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The Condensation Season Has Arrived.

les

Registered
Now that the winter months are all but here many of us will notice an increase in condensation forming on windows, even on walls and possibly clothing and furniture. This is all due to something known as the Dewpoint. Without going into great detail this is the point where a body of air cannot retain the amount of moisture within it. When the air contains more moisture than it can hold, it reaches 'saturation point' and when this is reached, the moisture turns back into water and condensation occurs. The temperature reached saturation point is called the 'dew point'.

Windows even double glazed are cold enough for condensation to form on the glass and even the frames inc double glazed PVCU windows. Toilet cisterns containing cold water attracted water molecules to condense on them causing drips and in some cases, people think their cistern has a leak. In severe cases, walls will attract this moisture and mould growth often follows. Furnishing can also suffer from mould growth along with clothing esp leather goods which appear to be ideal breeding grounds for the mould growth.

So what can be done to combat condensation in our homes? Well in less severe cases the correct use of heating and adequate ventilation can help sliding glass covers will reduce evaporation on our tanks, however, these measures alone are often not enough especially with the amount of evaporation from our tanks. Some will use extractor fans and dehumidifiers but they have many disadvantages even heat recovery units can prove very expensive and well out of many peoples budgets.

There is a better answer out there than all the above mentioned. I am a retired local government building projects manager and have a great deal of experience dealing with condensation problems in domestic property inc finding the cause and implementing condensation eradication schemes. Agian, without going into detail I have been involved with advice, decoration, insulation, ventilation and mechanical removal of condensation.

Around 12 years ago I trailed something call positive ventilation PIV or a low-energy Positive Input Ventilation system. I used 2 companies and 5 units from each company were instaled in various age, build type and construction of public sector properties all of which had varying degrees of condensation. The results of the studies taken through the winter months (the time when condensation problems are at their worse) were quite remarkable. The tenants of the properties all completed an extensive before and after questionnaire and all either reported a large reduction in condensation or complete elimination of the problem. Apart from the positive effects experienced in the properties, all reported an improvement in the air within their homes.

If anybody would like any further information just as same goes for any questions.
 

cuprajake

Registered
after speaking to les i have a piv system coming.

going in this weekend.

our house is fairly new in the 15yr old range always noticed a bit of damp round windows etc. id ssy not the best built house.

couple this with a fish tank and a family snd a wife who loves to dry clothes in the house.
 
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steve861uk

Registered
Our house is superbly vented at the mo, thanks to the puppy it is also freezing!!!!!! :eek::mad::confused:

My good lady insists that we have the back door open all the time to prevent accidents on the carpets/etc..

Good luck with your system @cuprajake :)
 

les

Registered
Extractor fans, dehumidifiers are old tech and are far from ideal for many reasons from running costs, inefficiency and other far from desirable reasons. PIV is where it's at.
 

dj23bol

Registered
What is a PIV? How much do they cost? My house in winter is like a damp factory even before I took up reef keeping

Sent from my SM-G955F using Tapatalk
 

les

Registered
What is a PIV? How much do they cost? My house in winter is like a damp factory even before I took up reef keeping

Sent from my SM-G955F using Tapatalk
Below is an explanation from one of the leading companies supplying PIV units. Basically, instead of sucking moisture laden air out of the property as with an extractor fan or removing it and depositing the moisture into a vessel you have to empty daily etc as with a dehumidifier, a PIV unit works in a totally different and more efficient way by pushing it out of the home.

http://www.envirovent.com/specifier/products/positive-input-ventilation/

http://www.envirovent.com/specifier/products/positive-input-ventilation/piv-loft-mounted-unit/
 

hitsmith

Registered
I have had a PIV for a few years now and do find it good for condensation, but even with a pre heater it has a tendency to push the warm air out of your house which can make it a bit chilly once your central heating goes off. To combat this I have fitted a timer so it only runs between 9am and 9pm in winter.
 

les

Registered
I have had a PIV for a few years now and do find it good for condensation, but even with a pre heater it has a tendency to push the warm air out of your house which can make it a bit chilly once your central heating goes off. To combat this I have fitted a timer so it only runs between 9am and 9pm in winter.
The amount of air pushed out is quite small and it is air laden with moisture of course, The unit does not run continuously only when the temperature resulting in condensation drops and is far more economical than say a dehumidifier or extractor fan running even a similar amount of time.

Further info.
http://www.envirovent.com/home-vent.../useful-resources/positive-input-ventilation/
 

AngusMitch

Registered
I have been looking at the Nuaire PIV's in the past couple of weeks as they have very good reviews

Havent decided which to go for, but I will definitely be getting a PIV of some sort to help out bad humidity in the house.
 
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les

Registered
I have been looking at the Nuaire PIV's in the past couple of weeks as they have very good reviews

Havent decided which to go for, but I will definitely be getting a PIV of some sort to help out bad humidity in the house.

Both are good units. However, just one company offers a complete fitting system using it's own technicians, not subcontractors along with a complete 5 year guarantee on the unit and the fitting if that is important to you.
 

doug_amanda

Admin
Staff member
Just ordered a dri-eco-RH from Nuaire and a humidity monitor/controller for the living room based on the information in this thread.
We hired a dehumidifier last week and the house and windows have been bone dry since so hopefully the Nuaire will work just as well. :)
 

les

Registered
not seen much of a difference after fitting a piv system. 370 quid down the drain
In which case somethings not right. There is a long thread on another well known UK forum and lots of people have had them fitted and reporting excellent results. You might want to pop over and check it out.
 
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