condensation

johnnyb6

Hi I seem to have a problem with condensation on two upstairs windows. It has only started happening recently. I filled the cavity with issulation during the summer and also installed a stove down stairs. The rooms which I have problem with each have 4 inch vents. I would be grateful for any help.


Thanking you

MicktheMan

There may be a number of reasons for this.
First, check that the wall vents are not blocked by the pumped insulation.
Next, see previous thread here.

johnnyb6

Thanks very much for your help. The vent is open for sure. But is there any reason this is only happening in one room. Will I have to keep window open to solve this

MicktheMan

johnnyb6 wrote: »

But is there any reason this is only happening in one room.

It may be because this is the coldest room in the house or is on the north (or east) side.
If possible improve the heating and ventilation. Also make sure there are no other sources of moisture (e.g. leaks) in this area.
Are there extraction fans and if so are they used/effective.

PremierMoment

There are in the market some dehumidifiers that maybe helps you also, some of them are electric ones and other just have like some small plastics balls, more info http://en.wikipedia.org/wiki/Dehumidifier

johnnyb6

My extractor fans are working well as I hoover dust from them every year and clean them out. I had a few vents in other rooms closed and I opened them the other night and the condensation seems to have reduced a great deal. However the weather hasnt been as cold the last few nights, so jury is still out. As a last resort I wonder will I have to get humidifer.

Thanks again for the advice

MicktheMan

johnnyb6 wrote: »

As a last resort I wonder will I have to get humidifer.

A de-humidifier is only a temporary solution and is not a permanent solution. No leaks and proper heating and ventilation is key.

johnnyb6

when you say proper heat and ventilation, is this achieved by trial and error

MicktheMan

In principle, no; In reality, yes.

"No" because the heating and ventilation systems should be designed taking building fabric, heat and mositure load, climate, building use, occupancy etc into account by a qualified professional.

In reality, most houses' heating system and control are the cheapest that can be gotten away with, with little or no regard to the above and then add poor consrtuction workmanship into the mix. On top of this, occupant behaviour (often based on false economy) plays a large role.

The best measure of whether appropriate heating and ventilation is being employed is to monitor the relative humidity in different areas of the house (during the heating season). If readings are (for long periods (>24 hours)) in the 50%'s then good, in the high 60%'s then improvement required, in the 70%'s or higher then high risk of problems such as mould.

johnnyb6

thanks for all the helpful advice , its greatly appreciated. I will take all your advice into account and keep an eye on it from now on

riddles

Hi,

Like the OP I had cavity wall insulation pumped and since have a problem predominantly in the main bedroom. I would like to get a professional assessment and solution recommendation to make it go away. Any recommendations would be appreciated.

Kind regards,

Kevin

BryanF

riddles wrote: »

Hi,

Like the OP I had cavity wall insulation pumped and since have a problem predominantly in the main bedroom. I would like to get a professional assessment and solution recommendation to make it go away. Any recommendations would be appreciated.

Kind regards,

Kevin

Sounds like a thermal bridge creating a cold internal surface, where perhaps mortar fell into the cavity during construction, or there is a weather related leak outside

MicktheMan

riddles wrote: »

Hi,

Like the OP I had cavity wall insulation pumped and since have a problem predominantly in the main bedroom. I would like to get a professional assessment and solution recommendation to make it go away. Any recommendations would be appreciated.

Kind regards,

Kevin

pm sent