Shower waste pipe size

DublinDilbert

I'm looking at changing a shower tray for a complete shower enclosure. I want to put the enclosure on the floor and not raised up like it currently is.

The problem will be to run the waste through 3-4 joists. I'm familiar enough with the regulations on drilling joists and may add ply / steel to reenforce the joists.

I'm wondering would it be possible to use a 32mm (1" 1/4) flexible waste for the section which goes through the joists. The shower is triton power shower, so not a massive flow. Has anyone seen this done before?

https://www.screwfix.ie/p/mcalpine-flexcon1-flexible-connector-white-white-32mm/38473?gclid=EAIaIQobChMIpo7h4c7x7QIVTOvtCh1yNQA3EAQYASABEgIfbvD_BwE&gclsrc=aw.ds

corkgsxr

No. Needs to be next size up

DublinDilbert

corkgsxr wrote: »

No. Needs to be next size up

Thanks, 42mm hole should be ok, but I would reenforce the few joists too. Has anyone ever used a flexi like the one above for this?

greasepalm

One issue we had was bath and sink outlets went out through wall over extension roof,now floor is deeper new pipe has a long way to flow and had to go under bedroom floor to exit into drain through wall.Flow is not great and the odd time pipe needs cleaning out.

DublinDilbert

I'm wondering if a flexible waste like this would work:

https://www.heatmerchants.ie/hepflex-flexible-waste-pipe-40mm-3m-f03651

10-10-20

You're not going to get a laminar flow with that pipe.

K.Flyer

DublinDilbert wrote: »

I'm wondering if a flexible waste like this would work:

https://www.heatmerchants.ie/hepflex-flexible-waste-pipe-40mm-3m-f03651

Do not use that.
The pipe needs to be straight with a gradient.
If you use that flexible pipe in the way you are thinking you are going to have dips which will cause headaches and problems after a while.
Is repositioning the tray not an option to avoid the issue with joists?

DublinDilbert

K.Flyer wrote: »

Do not use that.
The pipe needs to be straight with a gradient.
If you use that flexible pipe in the way you are thinking you are going to have dips which will cause headaches and problems after a while.
Is repositioning the tray not an option to avoid the issue with joists?

I could put a slip of mental under the pipe to ensure the constant gradient down, and cable tie this the pipe to it. Metal would be 2mm steel so would keep it's shape and ensure the pipe doesn't dip.

No shower tray is in one corner and the stack is in the diagonal opposite corner. The main aim is to get the tray close to the floor and not on a stand. I need to check how many joists, it's probably 3 or 4 I would need to bridge.

listermint

Why not use a shallow waste. I've used this one successfully in main bathroom , second one going into en suite as refurbing that currently.

McAlpine shallow gulley. Expensive but absolutely quality and worth every penny.

antoinolachtnai

listermint wrote: »

Why not use a shallow waste. I've used this one successfully in main bathroom , second one going into en suite as refurbing that currently.

McAlpine shallow gulley. Expensive but absolutely quality and worth every penny.

The shallow shower trap from McAlpine is an excellent product if you can get it to suit your needs.

listermint

antoinolachtnai wrote: »

The shallow shower trap from McAlpine is an excellent product if you can get it to suit your needs.

Self made tray so ya could put it anywhere I liked