Waste pipe through flat fiberglass roof

[Skiny]

I need to bring a toilet waste pipe, down through a flat fiberglass roof.

What's the best way to go about this, without causing leaks in the future?

 

[KenGMac]

Skiny, good evening.

Entirely dependent on distance to the main drain and the existing ventilation to the main drain have a look at a "Durgo Valve"

Ken.

 

[Skiny]

Thanks for the reply. My main concern is potential leaking of rainwater into the fiberglass roof, where the pipe comes through. I'll add a drawing to show what I mean.

If I were to use a pipe flashing boot, how would I get a good seal between it and the roof?

The red pipe in the drawing currently doesn't exist and there is no indoor plumbing within the main building.

 

[foxhole]

https://www.roofingsuperstore.co.uk/browse/flat-roofing/pipe-flashings-2.html

 

[freddiemercurystwin]

Any suitable roofer or other competent person will not be phased by this, it just needs to be done properly.

 

[vinn]

As above: ref its a simple task for a competent flat roofer.

Perhaps it would help if you explained how come you intend to route a soil pipe this way?
Perhaps there are better routing alternatives?

As always, a few photos often simplify a solution?

 

[chappers]

Yep I would use a flat roof boot, I would cut away the fibre glass back to the roof deck fit the boot clamp it up and then glass over it again glassing up the boot and then slip a pipe collar down over the top and glue in place