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Is 100mm loft roll ok to use as insulation in a 100mm masonry cavity wall? It’s a small extension on back of garage 5mx3m single storey. My builder says it’s fine to use and no need for the more expensive slab insulation which you are supposed to use as you build up walls. Any advice would be...

I am having a small extension 5x3m built at back of garage. My builder is using earth wool loft insulation to fill the 100mm cavity between brick and block. I don’t think this is a good idea and should be a different type Such as rigid slab dritherm variety. He thinks loft insulation is...