InstaBidsWhat is mineral wool insulation?
Mineral wool insulation is made from rock or slag melted and spun into fibers. It resists heat flow and comes in forms such as batts, rolls and loose fill.
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Are fiberglass and mineral wool fire resistant?
Yes. NAIMA describes both materials as naturally non-combustible. For mineral wool, this is a material property; it does not establish a fire-resistance rating for a complete wall or ceiling assembly. “Both fiberglass and mineral wool are naturally non-combustible.” Source: North American Insulation Manufacturers Association, read 2026-10-31.
What is mineral wool insulation made from, and what forms does it take?
Mineral wool insulation uses fibers produced from melted rock or blast-furnace slag. NAIMA identifies batts, rolls and loose fill as product forms; these names describe the form supplied for the building cavity. “Mineral wool comes in batts, rolls or loose-fill forms.” Source: North American Insulation Manufacturers Association, read 2026-10-31.
What is R-Value?
R-value expresses resistance to heat flow. For mineral wool rigid board specifically, the Building America table lists a typical R-3 to R-4 per inch. That range describes the material per inch, rather than the performance of a complete insulated wall. ““R” stands for resistance to heat flow.” Source: North American Insulation Manufacturers Association, read 2026-10-31. “Typical R-values for common insulation materials are summarized in this table, which also identifies the vapor retarder classification for each insulation.” Source: Building America Solution Center, Pacific Northwest National Laboratory, read 2026-10-31.
Does Mineral Wool Insulation Need a Vapor Barrier?
The need depends on the wall assembly and its moisture design. The federal basement guide lists mineral wool as not itself a vapor retarder, with performance depending on its facing. In its basement-specific guidance, the report also explains why allowing drying matters; the material name alone does not settle the vapor-control choice. “Basement wall systems are dryer (overall) when there is some vapor permeability in an interior insulation system.” Source: U.S. Department of Energy, Building America, read 2026-10-31.
If fiberglass or mineral wool becomes wet, can you still use it?
For mineral wool, NYSERDA describes drying as possible under proper conditions because the mineral fibers do not absorb moisture. This supports a conditional answer, not automatic reuse: the guide does not say every wetted insulation assembly can remain in place. “Because mineral fibers do not absorb water or moisture, under proper conditions, material that has been wetted will dry readily.” Source: New York State Energy Research and Development Authority, read 2026-10-31.
Sources
- Answers to FAQs — North American Insulation Manufacturers Association; read 2026-10-31.
- Comparing Insulation Types — North American Insulation Manufacturers Association; read 2026-10-31.
- Typical R-values and Vapor Retarder Classifications for Common Insulation Materials — Building America Solution Center, Pacific Northwest National Laboratory; read 2026-10-31.
- Measure Guideline: Basement Insulation Basics — U.S. Department of Energy, Building America; published October 2012; read 2026-10-31.
- Build Better: A Guide to Energy Efficient Concepts for New Residential Construction, printed page 32 — New York State Energy Research and Development Authority; read 2026-10-31.
- Answers to FAQs: R-Value — North American Insulation Manufacturers Association; read 2026-10-31.