I am in process of doing a garden room that will be built in mind of becoming an annex in years to come.
I'm unable to lay 3 elevations from outside my property and wondering if I can do the external block work first from within the build (off the slab)
I've ordered 50mm Kingspan insulation but because of needing to build this way would I be best swapping for some form of full fill cavity rock wool type insulation (100mm cavity)
Any help would be massively appreciated. How have I never used a forum before.. The info on here is amazing