## What is the R factor of great stuff spray foam?

Two-part closed cell spray foams have R values ranging from R-5 to R-6.1 per inch. Single-part Great Stuff™ sealants are used to fill smaller areas where air and moisture can flow.

**What is the R-value per inch of spray foam?**

Open-cell spray foam has an R-value of about R-3.7 per inch, while closed-cell spray foam has an R-value that may be as high as R-6.5 per inch.

### Can you use canned spray foam as insulation?

Yes, expanding foam can be used as insulation. Expanding foam can be defined as a two-component mixture composed of two materials that react when mixed. This causes the foam to expand and harden, providing an insulating material.

**What is the R-value of 2 inches of closed cell spray foam?**

This microscopic difference in the two products creates a dramatic difference in performance. Closed cell spray foam has an R-value of R-7 per inch. In comparison, open cell spray foam has an R-value of R-3.8 per inch. Additionally, the materials have decidedly different densities.

## What is the R-value of spray foam in a 2×4 wall?

Open-cell spray foam absorbs and holds water. It has a lower R-value per inch than closed-cell foam and is vapor-permeable. The R-value is R-3.5 to R-3.6 per inch, so filling a 2×4 cavity yields about an R-13.

**What is the R-value of 2 inch closed cell spray foam?**

### What is the R-value of 1 inch of air space?

Insulation R-Value

Material | R value(ft^2 °F h/Btu |
---|---|

Cellulose fiber(1 in. thick) | 3.70 |

Flat glass (0.125 in thick) | 0.89 |

Insulating glass(0.25 in space) | 1.54 |

Air space (3.5 in. thick) | 1.01 |

**What is the R-value of 1/2 inch Styrofoam?**

STYROFOAM extruded polystyrene insulation is rated at an R-value of 5.0 per inch at 75°F.