I'm trying to determine which is the preferred method of blocking out a stemwall foundation for garage door where a slab will be poured in the garage as shown in the images below. I've seen it done both ways and I've actually drawn details showing both these options. Option 1 does not typically block all of the stemwall out and seems to be more common in locations where the frostline is deeper (24" or deeper, ie. Utah). Option 2 completely blocks out the stemwall at the garage door and then a thicken edge is poured where the slab meets the footing at the garage door (this seems to be the preferred method in Western Washington). From a structural point of view which is the better method and also from a construction point of view what are the pros and cons?
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