating of 25. (This numeric Flame Spread Rating is not intended to reflect hazards presented by this or any other material under actual fire conditions). Foam with Factory Mutual Class 1 approval per FMRC Standard 4450/4470 is used.
Plastic foam must be protected from flame on the inside by a suitable barrier. Generally, wood decking or drywall is acceptable and plywood is allowed in certain roofing applications. CHECK LOCAL CODES.
- meets the physical property requirements of HH-I-1971/GEN. The foam meets ASTM C1289-95.
foam insulation is in compliance with:
BOCA - Section 2603.0
ICBO - Section 2602
SBCCI - Section 2603.2
IBC – Section 2603
Note to Specification Writer: Please see attached 3-part specification. This spec is usually placed in Section 07220 (07 22 00). Or, it can be downloaded from our website www.cornellcorporation.com.
Vapor retarders – The designer should determine if a vapor retarder is required between the deck and the insulation. A vapor retarder should always be specified in buildings with high humidity conditions, such as swimming pools.
Catalogs, detail drawings, draft specifications and installation instructions
are available. Call 888-439-6411 or FAX 800-267-8368.
Please see the attached table for a quick selection guide to Cornell’s
roof sheathing and insulation products.
Cornell Corporation has been a leading roof insulation manufacturer since 1954.
In response to the need for nailable insulation above the structural roof deck
in cathedral or vaulted ceiling applications, Cornel Corporation introduced
ThermaCal® in 1979, which started the nail base roof insulation industry.
In response to the shingle manufacturers’ requests for ventilation, we
introduced Vent-Top ThermaCal in 1987. Cornell Corporation – your
ventilated roof insulation specialists!
CORNELL CORPORATION
808 South 3rd Street
P.O. Box 338
Cornell , Wisconsin 54732
Tel: (888) 439-6411
Fax: (800) 267-8368
E-Mail: cornell@cornellcorporation.com
Web site: www.cornellcorporation.com
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