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Wool insulation commands a higher price point than traditional fiberglass options. Mineral wool starts at $1.40 per square foot for materials, while premium sheep's wool can reach $4 per square foot. The higher cost reflects wool's superior performance characteristics, including better fire resistance, moisture management properties, and environmental benefits. Many homeowners find this premium worthwhile for the improved insulating performance and natural composition.

The value proposition of wool insulation extends beyond basic thermal performance. Natural wool products resist fire without the need for chemical treatments, manage moisture effectively, and offer excellent durability. Unlike many synthetic alternatives, wool insulation materials are renewable resources with minimal environmental impact. For homeowners concerned with indoor air quality, energy efficiency, and sustainable building practices, the additional investment often justifies itself through performance and peace of mind.

Mineral wool installations can last up to 50 years when properly installed and maintained in dry conditions. Sheep's wool has a longevity comparable to fiberglass options, while hemp wool's lifespan estimates vary widely, ranging from 20 to 100 years, depending on the quality of installation and environmental conditions. With proper moisture control and ventilation, wool insulation maintains its insulating properties for far longer than many alternative materials, making it a durable and long-term investment.