- Thread starter Jblakes
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Lacan07
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If its lead flashing its usually 'stepped' and tied into the mortar bed of the bricks. You'd have to expose the brick under the render on the right side to do this. Sometimes you see it employed diagonally with mortar applied on the top edge. And sometimes instead of using lead flashing people just flaunch the junction with mortar, which appears to be what you have here. Its not so common these days.
Stevers
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You've got very easy access off the flat roof, so I'd peel it back and fix the problems underneath that mess that are likely to have led to the loose tiles. A cement fillet in that situation looks to be a really rubbish idea, and I would have thought lead flashing much more likely to be successful. Whilst it's traditional to step lead flashing in visible brickwork, in random stone (as here) they're usually installed in a groove parallel to the roof pitch. To me there seems to be less to go wrong with that approach, and in render/roughcast why not do it that way?
Its hard to tell from the photo but it looks like the flaunch just directs the water over the gutter, and straight onto the flat roof. The gutter itself seems to have a cobweb too which supports this. So id guess a better solution would be to remove the flaunch and install flashing as per Lacan, above. This would then result in the gutter being used to its full potential and less rainwater ending up on the flat roof.
Cubist
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water runs off the flat roof with no trouble, the issue i'm having is water is some getting under the tiles between the lead used for the flat roof and dripping into the ceiling below.
The leak comes up about 6inch behind the tiles when the roof was done so i can't really figure out how, but the image above if roughly the area where the leak appears. So its a good place to start.
So looking the best method is to get rid of whatever is there, use lead flashing cut into the wall on the left and extend the guttering to run into the other guttering down the leak flashing?
The leak comes up about 6inch behind the tiles when the roof was done so i can't really figure out how, but the image above if roughly the area where the leak appears. So its a good place to start.
So looking the best method is to get rid of whatever is there, use lead flashing cut into the wall on the left and extend the guttering to run into the other guttering down the leak flashing?
Cubist
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Oops. what happened there. I guess I cut my contribution somehow before I hit the 'post' key.
Ah well, to NOT repeat myself... assuming you have access to the loft space it should be easy enough to confirm if water is being driven under and over the lower tiles at the roof boundary - I've seen this a few times in the past and it always surprised me how far driven rain can be pushed to over-top the tiles. Remedy may mean lifting a few courses to insert a membrane wide enough to not be broached or, if theres a membrane already in place (doubtful) to make any essential repairs to it. The poorly designed and implemented run off from the flat roof and the flashing should also be addressed, as others have suggested above, at the same time.
Ah well, to NOT repeat myself... assuming you have access to the loft space it should be easy enough to confirm if water is being driven under and over the lower tiles at the roof boundary - I've seen this a few times in the past and it always surprised me how far driven rain can be pushed to over-top the tiles. Remedy may mean lifting a few courses to insert a membrane wide enough to not be broached or, if theres a membrane already in place (doubtful) to make any essential repairs to it. The poorly designed and implemented run off from the flat roof and the flashing should also be addressed, as others have suggested above, at the same time.
So is this acceptable to attach lead to the wall, i know zigzag is better but i assume it wont be that easy when the render comes off.
As for the other image, add membrane alojg the orange line, can lead be used? Add guttering, blue line to connect then with lead flashing underneath and get rid of whatever the green arrow is pointing too?
Am i on the right lines?
As for the other image, add membrane alojg the orange line, can lead be used? Add guttering, blue line to connect then with lead flashing underneath and get rid of whatever the green arrow is pointing too?
Am i on the right lines?
Cubist
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Maybe it's an age thing but this last set of photos has confused me. Where is the flat roof? Discerning angles from photos can be difficult at times but I had understood the flat roof to be above and to the right of the picture with the orange, blue and green lines and the problem was associated with driven water from the flat section of roof. This latest suggests that that is a pitched roof that runs down to a valley between it and the opposite roof and the water penetration is occurring somewhere between the orange and blue lines? Or is the rendered wall to the right a parapet of some kind which is hiding the flat roof?
Puzzled of Ludlow hoping for clarification before I talk to my medics about medication changes.
Puzzled of Ludlow hoping for clarification before I talk to my medics about medication changes.
Cubist
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That makes sense now, thank you. The source of the water is either run-off from the pitched roof finding its way between disturbed and perhaps broken tiles in the first 7-8 courses or, water over-topping the visible gutter and being driven into and behind the render and first course of two of tiles or run-off from the behind what appears to be a parapet wall and gulley above and to the right. The fix is the same as described earlier and as part pf re-seating/replacing the tiles.
Itchinfilth
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Looks like cement fillet has fallen off, not a vent tile.