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PostPosted: Mon Oct 08, 2018 9:42 pm 
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Planning to remove some internal ground floor walls which support ceiling joists which span the external walls. SE calcs require doubling up of joists which support bathtub and stud wall on first floor. All fairly straightforward.
However, the existing joists have notches cut for CH pipes and central holes drilled for cables, which once the walls are removed will be in the middle of the span, and in the “non-permitted” zone! Also, when I add the new joists, they would need to be notched and drilled in similar, wrong positions.

Question is- do I really need to remove and replace all the existing notched joists, re-route the plumbing into the safe zone, then fit new joists, in order to comply with BC. Or is there a work-around?

Thanks,
JJ

(DIYer keen to learn)


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PostPosted: Tue Oct 09, 2018 4:42 pm 
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Not sure about building regs but "sistering" the weak joists
should work OK. You bolt new joists to the side of the old one with coach bolts or similar extending well past the weak spot, and at least two each side of the fault. The longer you can spread the load over and more extra bolts you can get the better i would aim to get them about 12 to 18 inches apart as a rule of thumb.


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PostPosted: Tue Oct 09, 2018 6:19 pm 
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Not a se but doubling up the joists should do the trick and add some noggins, some inspectors can be a bit anal with rules and want it done by the book


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PostPosted: Tue Oct 09, 2018 8:45 pm 
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Thanks for the reply’s.

Sounds like my best bet is to get advise from inspector- he will ultimately decide what he is happy to pass.


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PostPosted: Wed Oct 10, 2018 5:05 pm 
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more info needed.

post pics of the notched joists?
supply section sizes for the joists and spans to central supporting wall?
how many walls do you intend removing?
are there any stud partitions on the first floor ?


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