How to extend cast iron cleanout with no threads

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Old 03-30-13, 02:48 PM
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How to extend cast iron cleanout with no threads

I have a cast iron cleanout on my main drain line currently recessed 22" below my basement slab. I am finishing my basement and would like to extend this cleanout flush with the slab and pour concrete around the cleanout extension so that the basement floor is level and stable underfoot. Problem is the cleanout access hole is cast iron (I believe, house was built in 1931) and has no female threads. The cleanout hole is approximately 3 3/4 wide, can I use a doughnut to connect to a pvc extension or what is the best way to go about connecting to an extension if its even possible?
 
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Old 03-30-13, 06:53 PM
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Suppose you make an access door, in the new floor & leave it the way it is?
 
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Old 03-30-13, 07:23 PM
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Your best off busting up the floor, cut that T out and install a new PVC TY. Then do what you need to.
 
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Old 03-30-13, 08:11 PM
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thought about an access door, but even with thick ply reinforced still would notice underfoot I think.

Lawrosa, if I were to break up the floor and install a new PVC Y how would I attach the new PVC Y to the existing cast iron pipe?
 
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Old 03-30-13, 08:59 PM
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Old 04-01-13, 02:17 PM
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I have lots of experience with PVC but little with cast iron. I assume I measure the length of the PVC Y with the no hub couplers attached and cut the existing cast iron to fit? How close does the fit have to be? Best to cut cast iron with a sawzall?
 
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Old 04-01-13, 02:33 PM
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Best to cut cast iron with a sawzall?
It will work eventually with a carbide blade. Quicker is an angle grinder. Best is rent a cast iron pipe cutter.
 
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Old 04-02-13, 06:48 PM
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t dug up -looks like 4 1/4 OD on existing pipe. Do I want shielded or nonshielded no hub coupler for this below grade app? Is PVC best material for below grade Y? After new Y in place with extension going to fill with gravel and top 3-4" with concrete. Concerned that adding below grade fitting may be compromised with earth/home movement down the road -thoughts?
 
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Old 04-02-13, 09:18 PM
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Shielded no hub only.....................Use a TY not a Y.
 
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Old 04-08-13, 06:10 PM
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pvc t y cleanout installed. 1st transition from CI to PVC (bottom pic) not as clean as 2nd transition pvc back to CI (top pic). Seems that the two cast iron pipes do not line up perfectly linearly causing first transition to not line up perfectly. I have good seals under straps, screws torqued to 60 in lbs and no leaks. Do you think first transition will hold up over long term?
 
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Old 04-08-13, 06:27 PM
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Sure it should be fine.... Are you going to cement that pit? Make sure you cover the pipe with dirt.

Looks good. Great job.
 
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Old 04-08-13, 07:02 PM
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I agree, that should be fine. Be sure to solidly pack the soil under and around the pipe before completely backfilling the hole. You want the pipe well supported by the soil.
 
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Old 04-08-13, 08:09 PM
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Was planning on backfilling with sand and then about 3" of concrete on top. Is dirt better than sand? Just want be sure underneath YT is supported and no settling.
 
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Old 04-08-13, 10:26 PM
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Sand is difficult to pack into a solid homogenous mass, I'd use dirt.
 
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