Hello everyone,
We already had the problem in March that condensate was dripping from the bathroom exhaust air duct. The pipe passes through the vapor barrier layer and goes through the uninsulated roof to the outside. It has a bend and includes a "condensate trap" – whether this makes sense or not is unclear.
Last time, the trap was full. The solution was to empty it and, of course, properly insulate the uninsulated pipe on all sides (which the carpenter did).
Now the problem is happening again. From a physical point of view, I would say just wrap more mineral wool around the pipe – or are there better solutions?
The building inspector is hopefully coming by tomorrow to have a look.
Thanks for your tips.
We already had the problem in March that condensate was dripping from the bathroom exhaust air duct. The pipe passes through the vapor barrier layer and goes through the uninsulated roof to the outside. It has a bend and includes a "condensate trap" – whether this makes sense or not is unclear.
Last time, the trap was full. The solution was to empty it and, of course, properly insulate the uninsulated pipe on all sides (which the carpenter did).
Now the problem is happening again. From a physical point of view, I would say just wrap more mineral wool around the pipe – or are there better solutions?
The building inspector is hopefully coming by tomorrow to have a look.
Thanks for your tips.
B
Bieber081514 Nov 2016 07:14Okay, I understand :-). I don’t have a solution for this construction...
In my opinion, adding more insulation won’t help. Unless you maintain a sufficiently large continuous exhaust airflow, the duct will still be cold inside despite the insulation, since it is open at the top.
Non-expert opinion:
You could have placed the exhaust on a (pre-wall) wall, then installed a T-junction inside the wall—downwards for condensate, upwards for exhaust air. The condensate must not create a path that allows sewer gases into your ventilation (as far as I know, it can be drained into the flush cistern).
It would be better if someone experienced planned this. Do you have any legal recourse? What was agreed upon? It somehow sounds like a makeshift solution with your consent...?
In my opinion, adding more insulation won’t help. Unless you maintain a sufficiently large continuous exhaust airflow, the duct will still be cold inside despite the insulation, since it is open at the top.
BeHaElJa schrieb:It was correct to consider the condensate trap in the planning phase. However, the chosen solution does not work. Based on your sketch, my guess is that the condensate trap is positioned too high.
has a "condensate trap" – whether that makes sense or not is unclear.
Non-expert opinion:
You could have placed the exhaust on a (pre-wall) wall, then installed a T-junction inside the wall—downwards for condensate, upwards for exhaust air. The condensate must not create a path that allows sewer gases into your ventilation (as far as I know, it can be drained into the flush cistern).
It would be better if someone experienced planned this. Do you have any legal recourse? What was agreed upon? It somehow sounds like a makeshift solution with your consent...?
No, they always do it like that ;-)
The idea was probably to place the exhaust vent at the highest point. A stud wall or directly on the exterior wall (1.6 m knee wall) would mean it’s much lower. I would be worried that a wastewater vent might cause odors, right?
I think it just needs to be made airtight...
Right now, there’s a paper towel inside, and it’s completely dry.
Let’s see what idea the site manager comes up with.
The idea was probably to place the exhaust vent at the highest point. A stud wall or directly on the exterior wall (1.6 m knee wall) would mean it’s much lower. I would be worried that a wastewater vent might cause odors, right?
I think it just needs to be made airtight...
Right now, there’s a paper towel inside, and it’s completely dry.
Let’s see what idea the site manager comes up with.
B
Bieber081514 Nov 2016 14:14BeHaElJa schrieb:
Wouldn’t wastewater venting cause odors?Yes, exactly, that’s why you shouldn’t combine the room’s exhaust air with the ventilation of the wastewater pipe.BeHaElJa schrieb:
I think it just has to be airtight...Airtight and exhaust air are somewhat contradictory.You won’t be able to completely and reliably prevent condensation (or wouldn’t want to: heated pipe). Therefore, the condensation must be properly drained. There are solutions for this. But it needs to be professionally planned, not here in the forum, nor casually between the site manager and carpenter.
(Out of curiosity: Is the bathroom interior without an exterior wall?)
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