Soil pipe to roof vent options

Calculator123

See picture.

The flexible pipe connecting the soil pipe to the roof vent is torn/rusted. Seems like a flimsy enough job. Flexible pipe appear to be regular heating ducting only - probably only 100mm so just have been really stretched over the soil pipe

What are the best options to replace? Think the soil pipe is 110mm variety

and the more rubberised ducting looks to be the same. It's a very tight space to get in to (dormer roof, right at the ridge section.)

dathi

is this an extractor fan outlet from your bathroom or is it the vent on the sewage pipe ?

Calculator123

https://www.boards.ie/discussion/comment/121112200#Comment_121112200

Hello. It's the vent from the sewage pipe.

dathi

https://www.screwfix.ie/p/flexipipe-pipe-450mm/76775

one of these or an air admittance valve

https://www.screwfix.ie/p/floplast-push-fit-air-admittance-valve-grey-110mm/78150

Calculator123

https://www.boards.ie/discussion/comment/121113374#Comment_121113374

Excellent thanks very much.

Not heard of the valve before. If I pop that directly on the soil pipe, does it completely remove the need to connect to the roof vent?

Calculator123

An additional question. I see these valves need to be installed vertically. The pipe in the original photo in the attic space is at an angle.

However the pipe is also accessible via the crawl space. If I removed a section of this pipe, and popped on the valve, would it also be ok? (see photo below)

(is it easy to pull these sections apart or are they glued together?)

10-10-20

https://www.boards.ie/discussion/comment/121113921#Comment_121113921

Sorry, curiosity got the better of me and I have to ask: I presume that heater is only there as storage and it's not used to heat that area of the attic?

Calculator123

https://www.boards.ie/discussion/comment/121117887#Comment_121117887

Correct, storage. Just awaiting a trip to the recycling centre 😄

Lenar3556

https://www.boards.ie/discussion/comment/121113921#Comment_121113921

If it were me, I would be inclined to use a decent quality flexible like shown above and replace the bit of dryer vent.

Air admittance valves are useful when you’re stuck, but given that all the work has been done to pipe this to free air already, I think fix it.

Calculator123

https://www.boards.ie/discussion/comment/121120356#Comment_121120356

Yes, I think that's the best option. Thanks very much.