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thank you for the above advice. when the K-value for a certain insulation material, say k-value, thermal conductivity for rockwool is 0.044w/mk which it says on the webpage, does it mean to all kind of thickness? or different thickness will have different k values? how can i calculate between...

not sure. i was told to have many other alternatives. anyone has any idea how much thickness of different insulating materials to achieve the building regulation requirements of u-values?

I need help. I am trying to understand how loft insulation generally works. I understand that the building regulation has a requirment of reaching the U-value of 0.16w/m2k, am I right? I would like to ask how is loft insulation usually installed and how much thickness of different insulating...