DIY Doctor

Condensation in attic bedroom after replacing roof

Postby abby.wood » Mon Jan 04, 2021 11:08 pm

Ok so we have an attic bedroom that has a fixed staircase and no door or hatch, so open to the rest of the house. We have just had the whole roof replaced, yey no more leaks in bad weather! However we are now noticing patches of condensation on the walls, mainly appearing over night, query breathing? room is slept in!!! Patches seem to be where the air vents are for the roof I guess it's much colder there. Occasionally like today they have appeared during the day, whilst hubby was working from home up there.
We have purchased a 10ltr dehumidifier which we have on over night and leave the velux window open an inch or so on the catch.
What I want to know is if we need to keep the dehumidifier on 24/7 during colder months and is it pointless having the machine on if the window is also open? the room has a constant flow of air from the house. Any other tips to help with condensation spots would be helpful.
abby.wood
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Postby stoneyboy » Tue Jan 05, 2021 10:38 pm

Hi Abby.wood
There is no point in running a de-humidifier with the windows open.
You need to get your roofing contractor back to identify issue with damp patches.
Regards S
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Postby abby.wood » Wed Jan 06, 2021 11:18 am

Ok is this a roofing issue? There is no central heating on the 1st floor or in the attic except for the bathroom.
No patches appear when the dehumidifier is running or when the window is open.
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Postby stoneyboy » Wed Jan 06, 2021 9:46 pm

Hi Abby.wood
When a re-roof is done where there is an attic room insulation should be added as part of the job. If insulation has been incorporated there should not be any cold spots where can condensation form.
From your description it is difficult to tell remotely what the issue is and using a surveyor may be your next move.
Regards S
stoneyboy
Rank: Project Manager
Posts: 4052
Joined: Wed Dec 10, 2008 6:44 pm



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