Reasons for water-penetration?

12 Apr 2005
Reaction score
United Kingdom
Could a knowledgeable roofer or builder confirm what are the causes of the problems indicated in the photos shown here.

Problem is beneath a fourth-floor pitched roof above a rear stairwell, where there is extensive damp penetration. House is 4-storey Victorian end-of-terrace. First photo shows internal evidence of damp on flank wall side of stair-well.

View media item 26737
Next photo was taken in rain, and shows top of flank wall being soaked by rain-water (you can just see the water reflecting). The left hand part of the wall is topped by a parapet wall adjacent to a flat roof. The right hand side of the wall, where it slopes down, is topped by a parapet wall adjacent to the the pitched roof above the stairwell in question. (Sorry for picture quality, it was hard to take this photo).

View media item 26738
Next photo was taken on roof, and shows the flank-wall parapet wall above the stair-well pitched roof. There seems nothing on top of the parapet wall to keep rain from dripping down external face of wall, which is why it is getting soaked in rain, and presumably this is penetrating through into stair-well.

View media item 26739
However, next photo shows there are coping stones on the parapet adjacent to the flat-roof part.

View media item 26740
Next photo shows water-damage on other side of stair-well.

View media item 26741
Next photo shows the other side of this internal wall, where the wall-corner is being soaked in the rain by a trickle of water at the corner of a gutter and the pitched-roof.

View media item 26742
Next photo shows that the trickle of water seems to be the result of a piece of flashing overhanging the gutter in question:

View media item 26743
Next photo shows same lead-flashing from below:

View media item 26744
I am asking this because the whole of this building was extensively renovated/repaired about a year ago, including repairing all the guttering, re-rendering the flank-wall in question, and generally making sure the house was in good order externally. Basically, I would like to know if it's possible to say from these photos that the reasons for this water-penetration can be put down to defects in this repair, which are causing these problems.

Thanks for any useful comments.
Sponsored Links
Sponsored Links
The point where your flashing, two dissimilar roof surfaces, and a gutter meet seems to be the suspect area - photos 7. and 8 area.
There is also a loose "tile" in an earlier photo and standing water in a gutter behind a parapet.
The lead flashing is discharging over the gutter - perhaps the gutter is undersized - but the lead seems badly worked. Presumably, it's for the change in roof planes and materials? Or is it the termination of a valley?

Whatever, you will have to gain access to assess the job and to remedy the situation. Seems quite high for a tower so perhaps you will have to scaff. up.

DIYnot Local

Staff member

If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.

Select the supplier or trade you require, enter your location to begin your search.

Are you a trade or supplier? You can create your listing free at DIYnot Local