Generally when we talk about batts the first thing that most people think about is fiberglass batts. This is because they are the most common, but they aren’t the only thing out there. Along with fiberglass batts, mineral wool and cotton batts are forms of insulation. They all come in different thicknesses and sizes and have different R-values, but they have similar characteristics. They are all made out of recycled materials, and metal and cotton batts are easier to make than fiberglass batts, so they are better for the environment as a whole.
R-values for different types of batts:
| Fiberglass Batts | R-3 to R-3.8 per inch |
| Mineral wool batts | R-4 to R-4.3 per inch |
| Cotton batts | R-3.7 per inch |
Installation of Batts
Whenever dealing with batts, fiberglass or otherwise, installation is very important. If the installation of the batts is done improperly, it can cut your R-value in half. The batts have to fit perfectly together, not allowing any gaps or cracks in between them or air will escape through them. Batts can also move and slide around if not installed properly, which will again cause unwanted gaps.
Getting insulation batts wet can also diminish its R-value. Fiberglass batts particularly if they get wet they stop working and can grow mold.