Notching joist for a pipe

[EddyP]

I need to notch a joist for a couple of 15mm rad pipes, I've found lots of info about notching the top of the joist but can't find anything about notching the bottom, which is where I need to run my pipe, is this ok, or against building regs?

Thanks

 

[seco services]

yes it is against regs to notch the bottom of any joist

 

[EddyP]

doh.

have to find another way then.

 

[seco services]

can you not notch the top of the joist

 

[ChrisR]

You can also go through the middle of the joist idf you can drill the hole - see Building regs. (Online) You can oonly use specified distances from supports - though you have to add a bit of common sense.

 

[EddyP]

This is what i'm trying to do:

As you can see in this pic there is a towel rail mounted on the stud wall, I'd like to run the pipes to this inside the wall, so there won't be any on show under the towel rail.

The sole of the stud wall is sitting ontop of the double joist you can see here:

Hence I can't just drill through the sole and put an elbow on, I really wish I hadn't put the sole ontop of the double joist now, but thought it was sensible.
As the sole is slightly offset, I can just about get a bit of 10mm down from through the sole and into the gap between the double joist and single one, my plan was then to notch at the bottom and put an elbow.
But looks like I can't do that now.

I did consider taking the pipes up into the loft, but of course then there would be a place for an air lock.
The only thing i can think of now, is to take the 10mm pipes across the stud wall to the masonary wall, and then go across slightly behind the plasterboard that is being dot and dabbed onto the masonary, then drop them down into the floor cavity, not a very neat solution though.

 

[grahamderek]

Bolt all three joists together with spacers, at 3 or 4 places.
That will give you enough redundancy to notch 10mm in either direction.
Don't expect a building control inspector to understand such complex(!) matters, just do it.

 

[larrytheleak]

eddyp
why dont you cut out section of sole plate take up floor board then notch top of joists to suit