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If you want to clip it in the middle you take one board up, insert a dwang (noggin) and clip it.
Its is all down to experience and teaching.
It doesn't weaken the joists it weakens the structure of the building as the flooring ties the house together one joist to the next.
By cutting a line of boards you have cut the tie.
 
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sorry but i call bull on weakening the structure

next your going to say removing plaster board from the ceiling will cause the joists to twist as theres no support there
 
You can call it what you like Shaun but i can guarantee you it weakens the structure hence why flooring, even chipboard is laid break bonded.
If you are ever on a job with a CoW your company will be hit with the bill to lay a whole new floor and i can guarantee that too.
 
I agree that lifting a line of boards is not needed. I only ever have used copper and about 3 boards is usually enough to get a copper pipe in without causing it to bend.
You will be leaving one line of a joint across the entire joist you cut the floorboards at, and it will always mean when you stand above that joist that your weight will not spread across the other joists as the joint will flex.
 
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I'm gonna worry now -so basically I've messed up my brothers floor??? :/

I wouldn't worry about it. No worse than having to cut a plywood or chipboard floor along or on top of a joist for a large piece.
If you wanted to strengthen the floor again, you could run some of new boards across to the next joist to stagger the flooring
 
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Sometimes I have had to lift a lot of floorboards/sheets for soil pipe work or complex load of copper pipework, but if possible I will only lift the floor to one joist on a few small areas, so to keep the rest of flooring still carrying over to other joists
 
Wgaf its your brother, he's not going to sue you but learn from it because somebody might.

We all had to learn the hard way and believe me i've done some stupid things over the years because i didn't know any better. I learned best when it cost me a few grand usually at a time when i could least afford it.

Our trade carries a huge responsibility which no one will pay the premium for. Use your head.
 
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I've got one joint that's leaking.. Seems to take years for it to heat to be able to resolder- already resolder we once and still leaking - what's the best thing to do?
 
I sweat it a second time and was fine after that.. System all up and running now and finally back home!! That was hard work man, but I'm quite proud of myself that I pushed myself to do it. Thanks to all for your help and advice, very much appreciated!! 🙂
 
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And the best bit of plumbing I did all weekend was this beauty!!!!

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A temp solution until next weekend! Lol
 
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All heating, cold and hot water pipework renewed, new boiler, gutted bathroom ready for the bathroom refurb now!! Happy days.. Saving my brother a small fortune in labour costs!!! Lol
 

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