Weather proof bathroom vent on roof - cowl fitting?

I've had a constant build up of water in our extractor fan ducting in the loft. This has been made worse by a tear in the ducting causing a leak to spread.

There doesn't appear to be water dripping inside the loft from the outer edge of the pipe so I think the seal is secure holding the pipe in place.

For whatever reason the rain water is building up in the ducting. We no longer use the extractor fan therefore I'm pretty sure it must be external water (rain) building up.

I originally thought the external vent of the roof or the pipe exposed on the roof might be damaged causing rain water to enter the pipe and ducting. Now I think it might possibly be an inadequate vent cowl (I think that's what you call them!) that was replaced in a hurry by a roofer a year or so ago.

I've attached a picture of this and a link to the item I think the roofer bought at the time (a FloPlast ring seal soil vent ring terminal).

Does this look like the wrong type of weather proof fitting? If so, can anyone recommend something more suitable to withstand the wind and rain?

Many thanks

 

It's wrong. That's just a vent terminal - you want a FloPlast soil extract cowl.

 

get rid of the cage and get a mushroom cowl.

 

Something like this one? This new attached picture is from another part of the house, although I don't actually know what it's for.

Or should I replace this one as well?

Is there any specific suppliers or brands that are better to use? I had a look at B&Q website before but I couldn't see anything suitable.

Thanks

 

Presuming it is a 110mm pipe, this one
https://www.toolstation.com/shop/Roofing+&+Drainage/d250/Soil+&+Vent/sd2849/Mushroom+Vent+Cowl/p70565

or any of these that look like mushrooms, but not the ones with holes directly on their tops that will let some rain water in:
https://www.google.com/search?ei=kB...30k1j0i5i30k1j0i13k1j0i8i7i30k1.0.wzjPrTKRgtQ

 

It might be a daft question but how do these mushroom cowls allow steam from an extractor fan to escape? Its not obvious from the pictures or descriptions.

 

It is a tube that has a cap on it, with the tube held a short distance from the cap.
This means the vents where the air escapes is the gap between rim of cap and the tube.
So air is blown along tube, hits the cap, changes dorection and leaves from gap.

(The gap or vent holes is where the black coloured area is on a real mushroom.)
Sfk

 

Thanks for the advice. I think the mushroom vent cowl looks like a good option. I might replace that other one to be on the safe side.

Are these easy enough to fit or should I get a roofer in? Want to make sure they stay in place with the wind.

 

Thats what they are for... glue the new ones in place.

 

Just a follow up question with this...

So I replaced the bathroom extractor vent cowl with the mushroom one from toolstation (see attached pic).

At the same time I decided to replace the soil vent with the same type of cowl.

I was just wondering if it is actually a good idea to replace the soil vent cowl with this type of cowl that prevents any external rain water entering the system? Is it beneficial to allow rain water in to provide an extra clean of the soil pipes?

Thanks

 

Scott,

I do not see you putting a Mushroom cover on your soil pipe casing any issues.

There is no requirement for (the tiny amount) of rainwater to wash the inside of a soil vent pipe.

And I guess you house looks (slightly) better having both pipes with same cap (although I bet most will not notice).

SFK

 

Thanks SFK that's reassuring to know.

Cheers

Scott

 

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