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Chapter 23 



Table 23-19. — Types, classes, and intended uses of insulation board 

 (U.S. Department of Commerce 1973b) 



Type 



Class 



Name 



Intended use 



II . 

 III. 



IV 



Sound deadening board 



Building board 

 Insulating formboard 



Sheathing: 

 1 Regular-density 



Intermediate-density 



Nail-base 



v.. 



VI . 

 VII. 



VIII 



IX 



Shingle backer 

 Roof insulating board 



Ceiling tiles and panels: 



1 Nonacoustical 



2 Acoustical 

 Insulating roof deck 



Insulating wallboard 



In wall assemblies to control sound 



transmission 

 As a base for interior finishes. 

 As a permanent form for poured-in- 



place reinforced gypsum or 



lightweight concrete aggregate roof 



construction. 



As wall sheathing in frame construction 

 where method of application and/or 

 thickness determines adequacy of 

 racking resistance. 



As wall sheathing where usual method 

 of application provides adequate rack- 

 ing resistance. 



As wall sheathing where usual method 

 of application provides adequate rack- 

 ing resistance, and in addition, exteri- 

 or siding materials, such as wood or 

 asbestos shingles, can be directly ap- 

 plied with special nails. 



As an undercoursing for wood or asbes- 

 tos cement shingles. 



As above-deck insulation under built-up 

 roofing. 



As decorative wall and ceiling 



coverings. 

 As decorative, sound absorbing wall and 



ceiling coverings. 

 As roof decking for flat, pitched, or 



shed-type open-beamed, ceiling-roof 



construction. 

 As a general-purpose product used for 



decorative wall and ceiling covering. 



