Broken sections of upstand on flat roof - how to mend?

[MattB83]

I hope the following makes sense - I have an old felted flat roof that leaked for a while and I achieved a reasonable fix with some bitumen mastic and painting the whole thing with some blackjack roof repair (the 50L tin) it's leaking again and I suspect it's the following in a few places. There isn't any lead flashing, but rather the more cheaply done tuck it into the wall and slap a lot of cement over the top - in some places, the felt has clearly torn - it looks like in one place (perhaps previous same issue) they've put a big wad of bitumen mastic over as a patch and it looks like it's made a good seal - is this the best approach? Probably time for a new roof but hoping this could last another winter...

EDIT - I've misused the term 'upstand' - apologies - it's just the vertical piece of felt that tucks into the wall.

 

[blup]

Patching with felt (including mortaring it into the wall) has got to be the best approach and cheaper than re felting the roof.

Blup

 

[noseall]

I hope the following makes sense - I have an old felted flat roof that leaked for a while and I achieved a reasonable fix with some bitumen mastic and painting the whole thing with some blackjack roof repair (the 50L tin) it's leaking again and I suspect it's the following in a few places. There isn't any lead flashing, but rather the more cheaply done tuck it into the wall and slap a lot of cement over the top - in some places, the felt has clearly torn - it looks like in one place (perhaps previous same issue) they've put a big wad of bitumen mastic over as a patch and it looks like it's made a good seal - is this the best approach? Probably time for a new roof but hoping this could last another winter...

EDIT - I've misused the term 'upstand' - apologies - it's just the vertical piece of felt that tucks into the wall.


View attachment 314723

Fix a lead cover flashing at or above the chase.