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What could be causing the damp patch in my new extension

last year

last modified: last year

Having recent had an extension built to extend the rear of our house out. We have noticed that damp is penetrating through into the internal walls. The wall affected is the where the corner of the old external wall is now meeting the adjoining wall of the extension. What could this problem be?

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Comments (4)

HU-245886339
Original Author
last year
HU-245886339
Original Author
last year
last modified: last year
Here is an image.
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I would definitely recommend finding out the sources of damp in the extension before you embark on any project. As was mentioned before - definitely check the guttering as a lot of the bubbled plaster inside seems to be around that area. I once looked at a house which had a line of bubbled plaster inside and, surprise surprise, directly outside on the solid was was a gutter pipe. A good inspection of the roof is worth it - are the lead flashings in good shape? There is also the odd exposed section of brick on your neighbours extension - could that be transmitting water into your party wall? The other thing to consider is the amount if moisture produced in a kitchen - its a lot more than you think and can raise humidity in a house over 60% (therefore leading to mould, etc). Therefore opening windows when cooking, adding an extractor fan are good ideas. You can buy devices very cheaply which will tell you the humidity in a room. It will help you out in the long run - afterall, if you do the rework to the extension the problem may re-occur!
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cannonja
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Guess no vertical DPC barrier cut in or cavity created

Damp is penetrating in !!!

Or possibly issue with lead trays and soakers

Or Broken Tiles on Roof

Numerous possible faults
Ricky Watkins
last year
How was roof tied in? Picture please

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