Thermacork is harder to find than options like cellulose and wool, but we did track down one supplier that services the western U.S. and stocks Thermacork Insulation. Sheep Wool Insulation Is Made ...

Loft insulation is one of the most cost-effective ways to combat this. For a semi-detached home, installing 270mm of mineral wool or sheep wool insulation costs around £900 but could save you up ...