John D so to confirm you think the earthwool product is better than rockwool? I always though rockwool was the better product as the earthwool...
R value for rockwool is better than earthwool
I've attached a photo of the insulation that's been used by my builder. Remember it's for an external cavity wall. In the spec it just says 100mm...
I am having a single storey extension built and the builder has used 100mm Knuaf Earthwool insulation in an external cavity wall instead of 100mm...
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