New build plumbing joists

[Ricardo Napoli]

hey guys, we are starting on a load of new build houses on site just wondering about the joists. I take it you can’t just drill any where for the hep pipe to go through? All the other new builds we have done had the metal web joists so had no problems with pipe runs. Any advice would be good. Thanks.

 

[Aire]

Best diagram I can find for drilling and notching is this one. Also depends on the house type. We've recently built a dormer bungalow and a subby plumber came in and drilled his pipes through the joists. But because the joists formed part of the roof structure, we wasn't actually allowed any holes at all.

 

[Ricardo Napoli]

Cheers Craig.

 

[muggles]

Are they timber joists, or engineered I-joists? If they're I-joists, DO NOT notch them anywhere. Each I-joist manufacturer will have their own drilling guide, but there's one here which will give you a good guide. Scroll to Page 9

 

[Welder]

Interesting. How does one get a fall for waste then?

 

[Ricardo Napoli]

Hi it’s I-joists been told they have knock outs for pipe runs

 

[Aire]

Hi it’s I-joists been told they have knock outs for pipe runs

Yes they do, makes life much easier than drilling joists.