replacing soil stack?

Question

with regards to the last question i asked im refitting my bathroom my house was built in the 60,s therefore the soil stack is on the inside of the house running up through the corner of the kitchen into the bathroom then upto the roof its a cast iron soil stack
i need to turn the y section so i can move the toilet to the corner opposite the soil stack
could i cut the cast iron stack down and add a plastic section would be above floor boards due to the joists running in the wrong direction
if you have any ideas would luv to hear them

Answer 1

yes....cast iron is extremly heavy especially the type with the bells that are full of lead...... single Y fitting could weigh about 50 lbs with the lead ....... if the cection goes straight up and thru the roof and you remove a section from below there is a Great chance the pipe above will drop!!!!!!!! it is probably 4" cast iron? if so you can replace it with 3" PVC...... start up high cut it just before it goes thru roof... the tar on the roof should support that short piece......they sell ferncos(rubber clamp that will go from 4" cast iron to 3"pvc) 3" can do a full bath on the horizonal.....when you get all the iron out you can install a new Y...or you can install a T as long as the T is in a verticall position( when the solids go in they drop straight down into the stack) the 3" pvc going over to the new toilet location can only travel 8' with NO ups and downs! other wise you will loose the venting ability of the stack...Cast iron cutting requires speciall tools some of witch are difficult to operate....... also when removing cast iron the inside walls are very brittle and LOT of scale will break off and drop down...A rag stuffed into the Y may help ALOT........you may E mail for any further information

Answer 2

follow the first answer it is quite straight forward to change the cast iron pipe but you need to follow a few safety rules wear goggles gloves steel toes etc.



Cut the pipe with an angle grinder and metal blade 1st cuts you need to make are two cuts about a foot wide to get that section out and block it temporarily with cloth or paper so no debris falls in the drain. You can cut this at the bottom at a place where there is a bracket or its held to prevent it from falling on you.



Then work your way to the rest you can smash it with a club hammer once you have made a few cuts with a grinder not advisable inside the house if you can get cut it neat.



To connect the PVC pipe use a Flexi Waste Straight Coupling the diameter is according to the pipe 4 inch or 3 inch. Put a tee piece at a point preferably one with a rodding eye in case you need to unblock you can open and rod where you need to connect the wc and run a pipe across wherever you intend to keep the wc use fittings where needed but try and keep them to a minimum to avoid blockage.



To connect the WC you can use pan connectors you get a whole variety of them which makes life a lot easier. To connect the sink and bath etc you may need a boss or if you can make use of the tee piece connection then not



Finishing off in the roof you can use an air admittance valve at the top in the loft if you do not want to terminate it outside or you can terminate it outside but it will need new flashing plate with a rubber collar choice is yours. If you use the air admittance valve then you need matching roof tiles to cover the hole.



Best of luck

Answer 3

consider a new stack outside total and get rid of old cast , difficulty would be amending underground pipework .