Roof Insulation Foam Price: The Unvented Attic Strategy
Interactive Calculator
Estimate Your Roof Deck Spray Foam Cost
Enter your attic footprint and roof pitch to estimate closed-cell roof deck encapsulation using Louisiana's 3-inch code standard.
Thickness: 3 inches closed-cell (Louisiana code standard)
Estimated Project Cost
$9,477 – $11,583
Based on 1,950 sq ft of roof deck surface, 5,850 board feet at $1.50/bd ft, including a 20% estimate markup.
⚠️ NOTE: This calculator provides a rough, high-end estimate based on average closed-cell board-foot pricing and estimated roof pitch. This is NOT a guaranteed price. Call 985-465-8899 for an accurate, on-site quote.
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.