Custom home design-build contractor, planning stages to build my first slab-on-grade home (common out here in AZ where I've moved). IPC, and I'm not familiar with IPC yet. Is it ok to put a 2" ABS vertical vent through a 12" wide by 12" deep concrete footing, rather than just the concrete slab? (Seems like it must be, or all plumbing would have to be on interior non-bearing walls in slab-on-grade regions.)
Also, I've always specified ABS for DWV, but I know some people use PVC for vents- any benefits to PVC over ABS in contact with concrete? And regardless of which I use, would you sleeve it in some 3"? Likely cant ever get under slab foundation to replace drain fixtures anyway, so not sure sleeving will do any good, unless it's important to keep the vent pipes un-fixed to concrete for curing or shifting reasons. But I don't think anyone is doing that with drains out here, so I'm guessing it's unnecessary.
Finally, does anyone see a problem with putting through-slab sink drains a couple inches in FRONT of the wall framing? Again with this being my first slab-on-grade build, I'm worried if the plumber doesn't correctly get the drain placement centered in the future wall location before we pour the concrete foundation, that would seem to mean having to permanently move the wall framing and change room size after the concrete is poured if we discover the drain placement isn't entirely accurate when we're laying out wall plates. So I'm thinking if all sinks are in cabinets anyway, why not specify the sink drains a few inches in front of the wall framing...the drain through floor would be hidden by cabinets, it should make framing faster/easier, and we're not as likely to have to move a wall if the plumber's placement is a little bit off. If the plumber has it right, fine, if it's a few inches in front of that or side-to-side it's fine because still hidden by cabinet (won't even cause stud locations to have to shift inside wall if a little off side-to-side), and if its a few inches back, well that's fine too because now it's in the wall where it's normally expected
There's just some plumbing along interior load-bearing walls in this design, and I definitely don't want to have to move those walls, and discover that causes structural/engineering issues.
But I've never put sink drains through floor in front of walls before, so don't know if I'm not thinking of something that could be an issue. Cabinet install will be a little more difficult because will have to notch out a small section of cabinet floor (and potentially some cabinet back), so that if homeowner wants to replace the cabinets in the future they can slide them out around the through-floor drain, but that shouldn't be too hard to modify the cabinets to do. Anything other issues ya'll can think of?
Also, I've always specified ABS for DWV, but I know some people use PVC for vents- any benefits to PVC over ABS in contact with concrete? And regardless of which I use, would you sleeve it in some 3"? Likely cant ever get under slab foundation to replace drain fixtures anyway, so not sure sleeving will do any good, unless it's important to keep the vent pipes un-fixed to concrete for curing or shifting reasons. But I don't think anyone is doing that with drains out here, so I'm guessing it's unnecessary.
Finally, does anyone see a problem with putting through-slab sink drains a couple inches in FRONT of the wall framing? Again with this being my first slab-on-grade build, I'm worried if the plumber doesn't correctly get the drain placement centered in the future wall location before we pour the concrete foundation, that would seem to mean having to permanently move the wall framing and change room size after the concrete is poured if we discover the drain placement isn't entirely accurate when we're laying out wall plates. So I'm thinking if all sinks are in cabinets anyway, why not specify the sink drains a few inches in front of the wall framing...the drain through floor would be hidden by cabinets, it should make framing faster/easier, and we're not as likely to have to move a wall if the plumber's placement is a little bit off. If the plumber has it right, fine, if it's a few inches in front of that or side-to-side it's fine because still hidden by cabinet (won't even cause stud locations to have to shift inside wall if a little off side-to-side), and if its a few inches back, well that's fine too because now it's in the wall where it's normally expected
There's just some plumbing along interior load-bearing walls in this design, and I definitely don't want to have to move those walls, and discover that causes structural/engineering issues.But I've never put sink drains through floor in front of walls before, so don't know if I'm not thinking of something that could be an issue. Cabinet install will be a little more difficult because will have to notch out a small section of cabinet floor (and potentially some cabinet back), so that if homeowner wants to replace the cabinets in the future they can slide them out around the through-floor drain, but that shouldn't be too hard to modify the cabinets to do. Anything other issues ya'll can think of?
