Flexible insulation is manufactured in two types:
(1) blanket or quilt
-or-
(2) batt.
Blanket insulation is generally furnished in roll or strips of convenient length and in various widths suited to standard stud and joist spacing. It is obtainable in thicknesses of 2, 3 ½ and 6 inches. The covering on one side may be intended to be used as a vapor barrier.
Batt insulation is made of a similar fibrous material as blanket insulation, but is preformed to a definite thickness, generally 3 ½ or 6 inches, and is in widths to suit 16 inch stud spacing and is in 6 or 8 feet lengths. Batts are supplied with and without kraft paper facing.
Roll insulation comes in an unbroken roll that is designed to be cut to the desired length. This would be ideal for floors and ceilings.
Batt insulation also comes in a roll. While they look similar in the package, Batt insulation is pre-cut to fit wall framing members (such as 8’ high walls). The packaging around the insulation will clearly indicate if it is “Roll” or “Batt” insulation. It will also give the “R” Value.
R 11 – is used for 4” of insulation
R 19 – is used for 6” of insulation
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Roll and Batt insulation come in widths designed for 16” & 24” (on center) walls.
In modern construction, flexible insulation like roll and batt insulation is found primarily in walls and floors. In homes that are over 20 years old, this type of insulation was also used in the attic area.
Today, loose fill insulation (blown) is the primary choice for attic areas. It is much faster to install and it is easier to get into hard to reach areas such as the exterior perimeter of the attic where crawl space is very limited.