This video explains why lambda values (W/Km) are only a part of the story. And why the material with the lowest lambda value doesn't mean it is the best insulation material.
This is a great video explaining U-value. Enjoy.
We were contacted by a client in East Grinstead and asked to repair the insulation done by previous builder. We found rolls of Knauf earthwool being pushed between the rafters without any support or cover, so the insulation kept slumping and falling out.We explained to the client the advantages of Steico's wood fibre natural insulation [...]