Back to back bathrooms
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Tuttles Revenge
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It appears from my reading that KY allows 2 bathroom groups in horizontal wet venting which is typically the simplest installation method and easily accommodates back to back toilets.
Here is the example given in the 2018 IPC for KY
Here is the example given in the 2018 IPC for KY
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Tuttles Revenge
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One odd thing to note in their drawing is the use of a double Combination WYE on its back. Generally not allowed because its technically installed flat from side to side, but some jurisdictions recognize that if a street 45 is installed to make up for that pitch the loss of grade in that 2 inches of fitting is negligible.
Jeff H Young
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assuming it wasent in a joist bay . Id prefer a wye to pick up one w/c and a combi for the other
Tuttles Revenge
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Yeah, more specific information is needed to get a better idea of the layout and structure. I always look to how to plumb with horizontal wet venting ever since it was introduced in our area in '06. Still find it odd that the IPC allows double wye/combi on the horizontal.. unless that drawing they provided was a fluke. The canadian code allows it too.
Jeff H Young
In the Trades
Ive never really practiced horrizontal wet venting to any real extent.
the double wyes should be ok with ample fall to provide 1/4 per ft fall meaning the main require extra fall so that the branches would have fall. but if its a manufactured dbl combi I get that its probebly not legal. I supose technicaly it would need to be verticle or on a 45 which can count as verticle.
Ive never heard of an exception to the code to allow dead flat drainage So I can see how any inspector can fail it a technicality of not having fall. regardles of the drawing, the drawing dosent infer that any portion is flat or whether its a double wye screaming with fall with 1/8 bends perhaps street 1/8 bends adjusted with fall . So I could argue a flat double combi fitting is illegal in any code unless a specific wording allows flat or back fall. its pretty nit picky but I hate double fittings on side any time
the double wyes should be ok with ample fall to provide 1/4 per ft fall meaning the main require extra fall so that the branches would have fall. but if its a manufactured dbl combi I get that its probebly not legal. I supose technicaly it would need to be verticle or on a 45 which can count as verticle.
Ive never heard of an exception to the code to allow dead flat drainage So I can see how any inspector can fail it a technicality of not having fall. regardles of the drawing, the drawing dosent infer that any portion is flat or whether its a double wye screaming with fall with 1/8 bends perhaps street 1/8 bends adjusted with fall . So I could argue a flat double combi fitting is illegal in any code unless a specific wording allows flat or back fall. its pretty nit picky but I hate double fittings on side any time
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