Help, FIL just cut through most of an engineered beam and thinks its fine.

[JoeyT]

Have engineered I beams (wood flange top and bottom and chip board in the middle).

He cut through it to run a shower waste pipe, I can't take a picture just yet but he's cut the entire top flange and taken a 2 inch section out and cut about 30% of the webbing. To top it off, there's an inch hole directly below the cut in the webbing.

Can someone point me to regulations as to why this isn't allowed, I found diagrams but they won't convince him it's wrong. And what do I do to fix this?

 

[freddiemercurystwin]

Each manufacturer will have their own specifics but they will all be much the same.

https://www.jamesjones.co.uk/assets/uploads/files/technical-info/jji-site-construction-guide-sept-17.pdf

look at the diagram in the bottom left

Or shove this under his nose aswell: https://www.cne-siar.gov.uk/media/4131/floor-joists.pdf read the section about Services Through Joists

I daresay it could be fixed like this or similar, though note that's from a US website but the principal remains the same.

I expect he will dismiss is it all anyway.

 

[martygturner]

full depth plywood box , so basically fill in the i beam web on both sides with plywood to depth of flange, glue and screw and do 6 times the notch so 12 inches in length.. Yes you should never do it but it happens, we had three cut half way through by a contractor on a refurb and that was the structural engineers advice...

 

[JoeyT]

Many thanks. I told him I really don't think he should have cut into the flange and he braced it as in the picture. Please let me know if this should be adequate, doubting it is. There's no movement on the floor though.

Last picture is the 2nd joist.

 

[martygturner]

The bracing is to support the floorboards it will do jack for the i beam that need to be supported from the bottom flange to the top.

 

[Lower]

full depth plywood box , so basically fill in the i beam web on both sides with plywood to depth of flange, glue and screw and do 6 times the notch so 12 inches in length.. Yes you should never do it but it happens, we had three cut half way through by a contractor on a refurb and that was the structural engineers advice...

Which means that the pipes will have to be disconnected so that they can be threaded back through holes in the new piece of ply.

How many joists has he done this too?