How do I form a seal between these please

[Jupiter01]

My setup is like this. I used a manrose coupler and duct tape on the joint but recently noticed that this leaks...
Th grey pipe is a manrose round duct.
Should I use one of those rubber boots with jubilee clip here?

 

[potterton678]

View attachment 409504
My setup is like this. I used a manrose coupler and duct tape on the joint but recently noticed that this leaks...
Th grey pipe is a manrose round duct.
Should I use one of those rubber boots with jubilee clip here?

Yes, a rubber coupling should do the trick. You need a soft material to make the seal.
Or better still, get a longer section of pipe so that there are no joints.

 

[Jupiter01]

Yes, a rubber coupling should do the trick. You need a soft material to make the seal.
Or better still, get a longer section of pipe so that there are no joints.

That's the longest I could get these 100mm manrose pipes in. Are longer lengths available?
Also, what rubber couplers do you recommend for these 100mm pipes?

 

[JohnD]

You can use soil pipe. It comes with coupler sockets on one end.

Usually in 3m lengths

 

[Jupiter01]

Why do these manrose pipes leak? Presumably the pipe and coupler fittings are designed for this. Should I be using soe sort of adhesive for the coupler fittings?

 

[denso13]

Because they aren't designed to be water tight. Better eliminating the water that trying to work round it.

 

[Jupiter01]

Because they aren't designed to be water tight. Better eliminating the water that trying to work round it.

I thought they were designed to be used with bathroom extractors. Have I got that wrong?

 

[denso13]

Yes, but that doesn't mean water should be in the ducting. It shouldn't condense until it reaches the outside air.

 

[Jupiter01]

Yes, but that doesn't mean water should be in the ducting. It shouldn't condense until it reaches the outside air.

ah, do I need to wrap this in insulation or something similar?
Alternatively, if I use soil pipes and compatible couplers, will that solve the issue? Thanks for your help

 

[denso13]

Insulation will help. Soil pipe will do but the pipe has to slope somewhere or the pipe will just fill with water.

 

[Jupiter01]

Insulation will help. Soil pipe will do but the pipe has to slope somewhere or the pipe will just fill with water.

The pipe eventually connects to a vertical pipe that goes out of the roof. I've also got a decent over-run on the fan to push the moisture through each time

 

[JohnD]

And that's why rigid pipe is better than flexi. You can tilt it slightly so any water runs outside. It has no corrugations to hold fluff or water. In a loft you can wrap it in insulation to prevent condensation.

It's possible to add a drainage pipe to the lowest point but that should not be necessary.

 

[denso13]

I've also got a decent over-run on the fan to push the moisture through each time

It will push moist air out, but not the water once it has condensed in the pipework. I think you'll find the pipe will just fill with water or start dripping back in to the bathroom.