Notch depth for 22mm pipe

[Rogeranerley]

I'm running 22 mm copper c/h piping across 45 x 175 mm joists at 400 mm centres. The joists are across a 3.2 m void. BC were OK with using 150 mm but, belt and braces suggested I use 175. The walls of the piping insulation are 13 mm thick. Given I have a little bit more joist depth than strictly required, the question is should I cut out notches to a depth of 35 mm so that the boards just touch the top of the pipe insulation or should I cut out just 25 mm and trim the insulation tops?

 

[spareshunter]

Void underneath, run pipes under joists and clip over lagging?

 

[BigSnoopy01]

your allowed notch depth is approx 22mm. dx0.125

 

[Rogeranerley]

Thanks spareshunter & BigSnoopy01

I'm going to fit below the joists as it's less effort and will retain the joist integrity. I'm now going to insulate with Water Bylaw 49 - 19mm walled on 22 & 25mm on the 15 pipe.

I'll use the notching depth info for some pipe work I need to do in the upstairs bedroom. My joists there are 7 x 3s. Does this make any difference to the calculation BigSnoopy01?

 

[Elkato531]

As already mentioned, max notch depth is 1/8th of the joist depth.

Also, its frequently ignored but, there is an allowable area for notching; measuring away from the wall, between 0.07xspan and 0.25xspan. On either side of the room.

 

[polesapart]

25mm holes drilled in the centre of the joist would be pragmatic: JG (or Cu with many st. conns and few wisps of felt).