finishing rough in trench


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Old 11-14-04, 09:21 AM
gyroking
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finishing rough in trench

Hi. Was curious on any info or suggestions about finishing off the rough in plumbing installed in a basement after digging the trenches and installing the rough in plumbing. 1.What would be the best filler to use? I could break up the old clay that was dug out, and use that. Would it be o.k. to use the small chunks of concrete on top, that was dug out or is there something else recommended? 2.Is there any special prep. recommended with the stubs coming out of the concrete before pouring? 3.What would be the best way to prep the sides of the existing concrete trenches, for the best results? Thanks
 
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Old 11-14-04, 09:50 AM
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I would use sand for backfilling the trench. You do not want stones as they could move later and damage your piping. Some codes require it. In Florida we wrapped 1" thick Armaflex insulation around the stubs the full depth of the concrete to remove the risk of movement later that might break the PVC pipe. It also can be removed (the amount you need) to install your floor flange for the toilet. Don't know if it makes a world of difference but you could drill some holes in the sides of the trench and insert steel rods to make sure the new concrete doesn't move after a time. Other Pro's may have better ideas so watch your post for more thoughts. Good luck.
 
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Old 11-14-04, 11:49 AM
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Ok we use 3/4" minus fill here, good stuff to work with and compacts nicely.

Protect all pipe/s that will pass through the concrete, with some type of wrap, we use a foam style wrap.

When setting the closet flange this is what we do here, know your finish floor height, once known cut the toilet riser 1/4" below that point. glue on the closet flange, this should set the flange a correct height when all said and done.
 
 

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