100mm or 50mm cavity

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May 13, 2018
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I am planning to replace my existing conservatory with an extension same dimensions height etc. The existing conservatory has a dwarf wall 10 bricks high which I am keeping, with a 50mm cavity. New regs require a 100mm cavity will i be able to keep the 50mm cavity or will I have to remove and rebuild the inner wall to create a 100mm cavity. Thanks
 

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