Slab edge question
I’m hoping to find more information regarding the differences between a sloped thickened slab edge versus a uniform slab when doing frost-protected stem walls. I’ve included the two details for reference.
I’ve found innumerable references to details for the uniform decoupled slab (no slope/thickened) with recommended vertical and horizontal rigid foam, both on Fine Homebuilding, Green Building Advisor, and many others; however, finding the thickened sloped detail or any “concrete” information (no pun intended) is scarce.
At a glance, the sloped thickened edge detail seems to be a nightmare from a backfill/subgrade/rigid installation standpoint. Are its benefits (which I am hard-pressed to find any online resources attesting to such) worth the seemingly excessive additional backfill/subgrade/rigid install process? A few forum discussions mention alleviating slab curling as one such benefit but don’t go into detail if this is for code, best practice, or more of a commercial application for heavy traffic (as opposed to interior residential space).
Any information would be much appreciated on this subject.
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