New project, slab on grade 40x40 building

[brad bergemann]

here's a beginning sketch for input. any advice would be appreciated. first time doing rough in design. will be digging the trenches by hand, so was hoping to save on some labor time.

 

[hj]

You are not going to find many inspectors who will allow ALL, or ANY, of those horizontal vents. Back to the drawing board.

 

[Sponsor]

 

[brad bergemann]

You are not going to find many inspectors who will allow ALL, or ANY, of those horizontal vents. Back to the drawing board.

HJ,

thanks for the help. the vents are going to be coming off of the drain line at a minimum of 45 deg up angle, be pitched higher than the drain line, and turn vertical into the interior wall. i plan to tie them all together at least 12" above the highest water level in the lav. i'm finding this harder to draw than to build at this point. please continue to help. i'll try to draw an ISO of the plan this weekend for clarification.

 

[brad bergemann]

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[brad bergemann]

View attachment 38870
here's a sketch without the horizontal vents. does this look a little more workable?

 

[brad bergemann]

i've attached a new sketch and a photo of the fittings i plan to use on this slab rough in. i have the fittings in order to match the sketch. i did add a 2 p trap for the water heater overflow which is adjacent to the island sink. it's not on the sketch yet. i'll add that later today.

please advise if this looks good to go.

thank you

ps. the orientation of the fittings in the picture are not necessarily correct. i just laid them out on the floor for a reference. i'll rotate as needed during construction.

 

[brad bergemann]

and the project has grown just a little bit more.

 

[brad bergemann]

please take a look.

thank you

 

[clix]

please take a look.

thank you

Hard to tell (for an amateur, at least) what you have planned with the drawings and fittings. You mentioned putting together an isometric drawing, do you have that? Probably easier to get help if you provide a clearer picture regarding what you're doing.

 

[krik]

Not going to work. Shower #1 isn't wet vented properly, because the WC is upstream of it. Shower #3 has the same issue. The island and "WH" traps are unvented. And if WH = water heater then you'd have a dry trap over time. You should be able to do most of it with proper wet venting (except for the island), so I'd read up on how to do that. Essentially you want to tie in drains in the following order: lav, wet vent for shower arm, continued wet vent for WC. Repeat that three times. Oh, and don't forget about proper cleanouts.