Notching the side of a joist?

[Lukusss]

I know the regs for the regular notching of joists, but I can find nothing about notching up the side of a joist. I need to route my cables up past a large wooden beam 4500mm x 400mm, 115mm thick. Do the normal rules apply? 0.07-0.25 of the length and 0.125 of the depth? Or is it a no go?

Cheers

 

[Wilko]

As the beam is a modern manufactured product - why not ring the manufacturer and see what they advise?

 

[bigspark17]

As the beam is a modern manufactured product - why not ring the manufacturer and see what they advise?

Are you serious?? How long do you take to complete jobs, if your going to track down manufacturers of beams and ring them uo to see if you can notch it.? They'd have a right laugh at u phoning up about that! Get on with it

 

[ELECNEWT]

The strength of a beam in the lateral direction is directly proportional to the width (in this case 115 mm).
In the vertical load carrying direction the strength of a beam is proportional to the depth cubed (in this case 400 mm to the power 3 ).
Therefore the vertical load bearing capacity is most sensitive to changes in the depth.

 

[Wilko]

Taking on board Bigspark's feedback - I contacted my glulam beam supplier and proposed a 20mm wide by 10mm deep vertical notch for cables in their 115 by 400 by 4500 glulam beam. Their structural engineer approved it, as long as it was not in the middle 1/3 of the beam. I was pleasantly surprised with the 2hr response time, and by the answer. Of course, this feedback only applies to that manufacturer.

 

[Wonderwall]

I've come over lots of notched joists in my 30 years as a sparky.
And almost , not quite but for nearly all these houses have fallen down.