Notching floor joists

I'm running 15 mm copper pipe and need to go through 5 floor joists. Is there any limit on how many you can notch in a row?

 

Only if they affect the overall structural integrity of the building.

Blup

 

I'm no expert, but I suppose that the best place to run the pipes would be in holes sited half-way between the top and bottom of each joist, rather than notches in top or bottom.

 

The trouble with that is you have to chop the pipe up into sections to pass it through the holes. With notching the whole length can go down across the 5 joints.

 

Oh yes of course, unless you use flexible pipes and you're installing mains wiring. Even then, I think it might be difficult to drill the holes unless you have a 90 degree attachment for the drill!

 

It's an 8 inch x 3 inch joist and want to notched about 15 mm from the top and 30 mm wide

 

Seeing as this topic comes up quite a bit, does nobody manufacture something as a solution for this?
Thinking of pairs of steel/plastic(?) brackets that could be quickly fixed around a joist to give strength back?

 

Yes but you still have to leave the notch or hole so any plates or brackets would need to be shaped around the alterations.

 

Yeah- I was thinking of premade with maybe 25mm pre cut notch