Spray foam DIYCost Estimate Factors

In order to derive a cost estimate, the following factors need to be considered:
a) Dimensions of the area in square foot.
b) Thickness of foam required
c) Number of kits to be applied
d) Location of the building
e) Estimate allowance


S No. Fiberglass Insulation Spray Foam Insulation
1. It slows down the heat transfer process. It acts as an air barrier.
2. It costs around $0.40 per square foot. It is a little expensive and falls between the price ranges of $0.90 – $1.50 per Board Foot for closed cell foam.
3. Installation takes place by putting sheets on the wall The foam is sprayed in the gaps by a certified professional.
4. It is flammable in nature due to the presence of kraft paper It comes along with a fire retardant.
5. R-value amounts to 2.2 per inch. It loses the R-value over a period of time. R-value of open-cell foam is 3.5 per inch and that of closed cell is 6 to 7 per inch. There is no deterioration of R-value in spray foam.
6. Low insulation cost, but higher maintenance costs Higher installation cost, but low maintenance cost
7. It is not a very good sound barrier It is a good sound barrier.
8. It does not add to the structural strength It adds 250% racking strength to the structure.
9. This kind of insulation exists for a period of 10 to 25 years provided the fiberglass remains dry. Spray foam insulation enjoys a lifetime of 80 Years and above.
10 In extreme weather conditions, the heat loss takes place at a quicker rate. There is no difference in the performance of spray foam insulation in extreme weather conditions.
11 Air leakage is possible. No air leakage takes place in closed cell spray foam insulation. Minimal air leakage occurs in open-cell spray foam insulation

Spray foam insulation cost estimate Spray foam is regarded as an excellent alternative to fiberglass because it has humidity, strength, high Rvalue, shape and sealing property. Spray foam insulation protects your home from extreme weather conditions, dust; mold etc. The cost estimate of spray foam insulation is based on the amount of the volume or thickness of the insulation to be used. The thickness is referred by the term ‘Board Foot’. A board foot is 12 inches wide, 12 inches long and 1 inch thick. Cost estimation also considers the factors of foam type, foam thickness and R-value. The difference in the type of foam determines the density which in turn affects the R – value. E.g. It is assumed that a product with lighter density will come under the price range $0.44 -$0.65 per board foot. Closed cell spray foam insulation will  approximately fall in the price range $0.70 – $1 per board foot. Open- cell spray foam insulation is the cheapest method because the bubbles formed are tiny and they do not form an air-tight seal. With the expansion of the foam, the bubbles break into small pockets of air which makes the process of heat transfer slower.