Damp Proofing Question

Hi i need help to identify a cause of damp on an exterior wall under the window seal.

I first noticed it 2 about months ago and did nothing. With all the rain recently the damp areas has increased to the whole area under the window seal wall.

I thought it maybe due to a leak in the gutter but don’t believe this is the cause, as I filled the whole and leak still remained. Someone mentioned it could be a leak though the window seal so have re-sealed the area and tapped it up until dry. However the damp area is still increasing.

Any ideas on what can I try next?

Thank you in advance for you assistance.

3 Answers

Without see`ing it,its a tricky one.
Possible that if excessive damp/water has entered the area and now its weathertight and sealed the moisture has to go somewhere,so its escape may be internal!
Is it a 225mm solid or cavity wall? Rendered maybe?
Is the internal plaster a lime mix or carlite?
All these can add or alter the drying process.

Good luck.

Scott Cannon.

Answered 20th Jun 2011

Cannon Preservation Ltd

Member since 21 May 2011

Hello, I agree with Cannon Preservation , the only way you will find out for sure is to employ a specialist to take a look ie Cannon or dampuk.net
is the window sill projecting far enough away from the wall?

Best advice is get a professional to take a look

Answered 21st Jun 2011


Member since 25 Nov 2009

You are better off getting someone to have a look who knows what they are loooking for and hopefully trace the leak? there are so many things to look for?
It can also be differant from window to window in the construction and material its made of? save urself a lot of trouble and time and get someone in.
Its penatrating damp so should not be too hard to find and repair, as its got to be coming in from somewhere around the window? yea all around the window? water could run from the top, around the frame and settle under the sill, solid framed casement window and UPVC are a couple. may be more of a problem if U have cavity walls? Just watch out someone dont try and catch U? its common sense...

Answered 23rd Jun 2011

Pimco, property improvement and maintenance co.

Member since 30 Jul 2008

Need help with your project?

We have tradesmen ready to help you. Post a job, read reviews and hire today.

Post a job

Need some help?

Post a job on MyBuilder to find quality, local Damp Proofing Specialists who can help you with your project.

Search all questions