There are many differences, from active components to application to cost savings. While spray foam is more expensive than fiberglass and blown-in cellulose, it is the only insulation that offers an immediate reduction to energy costs due to its air barrier characteristics. Spray foam does not sag, compress, or settle over time and allows a greater protection against drafts and air loss in tight and hard to reach places.
No matter what form, fiberglass is not an air barrier and will not stop air leakage, especially at the tip and in tight places. Beyond that, the ‘R’ value or measure of insulation performance in the product is twice that of traditional fiberglass insulation products.
Specifically, spray foam offers:
- Higher ‘R’ value
- Liquid application to fill more gaps and create a tighter bond
- No chemical or physical changes over time
- Moisture barrier
- Adds structural strength to walls and roofs
- Can minimize sound transmission at greater levels