Drilling joists

[rogerdygas]

I need to fit a macerator and the easiest way to run the 22mm pipe would be through joists rather than throught the loft and down an outside wall.

I can can make upto 37.5mm holes in the beams according to current building regs. From my understanding this can only be on the center line of the joist.

Im wondering if I could actually actually place the 22mm first lot of holes towards the top of the joists and the end ones toward the bottom, in order to achieve a 1% fall.

 

[PrenticeBoyofDerry]

With the material being used (copper tube I assume) The building regulation will allow for pipe placement to be passed through joist at above the centre line. I would have thought the best method would have been to actually notch the joist.
http://niceic.com/Uploads/File3777.pdf

 

[rogerdygas]

No its overflow pipe so plastic. Does this still allow me to place it off the neutral axis?

 

[theprinceofdarkness]

yes. One thing to try out is can you bend the plastic enough to get it into the first hole (the others are then more or less in line). Or you will have to make a hole in an outside wall in line with your joist holes, feed the pipe in from this end then put your 2 X 45 degree bends on in the gap between the joists. Finally making good the hole in the outside wall.
Frank

 

[catlad]

You will regret fitting a maserator and the more bends you put in the faster you will regret it.

 

[kazuya]

it depends on the size of your joists
this might help
http://www.eastdevon.gov.uk/bc-guidancenote7-notchingofjoists.pdf

 

[Nige F]

Overflow pipe is not pressure pipe

 

[Jackrae]

But as catlad says, you will regret it, and the overflow pipe will come into use long before the pleasure of ownership has wained. Apart from that, dumping foodwaste into the sewer system simply overloads the plant at the end of the line - or has that particular waste already been processed by your body