Insulate Smarter with Natural Wool

Frequently Asked Questions

• Is natural wool insulation better than fiberglass insulation?

  It depends on the priorities of your project. Natural wool provides reliable thermal performance while also managing moisture, absorbing sound, and avoiding the irritating glass fibers and chemical binders associated with many conventional products. Fiberglass may have a lower upfront cost, while wool can offer added value through easier handling, long-term loft, healthier material composition, and whole-building comfort.

• What R-value does wool insulation have?

  Havelock Wool insulation provides approximately R-4.3 per inch. Current PRO Batt products are offered in R-14 and R-22 configurations, while loose-fill wool can be installed to the depth needed to reach a range of project-specific R-values. Always select the product and installed depth required by your local energy code and assembly design.

• Does wool insulation absorb moisture?

  Yes. Wool can absorb and release moisture vapor as indoor conditions change while remaining dry to the touch and maintaining its insulating loft. This natural moisture buffering helps assemblies manage humidity, but the insulation should still be protected from bulk water, leaks, and prolonged saturation.

• Can wool insulation get moldy?

  Wool does not readily support mold growth, and its ability to absorb and release moisture helps reduce the conditions mold needs to thrive. However, no building material should be left in a persistently wet or contaminated assembly. Leaks, bulk water, and air-sealing problems should always be corrected promptly.

• Is wool insulation fire resistant?

  Wool is naturally resistant to ignition and tends to char and self-extinguish rather than readily support flame spread. It is fire resistant, not fireproof, and it must still be installed as part of a code-compliant wall, floor, ceiling, or roof assembly.

• Does non-toxic wool insulation off-gas?

  Havelock Wool insulation does not rely on the synthetic binders, added formaldehyde, or spray-applied chemicals commonly associated with strong odors and off-gassing. Its natural fiber composition makes it a strong choice for projects focused on healthier indoor air and material transparency.

• How long does natural wool insulation last?

  When it is properly installed and protected from bulk water, wool insulation can perform for decades. Its resilient fibers naturally regain and maintain loft, helping the material preserve both thermal and acoustic performance over time.

• Is wool insulation good for soundproofing?

  Wool is an effective sound-absorbing insulation because its dense, fibrous structure helps reduce sound transmission through walls, floors, and ceilings. It can make a space noticeably quieter, although complete soundproofing also depends on the full assembly, including framing, air sealing, mass, isolation, and penetrations.

• How do I install wool batt insulation?

  Allow the batts to regain their natural loft, then friction-fit them snugly into each framing cavity. Cut or separate the wool as needed around wiring, plumbing, outlets, and other obstructions so the cavity is completely filled without gaps or excessive compression. Follow Havelock's installation guidance and all local building-code requirements for your assembly.

• Is natural wool insulation safe for people with allergies?

  Havelock Wool is made from cleaned wool fiber and does not contain the itchy glass fibers found in fiberglass insulation. Once installed, it is enclosed within the building assembly. People with a known sensitivity to wool should still use appropriate handling precautions and consult a qualified health professional if they have specific concerns.

• Is wool insulation worth the cost compared to fiberglass?

  For many projects, yes. Wool may cost more upfront, but the comparison should also include installation comfort, moisture management, acoustic performance, material health, durability, and long-term thermal performance. The best value depends on the project's budget, climate, assembly design, and indoor-environment goals.

• Does wool insulation need a vapor barrier?

  Not in most wall or roof assemblies. Havelock generally recommends an impermeable vapor barrier only over exposed soil in a crawl space, while vapor-open or vapor-variable air-control layers may be appropriate elsewhere. The correct approach depends on climate, assembly design, and local code, so confirm the final detail with a building professional familiar with the project.

• Is wool insulation safe for families?

  Yes. Wool is naturally non-toxic and contains no added formaldehyde or harmful chemicals, making it safe for children, pets, and anyone sensitive to indoor air quality.

• Does wool insulation improve indoor air quality?

  Wool actively absorbs and binds indoor air pollutants, including volatile organic compounds, helping to maintain a cleaner, healthier home environment.

• How does wool compare to fiberglass or spray foam?

  Wool offers superior moisture control, does not off-gas, and is easier and safer to install. It also maintains performance over time without degrading.

• Will wool insulation lower energy bills?

  Wool’s thermal performance reduces heat loss in winter and heat gain in summer, which can ease the load on heating and cooling systems.

• Is wool a good option for remodeling projects?

  Absolutely. Whether you’re updating a single room or an entire home, wool insulation offers an immediate improvement in comfort and indoor air quality.