Ways to Install Insulation
Insulation is not only made from a variety of materials, it comes in different forms. Cellulose comes in a loose-fill form, fiberglass is available as both loose-fill and batts, while denim comes in batt form only. Spray foam insulation is a two-part chemical that is mixed and sprayed at the time of installation.
While it’s possible for the homeowner to install some of these insulations, it is recommended that a professional installer be used to ensure proper installation and the best performance, especially on larger projects such as new homes.
- Loose-Fill (blown-in)
- Batts and Rolls
- Spray Applied Foam
- Rigid
- Reflective
Loose-Fill (Blown-in)
Using a long hose that’s connected to a blowing machine, insulation is directed into a wall cavity or attic, filing the cavity or blanketing the space. To achieve the desired R-value, install the amount specified on the coverage chart printed on the bag. (Cellulose insulation coverage charts are developed to take into account any settling of the material, so following the directions will yield the desired R-values.)
As a practical matter, a homeowner should only consider installing cellulose in their attic, either where there is none today or as a cap over existing material. The rental blowing machines available at home centers don’t have sufficient capability to properly densepack a wall cavity.
In new homes, cellulose can be applied dry, either blown-in behind a fire-rated synthetic membrane that is stapled to the studs, or damp-sprayed by an installer using a specialized spray truck. (Even though there is a small amount of water added to the material during this process, the insulation dries quickly and meets all ASTM requirements for preventing mold.)
A significant advantage of blown-in insulation over batts is that it completely fills the wall cavities, particularly around electrical outlets and other penetrations, blocking air movement through the wall.
