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Old 08-10-2011, 08:40 AM   #1
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VA code says 1.5" inch pipe on shower drain


I'm building a custom shower on a basement concrete floor that will use a sanishower system. The state of Va code states that 1.5" pipe can be used for the drain. However I cannot find any 1.5" shower drains. I really don't want to use 2" pipe because of the limited vertical space. I have built a raised floor using 2 x 6's to account for the plumbing under the shower. Using 2 pipe the raised floor is not high enough. The drain will go through the wall under the shower and into the utility room where the sanishower unit will be. My question is, can I use a reducing bushing in the shower drain to make it 1.5 inches instead of 2 inches. This will be inspected by the county so I want to make sure everything is up to code.

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Old 08-10-2011, 10:04 AM   #2
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VA code says 1.5" inch pipe on shower drain


I would use 2" Pipe anyway. When it gets clogged with hair and soap scum it will be easier to put a snake through the trap.

Trust me, it will fit.

Post a picture of the location you're trying to put it and the pipe you're working with.

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Old 08-10-2011, 10:31 AM   #3
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VA code says 1.5" inch pipe on shower drain


I will post a picture this evening after I get off work.. Dry fitting the p-trap and shower drain together it looks like I need another 1 to 2 inches in height to clear the plumbing using the 2 x 6 raised floor..
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Old 08-11-2011, 12:07 AM   #4
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VA code says 1.5" inch pipe on shower drain


What's the material below the raised 2x6 floor? Concrete or wood?

Either way you can take some of it out for the bottom of the p-trap to sit in so that it will fit in the joist bay.



I believe the 2" p-traps we use are a vertical dimension of 7-1/2" so they should fit in a 2x8 bay, but 2x8 now are 7-1/4, so they don't anymore. At any rate, the amount of material you need to remove below it is pretty small.
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