As you can see from the graph to the below, the house with the spray foam insulation preformed almost 40% more efficiently than the house with Fiberglass insulation. But how can this be, considering House 1 had almost twice the R-value on the building envelope? The answer is simple. The house with the spray foam envelope was eliminating air infiltration, as well as stopping the heat transfer at the point of entry. In summary, we have learned that it is more important to have air-impermeable insulation on the building envelope than to have air-permeable products with higher R-values. Applying spray foam insulation to the underside of roof decking significantly adds to the efficiency of the home. Yes, the initial cost of spray foam insulation is greater than other methods, but with the high amount of energy savings you will achieve, it will more than pay for itself in a short amount of time. In this example it payed for it self in just three years. Just think, you can apply your energy savings directly to your monthly mortgage payment. On a thirty-year mortgage that is a lot of savings.
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SPRAY FOAM
Why Use Spray Foam
Spray foam insulation, is the most versatile insulation available today. Not only is it the only product on the market that has an aged R-value of 6.8 per inch (2 times all other products) but it also adds tremendous structural integrity and creates a total air and vapor barrier at the same time.
Unlike traditional insulating materials like fiberglass or cellulose, spray foam insulation can seal and fill all the tiny cracks and seams you might not even see. The seamless material virtually eliminates energy- wasting air infiltration. In addition polyurethane has the highest R-value for any given thickness compared to other insulation products. Because it offers a higher R-value per inch, homeowners using spray foam insulation can use 2×4 construction on exterior walls instead of 2×6 studs required with traditional insulation. This can save on framing cost as well as extended window and door jams. This simple change can increase the amount of living space by as much as 35 square feet in a 1500 square foot home – The equivalent of an extra closet. spray foam insulation also helps control moisture, condensation, it won’t shrink or settle, and it is fire and insect resistant.
Advantages Of Spray Foam Insulation
Spray foam insulation reduces energy use in buildings up to 50% because it:
- Provides a continuous air barrier
- Prevents moisture infiltration through air leakage
- Minimizes dew-point problems and condensation
- Will not sag or settle
- Doesn’t rely on still air to insulate
- Provides reliable performance under varying conditions.
Same House Case Study
It has been estimated that 40% of heating and cooling loss results from leaks in the building envelope. When deciding what type of insulation to use in your home, you must consider more than just R-value alone. Spray foam insulation offers the builder/homeowner tremendous versatility. Spray foam insulation adheres to virtually any clean dry substrate to provide thermal insulation and sound deadening. It fills in cracks and voids to control moisture flow, even as it conforms to virtually any shape or surface configuration that might be used. Fiberglass only filters air through the envelope. To prove this point a case study was conducted using two identical 1800 square foot homes in the same neighborhood. House 1 was insulated to Energy Star standards using R-13 Fiberglass batts in sidewalls, R-19 Fiberglass batts in sloped ceilings, and R-38 blown Fiberglass in the attic area. House 2 was insulated with spray foam insulation. The spray foam insulation was was applied at a 2 inch average R-14 over the entire building envelope (All side walls and the roof assembly).
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