Insul-EZ 4x4 Foam Insulation Sheet vs Armacell AP Self-Adhesive Sheet Insulation

The Armacell AP sheet is the stronger pick for most buyers: it is 1 inch thick with an R-value of 4.2, has a 25/50 flame and smoke rating, and covers 12 square feet per sheet. The Insul-EZ sheet is thinner at 3/4 inch with R-3.0 and no published flame rating, but its 4 ft x 4 ft size gives 16 square feet per sheet and fewer seams on large flat jobs. Both share the same -297°F to 220°F range and peel-and-stick backing, so the choice comes down to thermal performance and fire rating versus sheet size.

• Choose the Insul-EZ if you are wrapping large flat or curved surfaces and want fewer seams from a bigger 4 ft x 4 ft sheet.
• Choose the Armacell AP if you need more R-value per inch and a 25/50 flame and smoke rating for a code-sensitive space.