Wool Insulation: Definition and What it is
Natural insulation made from sheep's wool, offering good thermal and moisture-wicking properties.
What is Wool Insulation?
Wool insulation uses natural sheep's wool fibers to provide thermal insulation with unique moisture-management properties. Wool can absorb up to 30% of its weight in moisture while maintaining insulating performance, making it ideal for applications where moisture fluctuation occurs.
Sheep's wool has been used for thermal regulation for millennia. As building insulation, wool fibers are treated with boron compounds for fire and pest resistance, then formed into batts or loose-fill. Unlike synthetic insulation that stops working when wet, wool actively manages moisture through absorption and release, helping regulate indoor humidity. The material is renewable, biodegradable, and requires minimal energy to manufacture. Wool naturally neutralizes formaldehyde and other VOCs, improving indoor air quality.
Wool Insulation Products
- Batt Insulation: Pre-sized batts similar to fiberglass, friction-fit between studs
- Loose-Fill: Blown wool for attics and irregular spaces
- Hybrid Products: Wool blended with recycled polyester for enhanced performance and cost reduction
- Raw Wool: Unprocessed or minimally processed for specialty applications
When to Choose Wool Insulation
Wool insulation excels in eco-conscious building projects and applications with moisture variability. Use wool in walls and ceilings where natural materials and VOC absorption are priorities. It's ideal for historic renovations where breathable, natural materials maintain building character. Wool costs significantly more than fiberglass ($2-$3 per sq ft) but offers superior moisture management and indoor air quality benefits. Consider wool for bedrooms, nurseries, and living areas where air quality matters most. Ensure suppliers source from sustainable, ethical wool production.
Benefits of Wool Insulation
- Natural, renewable, and biodegradable
- Absorbs and releases moisture without losing R-value
- Naturally fire-resistant (will char, not flame)
- Neutralizes VOCs and improves indoor air quality
- Excellent soundproofing properties
- Safe to handle without protective gear
Wool Insulation Cost
Wool insulation costs 2-3 times more than fiberglass but appeals to eco-conscious builders and homeowners.
- Material cost ($2.00-$3.00/sq ft for batts)
- R-value (typically R-3.5 to R-4.0 per inch)
- Availability (limited distribution in North America)
- Shipping costs for specialty product
- DIY-friendly installation similar to batts
- Premium for certified sustainable sources
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