Why Use Foam Insulation?

Insulation is used to reduce thermal transfer through the exterior walls of the home. Though fiberglass blankets are one of the most common insulating materials, newer foam insulation made from polyurethane or polystyrene are quickly gaining popularity with homeowners. Though foam insulation may be more costly than other materials, it offers a number of benefits that may outweigh its higher cost.

R-Value

Foam insulation offers approximately twice the insulating properties as fiberglass or loose fill products. Foam has an R-value, or thermal resistance, between 4 and 6.5 per inch, while fiberglass and cellulose range from R-2 to R-3 per inch. This means that foam insulation is more effective at preventing air leaks and maintaining a comfortable living space. It may also help to reduce energy consumption, which can lower utility bills and help protect the environment.

Versatility

One of the primary benefits of foam insulation is its versatility. Rigid foam sheets can be used in walls, floors and ceiling structures. It can be installed on top of roof sheathing to help insulate the roof or along foundation walls to keep cold air from entering the basement. This product is also useful in smaller spaces where batt insulation is impractical. Foam boards can be cut to fit around obstructions in the wall, and foam boards can insulate thin walls where thicker batts may not fit.

Strength and Lifespan

Foam insulation will naturally fill an entire wall cavity when properly installed; fiberglass blankets tend to leave gaps where air can leak through. While fiberglass can sag or collapse over time, foam remains rigid for many years to keep insulation effectiveness high. Foam is also resistant to mold and mildew and will not suffer damage when exposed to moisture or condensation.

Spray Foam

Spray foam is one of the only insulation products available that can easily be added to existing homes. Polyurethane or cementitious foam is liquefied and then sprayed into small holes drilled in the wall. The foam slowly expands to fill the entire space, and the walls are patched and painted to cover the holes. Spray foam offers similar insulating properties as rigid foam panels and can greatly reduce thermal transfer in existing structures.

Structural Sheathing

Rigid foam insulation provides enough structural support to make it an effective alternative to plywood sheathing. Rather than install wall sheathing and then add insulation, a single layer of rigid foam can take the place of both of these materials. This can reduce installation time as well as overall costs. Foam insulation is often less expensive than plywood sheathing and is easier to cut and install.

References

• Types of Foam Insulation
• Energy Savers: Insulation
• Spray Foam