R-Value

Insulation is rated in terms of thermal resistance (R-Value) which indicates the resistance to heat flow. When Sprayed Polyurethane Foam (SPF) is used you can protect against both convection (heat transfer by way of contact with a material) and radiation (transfer of heat by waves – not requiring contact). SPF has the highest R-Value (~7.14 per 1 inch thickness) of all readily available insulations on the market today - allowing existing structures with smaller framing sizes to be retrofitted to meet current national insulation R-Value code requirements.

Avant Barn Conversion Project - Milanville, PA
SPF applied to existing narrow frame to meet R-Value code requirements and to provide structural integrity.

When using traditional fiberglass batts, R-Values can differ widely, especially if batts are improperly installed. For example, an R-13 rated batt may only provide R-9 insulation. Whole wall R-Values may be even less because of multiple voids in the air barrier.

Habitat for Humanity Home - Cresco, PA
Open cell spray foam insulation being applied to sidewalls.

R-Value is only a contributor of what creates a truly well insulated home. As SPF is applied and expands, it forms a seamless air and moisture barrier that prevents air and water infiltration - eliminating seams and cold joints - the main cause of energy/heat loss. The U.S. Department of Energy's recommended strategy in both new and old homes is to reduce air leakage as much as possible and to provide controlled ventilation as needed.