Water on inside of roof in loft

[relicalpha]

Yeah I've been up in my loft this week and also noticed this. Hoping its just the weather and time of year but noticed at the same time that my in line extractor which was fitted just over a year ago has been leaking condensate and had probably about half a litre of water sitting in the ducting. Can't imagine that will have been helping. Rigid ducting purchased and will be installing it myself over the next few days. At least then I know it will be done right! Hopefully that will sort it out, might wack a few of those felt vents in as well though.

This was actually the exact cause of mine above, discovered ducting had been blocked for at least a couple of months and bathroom had vented to the loft instead - now 90% humidity up there Does rigid ducting actually solve it? assuming you have any kind of vertical slope to get to the vent - condensation will run back down right? I'm trying to solve mine but think a condensation trap is the only solution, which is a pain as I have no where near by to drain it...

 

[norm]

This was actually the exact cause of mine above, discovered ducting had been blocked for at least a couple of months and bathroom had vented to the loft instead - now 90% humidity up there Does rigid ducting actually solve it? assuming you have any kind of vertical slope to get to the vent - condensation will run back down right? I'm trying to solve mine but think a condensation trap is the only solution, which is a pain as I have no where near by to drain it...

Is the soil pipe nearby? You can get a saddle strap and small u-bend to tap into it.

On my vent I positioned it directly above the bath and drilled a tiny hole in the cowling to allow water to drip back into the bath. I'm currently reworking the route to the tile vent in the roof however because the inline fan itself was collecting water and leaking it out, so going to have to mount it vertically to stop that happening.

Also trying to join aluminium flex ducting to rigid is a nightmare in itself to get a waterproof seal, there needs to be some sort of rubber gasket but isn't, I can't run rigid all the way as else the vibration from the fan amplifies in the rigid ducting.

 

[relicalpha]

Is the soil pipe nearby? You can get a saddle strap and small u-bend to tap into it.

On my vent I positioned it directly above the bath and drilled a tiny hole in the cowling to allow water to drip back into the bath. I'm currently reworking the route to the tile vent in the roof however because the inline fan itself was collecting water and leaking it out, so going to have to mount it vertically to stop that happening.

Also trying to join aluminium flex ducting to rigid is a nightmare in itself to get a waterproof seal, there needs to be some sort of rubber gasket but isn't, I can't run rigid all the way as else the vibration from the fan amplifies in the rigid ducting.

Thanks, sadly not got anything nearby. Is there anything wrong with using a pvc overflow pipe out a wall/eaves?

 

[norm]

Thanks, sadly not got anything nearby. Is there anything wrong with using a pvc overflow pipe out a wall/eaves?

That is the generally accepted way to route it really out the soffit.

 

[Slade2]

Thanks, sadly not got anything nearby. Is there anything wrong with using a pvc overflow pipe out a wall/eaves?

We did this with the condensate pipe as our boiler is installed in the loft space. We just ran the pipe down the gable wall and out to just above the down gutter, worked really well.

 

[EH75]

Does rigid ducting actually solve it? assuming you have any kind of vertical slope to get to the vent - condensation will run back down right?

I'm hoping it will be significantly better. There will be a slight slope on it so any accumulations will drain back down either into the shower or out of the vent in the soffit at the other end, hence no build up. Also being rigid it won't sag as water accumulates (which then allows space for more water to accumulate I would presume). I have also fully boarded the area for the ducting to sit on as previously some of it was running directly over the insulation which was allowing it to sag slightly. Gonna keep an eye on it and modify as necessary. I think rigid ducting will give better airflow as well which I guess should help.

 

[alexakasloth]

Is there anywhere for hot air to get up into the loft?
We've had a damp patch appear on our hallway ceiling, hot air seemed to be going up along the space with the old pipework from the bathroom where we had the hot water tank removed. It seemed to be causing condensation where it enters the loft,the damp patch was at this point.

 

[Mark M]

Is there anywhere for hot air to get up into the loft?
We've had a damp patch appear on our hallway ceiling, hot air seemed to be going up along the space with the old pipework from the bathroom where we had the hot water tank removed. It seemed to be causing condensation where it enters the loft,the damp patch was at this point.

That’s a real possibility actually! I had a standard hot water tank with a shower pump and recently changed to a pressurised system but there are a number of holes in the cupboard ceiling where the shower pump used to connect. I’ll fill them in this weekend and see if it makes any difference!