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U value would be 0.31. However, I just had a reply back from my local building control: 100mm block gives you 100mm thickness.You need 190 structural thickness. Either solid double block wall or single block with piers. The 190 referred to in part A is to do with the structural wall...

Thankyou for the prompt reply. I took a look at the approved document and found the following information: If the height of the wall does not exceed 3.5m and the length of the build does not exceed 12, then the minimum thickness of the wall has to no less than 190mm for the whole of its...

Hi all A newbie on here, so please go easy. I am having a 5m by 8m outbuilding built at the rear of my garden and would like to gain maximum internal floor space area. This will not be a living accommodation, just a room for household and garden storage. I am looking for a minimum thickness...