Spray Foam Board Feet Calculator
Here’s a comprehensive table with everything you need to know about Board Feet for Spray Foam Insulation. It includes formulas, common coverage estimates, and R-values.
Board Feet Calculation & Spray Foam Coverage Guide
| Category | Details |
|---|---|
| Board Foot Definition | A unit of volume measurement for spray foam (1 board foot = 12″ × 12″ × 1″ thick) |
| Formula | Board Feet=Length (ft)×Width (ft)×Thickness (inches)12\text{Board Feet} = \frac{\text{Length (ft)} \times \text{Width (ft)} \times \text{Thickness (inches)}}{12}Board Feet=12Length (ft)×Width (ft)×Thickness (inches) |
| Common Spray Foam Types | Open-Cell (Soft, Expands More) & Closed-Cell (Rigid, Higher R-Value) |
| R-Value per Inch | Open-Cell: R-3.5 to R-4.0 Closed-Cell: R-6.0 to R-7.0 |
| Common Coverage per 55-Gallon Drum | Open-Cell: ~16,000 board feet Closed-Cell: ~4,000 board feet |
| Typical Spray Foam Thickness | Walls: 2″ – 3″ Attic: 5″ – 6″ Roof: 6″ – 7″ |
| Example Calculation | 10ft × 10ft × 2 inches thick → 10×10×212=16.67\frac{10 \times 10 \times 2}{12} = 16.671210×10×2=16.67 board feet |
| Cost Estimation | Open-Cell: ~$0.40 – $0.65 per board foot Closed-Cell: ~$1.00 – $2.00 per board foot |
| Application Areas | Attics, Basements, Crawlspaces, Walls, Roofs, Pole Barns |
| Pros of Spray Foam | High R-Value, Air Sealing, Mold & Moisture Resistant |
| Cons of Spray Foam | Expensive, Requires Professional Installation, Not Easily Removable |