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Rich_G-
Pretty sure that will be rolled insulation. Google 150mm rockwool roll loft insulation and you'll see a bunch of product the standard I normally see specified is the Knauf stuff here which to be honest is pretty cheap. I'd get yourself the basic area where its going to be laid then just work out how many rolls you need and go off their price. Definitely worth getting 3 estimates from 3 different companies just to get a price in mind.
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Thought current Building Regs was minimum 270mm?
On1
mespilus
What type of roof insulation are they quoting for? Rolled insulation above ceiling joists at first floor or insulation in the rafters as the latter is quite expensive