Thread: Cast Iron Waste Lines

The home I inspected today was built in 1991.

I was surprised to find cast iron waste lines (exposed under sinks and the exterior clean-out). The vent stacks were PVC. The foundation was a slab.

I was at loss as to why it was being used in 1991. Of course, Tyler Pipe is based here and a large provider.

Was there (is there) a way to install cast iron waste lines that protected or prolong them?

The buyer was a little freaked out about it b/c she'd had cast iron waste lines in another home.

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From what I see around here, cast iron lines last anywhere 70-100 years. Considering the house was built in 1991, their expectancy is down to 50-80 years. Personally, I don't think the buyer has anything to worry about.

I have seen cast iron used in vertical runs in higher end homes. The idea is that it eliminates the noise of the water rushing around inside the walls. The under sink components were PVC.

Originally Posted by Bruce Ramsey

I have seen cast iron used in vertical runs in higher end homes. The idea is that it eliminates the noise of the water rushing around inside the walls. The under sink components were PVC.

True, it is a very common practice in high end residential.

All of the vertical drain lines are run in no hub cast iron and the vents and horizontal drain lines are run in solid core PVC pipe.

If the budget allows for it, we will also wrap the pipe with a sound deadening material like Dexdamp.

Originally Posted by Widdershins Saunders

True, it is a very common practice in high end residential.

All of the vertical drain lines are run in no hub cast iron and the vents and horizontal drain lines are run in solid core PVC pipe.

If the budget allows for it, we will also wrap the pipe with a sound deadening material like Dexdamp.

I would assume (since I didn't dig it up) that all of the lines were cast iron. The house was a single story and the clean-outs in the flower beds were iron too. There again, I'm assuming that the horizontal is cast iron too.

Thanks for the info about the dexdamp.

Found out yesterday that cast iron was required for waste piping up until 2000 in the city limits of Tyler.

Probably due to the fact that Tyler Pipe is a big manufacturer