Which type of insulation is delivered in cut lengths on site?

The correct type of insulation that is delivered in cut lengths on site is blanket insulation. Blanket insulation typically comes in the form of rolls or batts that can be easily handled and cut to fit specific spaces as needed during installation. This flexibility in application allows for better fitting around obstructions and ensures a snug installation, whether in walls, attics, or floors.

In contrast, rigid insulation is pre-manufactured in solid boards and is generally cut to specific dimensions for installation, which doesn't usually align with the concept of cut lengths provided on site. Spray foam insulation is a type that is applied in a liquid form and expands to fill cavities, so it’s not delivered in predetermined lengths. Batt insulation is often similar to blanket insulation but is specifically designed in pre-cut pieces or batts, which may not always be referred to as "delivered in cut lengths" as they are standard sizes.

Understanding these distinctions helps clarify why blanket insulation is the best choice for this question.