Pipes through this Joist?

[OhGranny]

Hi
It would really help if I could get these pipes through this joist without running miles of pipe!!
View media item 20399The joists are 220mm x 50mm over 4.3 mtr span.
I believe I can't notch them - but could I drill two 25mm holes in the centre to get them through?
Photo shows where the partition has come down it is just about in the centre of the 4.3mtr span.
View media item 20401I am putting a partition at right angles to the one taken down and would like to hide the pipework between the vertical studs.
Any advice gladly welcome - as long as you don't say "Stick to the day Job"
G.

 

[Nige F]

www.eastdevon.gov.uk/bc-guidancenote7-notchingofjoists.pdf Couldn`t find one for Leeds

 

[OhGranny]

Cheers Nige
Looks like I may have to turn the pipes at 90 degrees - back to the side wall in a U and come back into the centre - then down. Ah well better than bringing the house down I suppose!