Help with a bodge

colm_mcm

I need some info on soil pipe joints to fix a bad job by a builder.
Now I know there are right ways and wrong ways of doing things, but help on fixing something wrong with something less wrong is what I need

Have a kitchen extractor fan that's running up into the attic and out a vent in the roof. The vent was put in in the place of a tile, and has about a foot of orange waste pipe coming out of it (perpendicular to the roof angle) with a jubilee clip holding the aluminium flue onto it.

The issue is that heavy rain is getting in the vent, then running down into the pipe where is building up.
Ideally I'm guessing there should be a flap in the outside of the vent, but there isn't.

What I'd like to do is get a 90 degree bend on there and have a drain hose (which will be no problem to route outside) attached to the elbow at the low point.

Is there any waste pipe joint that has an inlet on it in the bend?

Tom44

colm_mcm wrote: »

I need some info on soil pipe joints to fix a bad job by a builder.
Now I know there are right ways and wrong ways of doing things, but help on fixing something wrong with something less wrong is what I need

Have a kitchen extractor fan that's running up into the attic and out a vent in the roof. The vent was put in in the place of a tile, and has about a foot of orange waste pipe coming out of it (perpendicular to the roof angle) with a jubilee clip holding the aluminium flue onto it.

The issue is that heavy rain is getting in the vent, then running down into the pipe where is building up.
Ideally I'm guessing there should be a flap in the outside of the vent, but there isn't.

What I'd like to do is get a 90 degree bend on there and have a drain hose (which will be no problem to route outside) attached to the elbow at the low point.

Is there any waste pipe joint that has an inlet on it in the bend?

Two 4" 90°bends M&F or a 90 & a 45° will solve it.

colm_mcm

My issue is the water gathering at the lowest point though. As the pipe is angled perpendicular to the roof, there's no way for it to drain back out the vent.

Calahonda52

re: Is there any waste pipe joint that has an inlet on it in the bend?
there is, have a look for a rodding bend, however the hose pipe will reduce the effectiveness of the flow.
u will also need to reduce it down, which can be done
At almost 41k posts u should be able to post a pic or 2 of inside and outside

colm_mcm

Heres what's done so far. Before this, there was a big hole cut in the original felt around where the vent was out, water getting in everywhere, shocking job.

I basically sandwiched new felt around 2 tight sheets of ply cut to the size of the pipe, sealed the hell out of it and bolted the 2 sheets together, then ran the new felt under the old stuff and out over the wall. It's watertight now, but the issue with the water collecting in the pipe and seeping out is still there.


Here's a detailed artists impression of what's going on



And what's in my head

decmeister

change the elbow too a tee and stick a reducer into the tee
use the branch of the tee as your connection to your fan so the water collect in the bottom of the tee where your reducer is and the reduce to what ever size you need and pipe to outside

colm_mcm

Can you realistically get something that'll reduce that to a small hose size?


Would something like this do I wonder?

Don't know if it would be silly expensive or if it would work

CJhaughey

Could you not just drill a hole and stick a saddle on the pipe at the lowest point?
Use that as a drain out the eave or wherever you are draining too.
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decmeister

that is a multiwick with a vent on top
i would not work because the water would not reach the level of the outlet
and yes you can get a 4x2 reducer and then reduce to 3/4 inch and still a hose or use the 3/4 which is the size of a normal overflow pipe

decmeister

ifyou use a strap on boss which is in the last photo you will need an elbow to connect to the existing pipe which is connected to your roof slate fromtyhe other side of the elbow you will need some more pipe which you can drill a hole and connect you strap on boss
you will still need to reduce from this connection to 3/4 or smaller

colm_mcm

So basically if I go with the original idea of a tee,
I stick the existing pipe coming from the roof into a tee. Stick another short pipe the same size in another end of the tee, jubilee clip the aluminium extractor pipe onto that.

The bit i need clarification on.

I'll need:

Short bit of pipe same as coming out the roof to stick in the tee for the reducer to go on?
4x2 reducer, is this a solvent joint?
Short bit of 2 inch pipe?
Another reducer?

decmeister

use a tee to connect to the roof
stick the second piece of pipe into the branch of the tee[make sure the sweep of the tee is sweeping towards the roof]
stick the reducer into the bottom off the tee where the water will collect and not go into you extract
the 4x2 reducer is hard plastic which ewill slip into the tee with some grease
then reduce from 2x3/4 with solvent fittings

decmeister

use a tee to connect to the roof
stick the second piece of pipe into the branch of the tee[make sure the sweep of the tee is sweeping towards the roof]
stick the reducer into the bottom off the tee where the water will collect and not go into you extract
the 4x2 reducer is hard plastic which ewill slip into the tee with some grease
then reduce from 2x3/4 with solvent fittings
does this make sense to you???

Tom44

colm_mcm wrote: »

Can you realistically get something that'll reduce that to a small hose size?


Would something like this do I wonder?

Don't know if it would be silly expensive or if it would work

That will work too.
Only €15 or there abouts

decmeister

it wont do

decmeister

it wont do//// you would need connect 4inch pipe into the piece which should connect to the back of the wc [not a great joint]

colm_mcm

decmeister wrote: »

use a tee to connect to the roof
stick the second piece of pipe into the branch of the tee[make sure the sweep of the tee is sweeping towards the roof]
stick the reducer into the bottom off the tee where the water will collect and not go into you extract
the 4x2 reducer is hard plastic which ewill slip into the tee with some grease
then reduce from 2x3/4 with solvent fittings
does this make sense to you???

Yep! Thanks

Do all tees have those rubber rings in them to seal? Is that the type I'm after?

decmeister

no only the 4inch one

decmeister

most do but ask just to be sure

Pappacharlie

There is a tile available that has a vent designed into it during the manufacturing process. It is shaped like a mushroom and is parelell to the tile itself so water does not enter the extraction pipe. I presume its a flat tile you are dealing with.

colm_mcm

Vent is already in and I'm not changing it as it would be too much work.

jack of all

Just trying to think outside the box here, but could you modify the vent (access from either side?) by using a small strip of lead folded over to create a small drip/ upstand to prevent water been blown down the tile? If you could bend the strip of lead to "p" type profile which could loop over the bottom of the vent, create may a 10mm upstand while still leaving a ventilation gap.....

nmacc

jack of all wrote: »

using a small strip of lead folded over to create a small drip/ upstand to prevent water been blown down the tile?

I think a drain is definitely the way to go. If there are any low or flat spots in the pipe, then condensation will build up at a surprising rate as the warm air from inside meets the cold pipe in the attic. I've seen this on several occasions and insulation the pipe doesn't always resolve it.