Soil Pipe Join Drips

[Chetz01]

So I recent got around to decorating the spare bathroom its always had a spot on the ceiling where the previous owners said they experienced a leak but had fixed. Anyway i came to sanding the spot down for a new coat of paint and noticed some dampness.

http://imgur.com/a/4dBSo

Upon investigation in the loft I found that horizontally running soil pipe venting out to the roof via a Manthorpe Flexi pipe setup.

http://imgur.com/a/FJet3

http://imgur.com/a/aGnSS

I sourced the leak and dampness coming from where the flexi pipe joins the PVC pipe, as the picture shows below it looks like someone has taped it together and there isn't much angle so rain water or condensation maybe collecting. The actual amount of water is a few drips when it rains (i think) hence why its not noticeable too much in the bathroom below, coincidentally if it does drip to the bathroom it goes straight into the bath tub! (note the plank I put in so i could inspect)

http://imgur.com/a/nuFIt

So whats the best way to fix this? I would like to have a go myself but if its a tricky job then happy to call a pro (just don't know which trades person to call e.g. roofer? plumber etc

I am happy to join pipe together and create solvent joints if needed, just want to get the design right as i hate working up in the loft!

 

[omega015]

Looking at the images/water spots, the water seems to be coming from where the vent exits the roof. Or to me it does anyway. Are you able to get a good look at exactly where water is dripping from (probably best when raining outside)? It could be running down the pipe from the vent and then just dropping at that tape. Or water getting in from the vent outside and then escaping at bad tape joins.

You need a better adapter to join that flexi to the soil pipe.

You could get something like the below and remove the vent to outside and have it tiled back over, as long as there is air getting into the soil pipe that is the main thing.

http://www.screwfix.com/p/floplast-af110g-push-fit-air-admittance-valve-grey/78150

 

[Chetz01]

interesting you may well be correct Omega015, to the right of the flexi pipe about half way up there was a wet patch if does show up on the picture to but I could feel no water in or around the top of the pipe so there might be some ingress in from a dodgy tile. I'll have another check tomorrow morning.

Can that Air Admittance valve be attached side ways on or do i need to angle the PVC pipe 90 degrees first?

 

[omega015]

If it has good air flow all around and unlikely to get blocks by insulation etc... then I cant see why sideways would matter, but see if anyone can offer a more concrete answer. But if the water is getting in from the roof, changing to the air admittance alone wont solve the issue and you will need to seal the roof/tiles.

 

[Hugh Jaleak]

Do not replace the open vent with an AAV, it is asking for trouble. Drains need to breathe, an AAV only allows them to breathe in! Building regs also state the head of the drain must be ventilated, so that vent is there for a reason.

Even if you did fit an AAV you still have the issue of the hole in the roof to deal with! I suspect the Manthorpe vent tile is the same profile as the roof tiles, so I would be looking at sealing that up if water is getting in internally, possibly extend the soil pipe slightly, fit a 90° bend, then reattach the flexi, that way any rain getting into the vent will disappear down the soil pipe.

If this cannot be done, you may need to look at removing the vent tile, and replace with a weathering slate, then extend the rigid soil pipework up and through the roof. I'd probably look at a Plumber to do it initially, may not need to replace any tiles with luck.