Natural Timber Frame Sheep's Wool Insulation – 5kg Loose Fill Breathable Welsh Mountain Wool. Protect your build the way nature intended.

Crafted in Mid Wales, Prowool Insulation provides high performance, loose fill sheep's wool insulation tailored for timber frame structures, extensions, and heritage restorations. Sourced directly from our family farm and local agricultural partners, it offers a sustainable, low carbon alternative to synthetic fiberglass or plastic slabs. Old and new timber frames thrive on breathability. Our wool naturally absorbs and regulates moisture, preventing harmful condensation buildup and protecting structural wood from decay. Every batch is gently washed, treated with a protective borax solution to standard requirements, and entirely air dried to keep the natural fibers perfectly strong and undamaged by harsh industrial heat. We are a growing independent business committed to doing things right. We are currently collaborating with specialist consultants and UK-based testing laboratories to finalize official fire safety regulations and certifications, bringing traditional insulation into the modern era.

Why Prowool is Perfect for Timber Frames

• Genuinely Sustainable: Local Mid Wales sourcing means minimal transport miles and absolute traceability back to the farm.
• Zero Harsh Chemicals: Safe to pack tightly by hand into wall cavities and irregular timber gaps without masks, gloves, or itchy skin.
• Fiber Integrity: Air dried processing ensures the wool retains its natural bounce and won't pack down flat or sag inside wall cavities over time.

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

• Thermal Performance: Assumed thermal conductivity of 0.042 W/m·K.
• Weight & Density: Generous 5kg bag packed at an assumed installed density of 11 kg/m³.
• Volume: One bag provides approx. 0.455 m³ of loose wool, covering 1.82 m² at an indicative 250mm thickness depth.

Special Timber Frame 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