32mm waste pipe into old cast iron stack

[ChrisCTK]

Hi everyone - new to the forum (and plumbing) so sorry if this is a daft question...

I am trying to fit a washing machine into my house, and will need to sort out a waste pipe. I have worked out that the waste pipe can go through an exterior wall, then outside there is an old cast iron stack (which is no longer used as its been replaced with a UPVC one when the bathroom was moved to the other side of the house). I am thinking of just getting a saw hole cutter and making a 32mm hole into the old cast iron stack, then pushing some upvc 32mm waste pipe an inch or so into the hole in the stack and sealing it around the edges. The other option I have seen is cutting a hole and fitting a boss clamp, but all the boss clamps I have seen are only for UPVC stacks, plus considering that the stack isnt used for anything now I am not sure of the advantages of using a boss clamp over just feeding the waste pipe into the stack and sealing around the edges.

Anyone got any ideas if my plan would work?

Cheers!!

 

[ADM360]

If it has been replaced and the other stack also acts as the vent, then there should be no reson why you could cut it off at ground level fit one of those rubber end capps, like on condesate soak aways, push into cut off cast, fit waste pipe in top seal and your away!! you may need to fit a AAV inside to stop trap being pulled out, but if the runs not that long then may be ok.

 

[PlumbBobBob]

are you fitting the washing machine in a utility room and not the kitchen?

 

[Destroyer2813]

You wanna be 40mm for a washing machine waste for starters

 

[kirkgas]

best option is to cut the cast iron and fit a timesaver joint on it, then a reducer down to 38mm (NOT 32mm) then pipe inside in 38mm plastic

 

[rocketmanbkk]

what about the kitchen sink? Sink in utility room? I am no expert but did mine into the kitchen sink.

 

[PlumbBobBob]

that's what i was thinking and why i asked where it was going.

 

[ChrisCTK]

The washing machine will be under the stairs - there is crawl space under the floor so the waste pipe will be under the floor until it reaches the exterior wall (about 1.5 m between then washing machine and exterior wall). I wasnt sure on waste pipe size, so thanks for letting me know I need to use 38/40mm.

I'm worried about cutting off the pipe - the house is rented so trying to do the job as simply as possible (dont worry - I have got the landlords permission!!).

I have heard about the timesaver joints - any idea how much they cost and best place to get them?

 

[ChrisCTK]

Worth mentioning that the kitchen is on a lower level (3 steps down), with solid floor. I have checked out all the options and there is no way to connect to an existing waste anywhere.

 

[kirkgas]

The washing machine will be under the stairs - there is crawl space under the floor so the waste pipe will be under the floor until it reaches the exterior wall (about 1.5 m between then washing machine and exterior wall). I wasnt sure on waste pipe size, so thanks for letting me know I need to use 38/40mm.

I'm worried about cutting off the pipe - the house is rented so trying to do the job as simply as possible (dont worry - I have got the landlords permission!!).

I have heard about the timesaver joints - any idea how much they cost and best place to get them?

any of the main plumbing suppliers will have them, Grahams, PTS, Plumb Centre not sure of cost, but i know they are worth every penny as they do the job properly

 

[marleyco]

As kirkgas said, time saver is the right choice, but so you know I've fitted a strap to cast and other plumber's have done it too. It's smaller, plumber I know heated the strap and bent it over to create a new fixing hole, other way is to over lap then screw through. Not the prefered way I admit but then compared to a time saver its big savings if not for you then my customer's