How do you attach steps to the exterior of a slab on grade?
Deep thanks to you for your videos on insulating thickened edge slabs, they've helped my designer and me immensely in at least starting to overcome a change to a monolithic slab, when soil bearing test proved that change was necessary. We have a couple questions left, that I'm hoping to get help with. The house will be a variation of straw-bale, with the bales inside the 2x4 framing, and either a variation of light-straw-clay or blown mineral wool infill insulation, and plastered inside and out. We could perhaps use 2x6's with the extra 2' proud of the sill, but with wanting to insulate the external aspect of the slab very well (will have radiant floor heat), and use mineral wool boards to do so (this will be a non-toxic house), that leaves somewhere in the vacinity of 8" of foundation insulation assembly proud of the wall plane. The problems my designer brought up are:
1) the difficulties in either securing flashing over the top and partially down the side of the insulation/cementboard assembly, especially at the corners, without using toxic glues (and actually, also in bending the flashing neatly); or the difficulty in trusting the longevity with parging the connection of a strip of cementboard connecting the bottom of the wall to the cementboard on the.exterior of the foundation insulation.
2) how to attach steps over the ca. 8" of insulation assembly, at the right height (perhaps especially for the one wheel chair accessible entry), without compromising the insulation greatly at the attachment point.
Let me know if I left out any needed information. Thanks very much for offering this oportunty to ask this kind of question.