Hi all. I’ve recently had a piv unit installed and it’s blowing out 70% humidity. Our house sits at about 65% so had this unit was installed as I was advised it would help with our mould and condensation issues. It seems to be having no effect on the humidity level in the house. I have been up and installed some lap vents in the hope this would help bring the humidity down but doesn’t seem to have had any effect. While I am aware the piv is not designed to filter out humidity I was told it would push the humidity out of the house. I’m at my whits end with it and have forked out a lot of money to have the same results. Any ideas on what I can do?
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Piv blowing out 70% humidity
- Thread starter B6NHM
- Start date
The water is coming from somewhere. Is it a leak? Pipe? Roof? Bathroom? Sink? Radiator? Wet laundry? Spilling gutter? Broken drain? Hidden pipe under the floor? Sauna? New plaster? Water tank?
Shut all the internal doors, and the windows, and on a cold morning, see which room has the most condensation.
Shut all the internal doors, and the windows, and on a cold morning, see which room has the most condensation.
We had a bathroom extractor fitted at the same time that vents to outside so would like to think it’s not that. We have been mindful not do do the laundry in the house as that really pushes our humidity up. I don’t think there are any Brocken pipes and not sure on the gutters.
What's the humidity outside today?
Around 93 % but how that relates to rh humidity that my meter reads I’m not sure.
Probably over analysing it.
The PIV will help to reduce condensation and mould. The RH in the home will vary from day to day, what matters is condensation. If the PIV has been running for a couple of weeks and you still have condensation on the surfaces which were getting mouldy before the PIV was installed then you still have a problem which will need another solution. If the PIV has been installed for less than 2 weeks then just leave it on and give it time. If you have 65% humidity and no condensation then that is normal in the UK at this time of year and no cause for concern.
I've had a PIV installed for a couple of years. No mould or condensation since it was installed but today some rooms are sitting at 78% RH. Everything is fine.
The PIV will help to reduce condensation and mould. The RH in the home will vary from day to day, what matters is condensation. If the PIV has been running for a couple of weeks and you still have condensation on the surfaces which were getting mouldy before the PIV was installed then you still have a problem which will need another solution. If the PIV has been installed for less than 2 weeks then just leave it on and give it time. If you have 65% humidity and no condensation then that is normal in the UK at this time of year and no cause for concern.
I've had a PIV installed for a couple of years. No mould or condensation since it was installed but today some rooms are sitting at 78% RH. Everything is fine.
Thanks for the reply. I have seen any condensation on the windows yet. Surely at 70%+ humidity that is bad for your health/lungs etc?
70%+ humidity is above the ideal range, but it's a temporary situation. It isn't going to shorten your life and, if it is temporary, it isn't going to damage the fabric of the building. Every time you go outside in the rain your lungs are subjected to humidity above 90% but you don't suffer any lasting health or lung issues as a result.
Even a little condensation on windows a few times a year wont do any harm.
Your PIV seems to be doing its job adequately by moving a bit of fresh air around the building. You will know in the long term if it is working by checking occasionally for any mould on walls or ceilings, especially in the corners of rooms.
Even a little condensation on windows a few times a year wont do any harm.
Your PIV seems to be doing its job adequately by moving a bit of fresh air around the building. You will know in the long term if it is working by checking occasionally for any mould on walls or ceilings, especially in the corners of rooms.
It's not the level of moisture which is of concern, it's the mould spores that you need to be concerned about, and mould is promoted by there being cold surfaces, onto which moisture can condense out. I have absolutely no issues, but my recorded indoor RH, normally sits between 50 and 70%, year round.
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I have never measured humidity levels in my home or even considered doing so.
(It’s warm and dry and has no mould.)
(It’s warm and dry and has no mould.)
Nor had I, until I got involved in weather stations and feeding weather reports in. Most decent systems include internal, and external temperatures, plus humidity reporting and logging. Interesting, see how cooking, baths and showers, affect the indoor humidity levels.
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