Roof Insulation Foam Price: The Unvented Attic Strategy

The single most effective way to lower your energy bill in Louisiana is to create an "unvented attic." Instead of putting insulation on the attic floor and letting the attic bake at 130 degrees, we spray foam directly onto the underside of the roof deck. This brings your entire attic into the conditioned space of your home.

Pricing for Roof Deck Spray Foam

Because the roof deck is the primary barrier against the sun and humidity, we strictly recommend closed-cell spray foam.

• Cost Per Board Foot: $1.50 to $2.50.
• Depth Required: Building codes typically require 2 to 3 inches of closed-cell foam on the underside of a roof deck to achieve the necessary R-value and vapor barrier.

By dropping your attic temperature by 40 degrees, your HVAC system works half as hard. Most homeowners see a 30% to 50% reduction in their monthly AC bills, meaning the roof deck insulation pays for itself over time.