ISO-C1^® Recommended Thickness: Cold Storage Applications

Calculation of insulation thickness can be complex given the number of variables, include operating temperature, wind speed and dewpoint. ISO-C1 polyisocyanurate insulation, for instance, offers increasingly higher insulation values (R-factor) as temperature decreases. Thickness calculations should generally be done or approved by qualified engineers. Industry-standard software (3-E Plus) is available free from the North American Insulation Manufacturers Association. The following table provides representative thicknesses for refrigeration and freezer applications.
TYPE OF SPACE	OPERATING TEMP. °F	THICKNESS REQUIRED (inches)
Coolers	54 to 48	1.2
	47 to 41	1.7
	40 to 34	1.7
	33 to 27	2.2
Freezers (Holding)	26 to 20	2.7
	19 to 13	2.7
	12 to 6	3.2
	5 to -1	3.7
	-2 to -13	3.7
Sharp Freezers	-14 to -25	4.1
	-26 to -37	5.1
	-38 to -49	6.1
	-50 to -61	7.1

ISO-C1® Recommended Thickness: Cold Storage Applications