I am installing a basement bathroom and am going to connect to an existing septic system via a new line out of the basement under the slab and footing to the outside. Under the slab in the basement is going to be 4" PVC, but code says I need a 5' section of 4" cast iron under the footing. I am also going to use 4" PVC outside to the septic. I picked up the cast iron and connectors but was wondering if what I have is correct before I go ahead with the installation. Attached are pictures of what I have.

I will have more questions about this, but this is going to kick-off my project.

Thanks.

http://i651.photobucket.com/albums/u...714091847b.jpg

http://i651.photobucket.com/albums/u...714091847a.jpg

http://i651.photobucket.com/albums/u...0714091847.jpg

You are correct with the cast iron hub and neoprene donut (1st image you posted).

You are not correct where you transition from cast iron to PVC...

You will want to double check with local codes enforcement but the best transition coupling to use here will probably be to use a 4" FERNCO COUPLING... see 1st image. Although used frequently as a repair clamp this clamp is specifically designed for underground use.

Otherwise, you may be required to use a 4" cast iron x 4" PVC SHIELDED CLAMP... 2nd image.

Let us know when we can help more...

MARK

Seeing how both ends of the pipe will be underground, one outside and one under the basement slab, I want to go with whatever is the best solution. Is that second solution you showed a no-hub band? Would it be better to use that on both ends and cut off the belled end of the cast iron? I like to err on the cautious side.

A no hub band cannot be used here unless you purchase a specific PVC to NO hub transition fitting... then you can install a no hub clamp.

I posted a SHIELDED TRANSITION CLAMP... mostly used indoors , however.

I think best bet here will be the FERNCO CLAMP (see image)... made specifically for underground piping like this! I am betting that it may be best to cut off the hub, too... some people have trouble connecting the donut type to pipe.

Be clear, however, that this is a tricky answer because some inspectors simply don't like a certain clamp type. If this is being inspected ask your inspector what he wants... TO BE SURE!

MARK

Thanks for the help. To recap, I will use the Fernco Clamp on both ends and cut off the one side with the belled end. This is the most reliable method, right? Having these pipes underground where I can't get to them again scares me.

Quote:

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Originally Posted by adkhkr

Thanks for the help. To recap, I will use the Fernco Clamp on both ends and cut off the one side with the belled end. This is the most reliable method, right? Having these pipes underground where I can't get to them again scares me.

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If it is outdoors and buried, then you are better off using the Fernco.

If you are still concerned about the connection, then install a PVC clean-out a foot or so before you make the transition to cast iron and bring the clean out up to finished grade for future access.