Putting a hole through a joist

[kestrel]

 

I want to put a hole through the joist in the narrowed position in order to run a 50mm shower waste through to the stack

its a 63X200 joist and from what i can measure under the floor broads is at least a 3m span.

 

Its close to the end of the joist which is my concern.

Was wondering if it might be doable if i reinforce the joist either side with thick ply, glued and screwed in place before drilling through the joist and ply

 

[MikeSharp01]

There are standard metal fixings from Simpson Strong tie for this have a look here: https://www.strongtie.co.uk/products/detail/i-joist-hole-support/317 for I-joist there must be an equivalent for plain joists - found this one stateside: https://joistrepair.com/pages/applications

[Bonner]

Not a problem drilling 50-60mm hole in a 200mm joist as long as it is mid depth. A bit of reinforcement won’t do any harm.