Loft Condensation - Help

Lisapete

Lisapete

Lisapete

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21 Sep 2013
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Lost has had extra insulation fitted. I poped up the other day and everything wet. There was water and droplets all down the rafters and felt.

What can I do
 
Can you post a picture at all? do you have any eaves ventilation / ridge ventilation fitted? is the new insulation touching the slope of the roof i.e blocking the route to the ventilation if fitted?
 
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I can try and get some. It's a 7 year old new build house. Never had hthianissue till new insulation went in. I'm guessing it's blocking some vents on the side.
 
I had this exact issue a week ago. In our loft we have two cold water tanks and one smaller expansion tank. They are plastic vessells and the lids which should be clipped tightly in place had all come off. I assume it was the result of some temperature variations causing some deformation. I put them all back firmly in place with the help of some duct tape and left the loft hatch open for a day. It is now bone dry again.
 
Maccapacca said:
I assume the insulation now has blocked the eaves ventilation which is very common.
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If it wasn't like that before the extra insulation got fitted - definitely this.

I had a problem with condensation in the loft once and it turned out to be the vent above the en suite shower that wasn't secured to the extractor fan pipe so was just venting steam into the loft.
 
As stated, sounds like the ventilation is blocked with the new insulation. You need to make sure there's gaps at the ends where the vents are.
 
I can help with this first hand...

Last week I had the same problem.. recently had cavity wall insulation done and noticed higher amounts of condensation on the house... went into the loft and water was dripping from the felt.. not lots but noticeable.

I went around and checked the insulation and some muppet had actually insulated the eves and blocked the vents up which would allow fresh air in..

pulled the insulation back from the eves and unblocked the vents and also stuck 15 felt lap vents in just to be sure and within 48 hours it had cleared up.
 
enigma27 said:
I can help with this first hand...

Last week I had the same problem.. recently had cavity wall insulation done and noticed higher amounts of condensation on the house... went into the loft and water was dripping from the felt.. not lots but noticeable.

I went around and checked the insulation and some muppet had actually insulated the eves and blocked the vents up which would allow fresh air in..

pulled the insulation back from the eves and unblocked the vents and also stuck 15 felt lap vents in just to be sure and within 48 hours it had cleared up.
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Not sure I want to go digging and pulling it back from the eyes.

Not so easy to get too.

The vents sound good. I found 2 types. Which did you go for.
 
I get condensation in the loft of my new flat, although I have not had heating since I took ownership in October. Don't worry, today is my first night in it and the heating will be sorted in the week!

The condensation forms on the roof felt (?) under the tiles. I will double check the vents are clear, but it is very difficult as it is unboarded and the pitch of the roof is shallow.

Any other tips?
 
Lisapete said:
Not sure I want to go digging and pulling it back from the eyes.

Not so easy to get too.

The vents sound good. I found 2 types. Which did you go for.
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got them from amazon.. bout 20 quid for 20..

You will need to pull it back from the eves.. that's their purpose.. lap vents wont sort it on their own.
 
just make sure they are no blocked.. if its just an opening where the roof meets the outside wall my roofer mate said leave a few inches of space but make sure no insulation is touching the roof itself as it can transfer moisture.
 
I might be asking an obvious question but why have you had extra insulation installed in the loft? Given it's a 7 year old new build the quantity of insulation up there should have been significant already (i.e. 270mm+) and more than sufficient.

I would recommend against doing a bodge job by just adding vents and instead fix the actual problem in terms of the existing ventilation in the eaves likely being blocked and/or the insulation touching the roof. If you had a company do the insulation get them back to fix it.
 
I have similar issues (as of last night) - when I went to put Xmas decoration in loft.

Currently only 2 suitcases in the loft ontop of the insulation/ rafters. Bottom of the suitcase were soaked and top layer of insulation... however top of the suitcases were bone dry.

Only wet parts were where the two suitcases were sitting. House is a new build (6 months).

Now my guess is it's just warm air rising from house through ceiling and hitting the cold plastic suitcases and condensing?

If so, will this always be a problem? Therefore storage in loft is a no go?
 
^ Surely if it's a (brand) new build you've got X years of "snagging" that you can pull the builders up on? (I'd give them hell tbh!)

Sounds like they're not properly ventilating the void properly and the relative humidity is high (due to cold weather), thus the air will condense.

You should normally be able to store items in a loft space.
 
The Craig said:
^ Surely if it's a (brand) new build you've got X years of "snagging" that you can pull the builders up on? (I'd give them hell tbh!)

Sounds like they're not properly ventilating the void properly and the relative humidity is high (due to cold weather), thus the air will condense.

You should normally be able to store items in a loft space.
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Oh yea it's all covered, and I will be. Just saw this thread whilst browsing some of the DIY and thought I would comment!

Probably doesn't help that new builds retain so much water form all the plastering/ painting, etc.
 
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