How much joist can be cut out fo CH pipes

AnthonyRad · Oct 22, 2020

Hi all,

Heating engineer has curved 15mm ch pipes where the wall meets the ceiling instead of notching the joist further and putting them at a 90 degree angle so completely hidden when ceiling is boarded and wall bonded then plastered. He explained that he couldn't notch out the joist anymore and the joist was so tight to the wall he had to do it like that.

Had the plasterer round and he will have to build out the wall 40mm, 'double dot and dab' to ensure the curved section of pipes won't be visible. That is a whole lot of extra time and expense and wasted space to build out a whole length of wall 40mm just to hide 2 small sections of pipes especially when I want to be hanging heavy things on the wall in future. (also don't like coving so can't do that to hide them)

Is it reasonable to ask him to notch out more of the joist (size 7x2), even chase out more of the brick behind if needed to put them in at a 90 degree angle. I could even put metal bat straps across the notch also for belts and braces?

Thanks

(the electric cabling resting on the pipes will be clipped up don't worry)

SimonG · Oct 22, 2020

Board out above, drill out the wall down back of joists and away you go. Just been lazy.

ShaunCorbs · Oct 22, 2020

Your not supposed to notch the bottom out but 1/8th the depth of the joist so about 3/4 of an inch max

exedon2 · Oct 22, 2020

If you asked a building inspector how much you can notch underside of joist the answer would be none! Building regs very clearly lay out where you can notch or drill joists.
As has been said lazy job floor boards up neat notch chase behind joist job done everyday stuff.

Scott_D · Oct 22, 2020

Change it to soldered elbows tight to the bottom of the joist.
Cross batten the joist and board over, lowering the ceiling by 20mm ?

townfanjon · Oct 23, 2020

Our job is absolutely impossible to do without notching or holeing joists .
To cut 15 mm off the bottom of that joist is more than ok in my book ,
I am pretty sure the house wont fall down .

AnthonyRad · Oct 23, 2020

exedon2 said:
If you asked a building inspector how much you can notch underside of joist the answer would be none! Building regs very clearly lay out where you can notch or drill joists.
As has been said lazy job floor boards up neat notch chase behind joist job done everyday stuff.

Thanks, if I get him to do as you described will that be ok as there will then be a notch at the top directly above the small notch at the bottom he's already done?

Ben-gee · Oct 23, 2020

Plate the side with 18mm ply once it’s done.

exedon2 · Oct 23, 2020

Spot on ply plate screwed and bonded with one of expanding floor glues (caberfloor or similar) will make best of a bad job.

Keefy · Oct 24, 2020

Off the top of my head it's 1/8th the depth of the joist and ideally no closer than 25% of the span away from the wall. Not always possible I know but yes, straps/plates are a wise idea.

Harvest Fields · Oct 24, 2020

I wouldn’t want to be cutting any more out of that joist.

AnthonyRad · Oct 25, 2020

What would you recommend mate?

gpbeck · Oct 25, 2020

I know a joist is a joist but it is parallel to a brick wall not perpendicular when obviously they carry a greater load. Can the joist not be fixed solidly to the wall with packing between either side??

Ben-gee · Oct 25, 2020

Yes bolt it to the wall.

SimonG · Oct 25, 2020

Aye if you're worried drill and bolt into wall.

siricosm · Nov 1, 2020

Not sure why people are so fond of bending copper pipes rather than using elbows. It seems to be a UK thing.

As someone said previously, just use elbows to get rid of those silly "bends" and you'll be good to go. All that is needed is a 3/4" deep notch in that joist, too bad you can't put the wood back, but as the joist is against a brick wall, I doubt it will be problem.

Love the scorch marks on the bottom of the floorboards, doesn't the guy have a piece of alu or tin to put behind there to prevent that?

Ben-gee · Nov 2, 2020

The reason we prefer bending to using elbows is because we’re plumbers and we like to show it sometimes!
Not to mention the better flow properties and reduction in noise...

john the plumber · Nov 3, 2020

Less chance of leaks when you bend pipes also

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How much joist can be cut out fo CH pipes

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