Dehumidifier in Roof space? Condensation

quietheart

We have a dehumidifier running on and off all year round to prevent condensation, dry clothes etc.
I'm a bit fed up of the noise and of emptying it all the time. The house does seem to need it so I'm considering one of those systems that fit into the roof space. I don't know what they're called and can't find them online (as i'm explaining it so badly....) but I've read about them on here in the past.
Does anyone have this system or fit it and would you recommend them?

BertieUK

We had the same problem in our last house where the roof area suffered from condensation.

We had roof vents fitted in the soffits, plus ventilate roof tiles fitted along the ridgeway of the roof, and hey presto no more condensation.

My brother-in-law had the same problem in his top floor flat and he fitted a dehumidifier with a hose fitted to let the water to run out into the gutter.

Regards

BobUK

Mr_Ted

Sounds like a more serious problem than you may think, there should be no need for a dehumidifier in a roof space!

Condensation is caused by 2 factors, RH (relative humidity) and temperature.

These are the factors that need to be addressed.

The 1st thing I would look for would be either a roof water storage tank without a cover or insulation or a leaky roof?

Then consider insulation and ventilation!

You can determine where the problem lies by measuring the 2 factors and checking them against a Dew Point graph, as the relativity of the 2 factors can be changed to eliminate the Dew Point, which is the point at which condensation occurs!

http://hyperphysics.phy-astr.gsu.edu/hbase/kinetic/relhum.html

iamcornholio

They are called positive pressure fans, and makes include Drimaster (Nuaire), Xpelair, Greenwood

They are very successful, but if the condensation is being produced mainly by you /your lifestyle, as opposed to the building construction, then you will also need to change how you do things as they wont be some magical panacea

greyteam1959

quietheart wrote: »

We have a dehumidifier running on and off all year round to prevent condensation, dry clothes etc.
I'm a bit fed up of the noise and of emptying it all the time. The house does seem to need it so I'm considering one of those systems that fit into the roof space. I don't know what they're called and can't find them online (as i'm explaining it so badly....) but I've read about them on here in the past.
Does anyone have this system or fit it and would you recommend them?

Thish is what you want.........read all about it.
http://www.nuaire.co.uk/Product/Residential_Products/Positive_Input_Ventilation/Drimaster_2000

Absolutey briiliant, had mine for over 15 years, easy to fit cheap to run AND they work.
HTH

quietheart

mervyn11 wrote: »

Thish is what you want.........read all about it.
http://www.nuaire.co.uk/Product/Residential_Products/Positive_Input_Ventilation/Drimaster_2000

Absolutey briiliant, had mine for over 15 years, easy to fit cheap to run AND they work.
HTH

Thanks, I just need someone to fit it now!

quietheart

iamcornholio wrote: »

They are called positive pressure fans, and makes include Drimaster (Nuaire), Xpelair, Greenwood

They are very successful, but if the condensation is being produced mainly by you /your lifestyle, as opposed to the building construction, then you will also need to change how you do things as they wont be some magical panacea

How would I go about finding someone to fit a Drimaster system?
Thanks

societys_child

The main cause is warm moist air rising and condensing in the roof space as it's colder up there.

I cured it by fitting a sealed loft hatch (replacing the badly fitting old wooden hatch) and ensuring that any gaps where pipework, wiring etc passed up into the loft were properly sealed (airtight) This included behind the ceiling light fittings etc. That was 6 years ago when I bought this property, not had any problems since.

Cost:
Drop down hatch £20 - (B&Q had 'em half price)
A bit of filler.
A few hours of my time.

fluffymuffy

I thought the original post wasn't about condensation in the roofspace. I thought it was about putting a noisy dehumidifyer up there to get it out of the living space.

societys_child

Yeah . . I read the op . . . then I read the second post

We had the same problem in our last house where the roof area suffered from condensation.

By the time I'd read all 7, I musta been confused

or I could just pretend I was answering the second post

. . anyway, it might help somebody :j