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I have a 16×24 addition to be on an older house with 2’thick limestone foundation.My idea is to build new addition on concrete piers so I do not have to chip and chisel through the thick walls of existing house.Live in north Iowa, so insulation,ventilation,and rodents are a concern.Wondering if anyone can offer some pro’s & con’s to this type of foundation.There will be no plumbing to this addition,only HVAC.
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Prescriptive codes don't address the connection at less common angles, so base the connection off more typical ones using bolts, structural screws, blocking, and steel tension ties.
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I did same thing and am very happy. I simply skinned the bottom of the joists with foam and insulated. Storing stuff under it has broken the foam so will probably skin with solid sheathing this summer. I also inset the piers so the main beams are about 30" in from joist ends - and independently hang the skirt the perimeter.
I needed three piers - dug and mixed and poured in one weekend - all by hand with about $100 in materials - hard to beat. I would certainly look into that "bigfoot" system I see advertised in FHB next time.