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See attached PDF for question about venting two toilets that drain under a slab. Toilet drains and main drain are 4", drawing shows preferred plan view schematic. Red line on drawing shows alternative layout of venting for the toilets -- would rather not use the alternative if the black...

Anyone know if building codes (UPC, BOCA, etc) typically allow foam core Sch 40 PVC under a slab? Any reason to not use it even if allowed?

Thanks for the help with this topic!

What is standard practice at the rough-in stage for PVC DWV piping that penetrates a slab floor? In particular, how are vents and drains terminated in (or above or below) the slab before the concrete work is done? Are all drains/vents brought through the slab and left projecting above the...