Size of core bit for soil pipe?

[GaryMo]

What size of core bit is required to pass a soil pipe through a wall?

I'm going to pre-drill a hole ready for a plumber to connect a toilet into an existing stack and have never worked with soil pipe so am not sure on its outer diameter.

 

[kevplumb]

pipe is 110 or 4"" so 4"" will do
if you want a bit of play use a 5"" core

 

[GaryMo]

Thanks. I think the local electrical wholesaler has a 115mm bit in stock so may chance that as I have to pick some bits up in the morning on the way to a job.

 

[NatB]

If you're doing the hole at a low or high height where you can't get behind drill and sure to keep it straight then use a 4.5" bit or bigger

 

[kevplumb]

115 will do jus fine

 

[kirkgas]

pipe is 110 or 4"" so 4"" will do
if you want a bit of play use a 5"" core

remember the faucet of the fittings is bigger, so it depends whether pipe or fitting is going through the wall

 

[gas4you]

If you need the joint to fit in the hole, which is quite common, I always have used a 150mm core bit.

127mm/5" is only ok for plain pipe.

 

[GaryMo]

The pipe.

Basically, it's a toilet in my en-suite. Soil pipe will leave the rear of the toilet and go straight through a wall. It'll then turn 90 degrees and run on a slight angle downwards for around 1M to an internal stack.

 

[Goldberg]

pipe is 110 or 4"" so 4"" will do

The OD of 110mm soil pipe is more than 115mm.

I'd like to see a video of this joker having drilled a 4" hole.

 

[Goldberg]

115 will do jus fine

Oops - he had another go and still got it wrong.

 

[kevplumb]

still digging View media item 14326