Bit of a nightmare

[T & H Plumbing]

Customer wants a low profile walk in shower tray started to first fix the pipes and waste, problem is my waste, pulled floorboards up I have about 3 inch gap to position waste and run the pipe out the wall, I was thinking run wwaste thru the wall and connect to a flexi waste, but there is a joist smack bang where Ineed to be coming out and where my waste is, wwhat's depth I can notch a joist for a waste I haven't got my book on me lol

 

[RAW85]

All depends on the size of the joint.

 

[T & H Plumbing]

My waste is 40mm

 

[RAW85]

It would have to be a very large joint to safely accommodate a 40mm waste.

 

[T & H Plumbing]

Joint?? I'm wanting to know what depth I can safely notch out the joist lol

 

[solutions]

Customer wants a low profile walk in shower tray started to first fix the pipes and waste, problem is my waste, pulled floorboards up I have about 3 inch gap to position waste and run the pipe out the wall, I was thinking run wwaste thru the wall and connect to a flexi waste, but there is a joist smack bang where Ineed to be coming out and where my waste is, wwhat's depth I can notch a joist for a waste I haven't got my book on me lol

My waste is 40mm

Not going to happen. Raise the tray.

 

[RAW85]

Joint?? I'm wanting to know what depth I can safely notch out the joist lol

Haha bloody iPhone predicted text!
Maybe have a joint and see what happens to the joist!

 

[T & H Plumbing]

I did say that to the custard but she's adament she wants it low VERY low I'll take my book of regs and point out I'm breaking laws if I do it her way if she still wants it that way I'll take money for the work I've done and politly go

By the way was is the depth of a notch for waste or does it have to go thru a hole saw cut???

 

[Grumpy old Plum]

hi
IF you drill out hole this would have less stress on joist but again you would be advisable to consult with building control or get advice from a structural engineer

 

[solutions]

I did say that to the custard but she's adament she wants it low VERY low I'll take my book of regs and point out I'm breaking laws if I do it her way if she still wants it that way I'll take money for the work I've done and politly go

By the way was is the depth of a notch for waste or does it have to go thru a hole saw cut???

If the joist is deep enough and its sufficient distance from the load bearing wall then a hole saw center joist would be the best way as weakens the joist least. But I very much doubt the joists will be deep enough to accomadate a 42mm hole saw through the center joist would have to be 168mm deep minimum but better if 200mm and not be to close to the load bearing wall or to other notches or holes. without significantly weakening it.

 

[Millsy 82]

http://niceic.com/Uploads/File3777.pdf

This might be of help.

Drilling through the middle you might be able to get away with it as long as the joist is deep enough. Notching it will pretty much be a no no.

 

[Best]

Would it be possible to get a shower tray with a different waste position?
By that, I mean, either get a different size tray or get a different make so that the waste isn't near a joist. I always find out where joists are before I let anyone choose a tray or before stud walls are positioned.
A lot of joists I work with are fortunately near 200mm & I use a hole saw, but only if required & normally where it least weakens the joists.

 

[tolly]

In future, I never order shower trays until the old floors been taken up and I can see where I want the waste. Then I can have a look at what tray I need.

 

[tolly]

e.g if its a quadrant, I know mira flight trays waste are in the right hand corner, simpsons acylic trays are in the left hand corner, claygate artesan slim's trays are available in different waste configurations, one of which is in the centre of the radius and simpsons 25mm low profile trays waste is in the centre of the tray.

 

[tolly]

Save the above pictures aswell, I've just always remembered that for a notch its 1/8 of joist depth, and for a hole in the centre its a 1/4

 

[T & H Plumbing]

Thanks people for the input

She ordered the tray herself but going forward its given me the experience to check first,

I've never seen anything like it, its an old cottage with sucken beams (joists) so the ceiling is attached half way up the joist leaving like 3 or 4 inch below floorboard, she's either gunna have to put tray on a plinth or lower ceiling lol