# How many inches of blown fiberglass insulation is r38?

R-Value | Minimum Thickness | Bags per 1000 Sq Ft |
---|---|---|

R49 | 15” | 75.2 |

R44 | 13.4” | 66.2 |

R38 | 11.6” | 55.5 |

R30 | 9.3” | 42.7 |

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In this regard, how many inches of insulation is r38?

An **R-38** fiberglass batt should be approximately 12 **inches** thick, while the thickness of cellulose **insulation** of a finished, fitted product will larger.

Likewise, what is the R value of 12 inches of blown insulation?

R-value of Materials and Depths | ||
---|---|---|

Material | R-value/in | 12" |

Fiberglass blown (attic) | 2.2 - 4.3 | 26.4 - 51.6 |

Fiberglass blown (wall) | 3.7 - 4.3 | 44.4 - 51.6 |

Mineral Wool (batt) | 3.1 - 3.4 | 37.2 - 40.8 |

Likewise, how many inches of blown insulation is r40?

**Blown** and batt **insulation** have different r-values based on depth. R-25 is approx. 7 **inches of blown insulation** R-40 is 12 **inches of blown insulation**.

How many inches of blown fiberglass insulation is r60?

In temperate coastal areas such as Zone 3, attic insulation of at least R30 up to a maximum of R60 is recommended. For loose-fill cellulose, this translates to a total depth ranging from **8 inches** up to **16 inches**.