insulation

[Alfred Oakes]

Hello
dose any one have any experence with changing out the fiberglass insulation to spray in foame?
if you do how did you get the old out, from the inside or out side?
what tipe of foame did you use?
Did you change out the floor insulation too?
thanks i would to hear from any one

[Mark]

The r-value of spray foam is less than that of fiberglass insulation. Perhaps you are thinking of blow-in insulation? I don't think spray-foam is an option. Blow-in insulation is usually wool and would probably be OK in the walls. I grit my teeth with people who put it into the belly of the home as it makes working on pipes and such in the belly a total nightmare. Sometimes I turn down those jobs rather than having to deal with all that blown-in insulation in the belly.

Mark

[Mike Myers]

Sprayed foam insulation is typically more energy efficient than traditional batt insualtion. By acting as a wind and air barrier, it often eliminates the need for separate air-tightness detailing. This increases energy efficiency by allowing downsizing of the heating and cooling system equipment.

Low-density urethane spray foams can achieve up to R-11 per inch, though most foams are rated much lower, with values around R-4 to R-6.

The R-value of different types of fiberglass is not the same per inch. For example, you can expect R-values between 3.2 to 3.3 per inch in fiberglass batts and blankets when fully expanded. Loose fiberglass fill (poured or blown) usually exhibits an R-value of 2.1 to 2.7 per inch.

Batts are fine, but NOT better than foam.