Every calculator is reviewed by certified professionals to ensure accuracy.David Chen's Master Mason, Licensed GC certification ensures professional-grade precision.

Pro Tips

Wear proper PPE including respirator, goggles, and full protective suit
Temperature should be 60-80°F for optimal application
Closed cell foam provides better moisture barrier and structural support
Allow proper cure time (24-72 hours) before covering or finishing

Common Questions

Open cell vs closed cell?

Closed cell has higher R-value and moisture resistance; open cell is cheaper and better for soundproofing

Can I DIY spray foam?

Yes, with proper PPE and kits, but pros achieve better results for large areas

What R-value do I need?

Walls: R-13 to R-21, Attics: R-38 to R-60 depending on climate

How the Calculator Works

Our spray foam calculator determines the thickness needed to achieve your target R-value based on the foam type selected. It then calculates the total board feet required (1 board foot = 1 sq ft at 1 inch thick) and estimates the number of DIY kits needed for your project.

Formula

Thickness = Target R-Value ÷ R-Value per inch

Board Feet = Area × Thickness × (1 + Waste%)

Quick Reference

Open cell R-value: R-3.7/inch
Closed cell R-value: R-6.5/inch
DIY kit coverage: ~400 board ft
Recommended waste: 10-15%

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