Pure Welsh Sheep's Wool Loft Insulation – 100% Natural & Sustainable Loose-Fill (5kg Bag)

Sold by the 5kg bag. If you require 10kg purchase 2 units.

Bring the natural warmth of the Mid Wales hills into your home with Prowool Insulation. Straight from our family farm and trusted local neighbours, our 100% natural, loose fill sheep’s wool is the ultimate sustainable choice for a cozy, breathable loft space. Unlike standard, factory produced insulation, our wool is entirely air dried to preserve its natural loft, spring, and structure. We wash and treat it using a traditional borax process to the highest required safety standards meaning zero harsh chemicals, zero synthetic additives, and no irritating dust. It is completely safe, soft to the touch, and easy to handle without any specialized protective gear or clothing.

As a passionate new company, we are dedicated to total transparency. We are currently working alongside leading UK based laboratories and technical consultants to pursue full UK fire regulations and formal certifications, ensuring our small batch wool matches modern building performance standards.

Why Choose Prowool for Your Loft?

• From Farm to Frame: Proudly sourced from our own farm and local Mid Wales smallholders to support rural agricultural communities.
• 100% Air-Dried: We never force dry our wool. Safe, slow air drying prevents fiber damage, keeping the wool fluffy, resilient, and highly insulating.
• Breathable & Healthier Homes: Naturally absorbs and releases moisture, protecting your timbers from damp while acting as a natural air filter.

Indicative Coverage Guide (Based on initial R&D calculations)

• Thermal Conductivity: Assumed λ value of 0.042 W/m·K.
• Density: Assumed installed density of 11 kg/m³.
• Coverage: At a standard recommended depth of 250mm, one 5kg bag covers approximately 1.82 m² (containing roughly 0.455 m³ of loose wool).
• Roof U-Value: Estimated roof U-value of 0.16 W/m²·K when installed at 250mm (with 100mm between roof timbers and 150mm over timbers).

Special Loft Offer

Buy 10 bags or more and choose your reward at checkout! Get a 5% discount on your total order OR receive a free roll of high quality insulation netting to make securing your wall cavities effortless. Please contact us directly.

Here for You 7 Days a Week. Need assistance calculating exactly how many bags your project requires? Our friendly, UK based customer service team is available 7 days a week to answer questions, guide your installation, or take phone orders.