Building drain support above grade

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mrd

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I have a 3in building drain running about 6in or so above grade in a tall crawlspace. The floor joists are 3-1/2 feet above the pipe. What's the best way to support the drain?

I was considering using concrete blocks every 4', but I'm wondering if there's a chance the ground may settle. Plumbers tape hanging down 4' seems flimsy. Maybe tack a 2x4 vertically from the joists, with a strap at the end to the pipe..?
 

Cacher_Chick

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I would use a clevis hangar supported by threaded rod.

PipeHanger_Catalog_May10_Pg32_p260.gif
 

Bsperr

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You can also cut a v-notch into some 1*4 pickets secured vertically from the joists and strap the waste pipe into those with some plumber's tape.
 
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