I had a new lean-to garage built two and a half years ago. It seemed to be a good job and I was very happy with it. (Only minor glitch I was aware of was that the roof has always ponded at the back, which is visible on the photo below but not related to the main problem).
However, earlier this year, I was in the garage during a heavy rain storm and saw that there was water coming in in multiple places where the new garage roof meets the house wall. My first thought was that the flashing must have failed, so I contacted the builder.
He came and had a look at it. The wall that the roof joins to has some old pebble dash on it, that the previous occupants put on about 40 years ago. His first story was that the reason for the leak was that the pebbledash had failed. But I can't see why the pebbledash makes any difference if the flashing is properly bedded into the wall behind, between the bricks and mortared in (as my builder says is the case). Also I can't see why it would have been sound 2 years ago but deteriorated to the extent that it is causing a leak now.
I don't want to get into a technical argument about render and different types of flashing as I think it is not relevant - a new roof should last longer than two years, whatever it is made of. But am I missing something? And what needs to be done to make the flashing waterproof?
Here are some pictures:
This is a bit of the render that he says has deteriorated and caused the problem (it is like this in multiple places):
However, earlier this year, I was in the garage during a heavy rain storm and saw that there was water coming in in multiple places where the new garage roof meets the house wall. My first thought was that the flashing must have failed, so I contacted the builder.
He came and had a look at it. The wall that the roof joins to has some old pebble dash on it, that the previous occupants put on about 40 years ago. His first story was that the reason for the leak was that the pebbledash had failed. But I can't see why the pebbledash makes any difference if the flashing is properly bedded into the wall behind, between the bricks and mortared in (as my builder says is the case). Also I can't see why it would have been sound 2 years ago but deteriorated to the extent that it is causing a leak now.
I don't want to get into a technical argument about render and different types of flashing as I think it is not relevant - a new roof should last longer than two years, whatever it is made of. But am I missing something? And what needs to be done to make the flashing waterproof?
Here are some pictures:
This is a bit of the render that he says has deteriorated and caused the problem (it is like this in multiple places):
Last edited:
