We found the gutter had been overflowing inside the cavity. We cut back bricks and installed a DPC and capped with a plastic coated steel flashing so no water can enter the cavity even if the gutter blocks and overflows.
We see the fault on most terraced houses that have a gutter sat on the brickwork as in photo.


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Thanks, this site is very helpful.
Thanks glad you found it useful it’s definitely the way to stop it leaking into the house walls