Floor joist next to the wall

[Jupiter01]

Hi All,

This is going to be challenging to describe but will try my best...
I am laying out the Flow and Return pipes through my floor joists (150mm high) and happy with regs on holes, etc. There is one particular situation where I need to go down a wall to feed rads but there is a joist butted against the wall. Not too uncommon I suppose. I need to surmount this and pass my pipes down the wall. There are two 15mm that I need to send down this route. The only solution I can see is a small notch at the bottom of the joist (2*15mm pipes).

There is no other wall that I can send these pipes down. I know it's not the done thing but can I have your views on this please and also whether I could strengthen the joist after doing this.

Thanks in advance.

 

[muggles]

A notch in the bottom of the joist wouldn't comply with regs and therefore wouldn't be recommended. Normally in this situation you'd bend the pipes near the ceiling to get around the joist

 

[Jupiter01]

oh I see...
This will require me to notch the top of the joist and then chase the wall (behind the joist) to pass down the pipes. Have I understood this correctly?

 

[muggles]

No, come down the front of the joist then set back to the wall once you're through the ceiling. You can use elbows to go round it if you don't have a bending machine or want it to be tight in for boxing later

 

[Jupiter01]

I get you. Sorry, I should have explained that I want to conceal all pipes. They will either be in the ceiling void or chased into the wall. Your suggestion would mean that when I turn around the bottom of the joist, it will be visible as it will be below the level of the ceiling plasterboard.

 

[Jackrae]

So that's when you decide to fit a cornice around the ceiling wall interface

 

[Jupiter01]

Like the idea but want to go flush on the ceilings...

 

[Jupiter01]

Hi All,

Would love to hear an approval of my suggestion or an alternative approach as I plan to tackle this over the next couple of days.
Thanks again!

 

[nortonj]

Drill through joist at a 45 degree angle downwards till you hit the masonry.
Then put a chase in the wall.

 

[Jupiter01]

Thanks Nortonj. Would this result in an elbow being buried between the joist and wall? That piece concerns me.

 

[nortonj]

I would put an offset in the copper so that you end up with a straight piece of copper within the chase but below the joist then i would solder a socket onto the copper running down the wall.
No joints behind the joist and will be a bit tricky feeding it through and will have to drill a bigger hole through the joist.

 

[Jupiter01]

Thanks Nortonj. I agree that the swinging the offset around will be a challenge...
Are you averse to going over the top of the joist (notch) and then bending down the back of the joist into a chase? I'm thinking that might be easier to push down than a hole in the joist. What do you think?

 

[dilalio]

You should be able to continue the chase in the wall behind the joist by drilling into it with a large (25mm) masonry bit at a steep angle from above and below and use a mini kango, if you have one, to clear it enough to get the tube in, then notch the joist at the top to get back into the floor. Don't forget to wrap the copper tubes in duct tape before bonding them into the chase.

 

[nortonj]

Depends on the situation really. I've done both methods. Drilling through the joist means you dont have to chase out all the way up the joist. I drill through with a 20mm wood bit then a 20mm masonry bit into the wall the same depth as your chase then chase upwards behind joist.
i sometimes find it hard chasing down behind joist if skirtings in place etc

 

[dilalio]

Agreed