What colors are Polyisocyanurate and polyurethane insulation usually?

Polyisocyanurate and polyurethane insulation are typically characterized by their distinctive light orange or light yellow colors. This coloration is often a result of the chemical composition and manufacturing process used for these types of foam insulation.

The light orange or light yellow hues serve not just as a visual identifier but can also indicate the presence of blowing agents used in the insulation process. These colors are common in insulation boards and spray foam applications, making them easily recognizable on job sites.

Other colors listed, such as dark brown, grey, white, or pale green, do not accurately represent the typical appearance of these specific insulation materials, thereby reinforcing that light orange or light yellow is indeed the correct choice for identifying polyisocyanurate and polyurethane insulation.