Batt Insulation

What does Batt Insulation Mean?

Definition of Batt Insulation in Construction:  

batt insulation
batt insulation
Type of insulation that consists of a fiberglass material similar to a blanket. This material can have a vapor barrier of different products attached to the batt of insulation, or the fiberglass batt, can simply be all fiberglass.

This insulation is available in different thicknesses, dependent upon the R values required, as well as different widths. The widths are manufactured to coordinate with the standard, on center framing, of wood or metal studs. A vapor barrier of paper, foil, or other synthetic products, is adhered to one face of the batt insulation.

If a vapor barrier is specified, the vapor barrier is installed facing the warmest side of the structure. For example, in the basement, the vapor barrier should be installed towards the floor of the first floor, and not down, facing the basement floor. This is directly opposite of what most lay persons would prefer, due to the tendency to feel that the vapor barrier will protect the insulation from the elements, if faced out towards the basement slab. A vapor barrier is intended to stop the moisture from migrating into the insulation. Warm air is capable of holding more moisture than cooler air, therefore the vapor barrier is installed to stop the warm airs moisture from migrating into the fiberglass insulation.

It is important that the vapor barrier is always installed facing the warm air. The installation will consist of simply stapling the sides of the vapor barrier to the studs, using only friction to hold the insulation in place, or installing a piece of wire that fits directly between the studs to hold the insulation in place.