Hi everyone,
We have spotted some damp spots in our bathroom. This is on a party wall with no pipe this side, so I figure this is penetrating damp downwards from the parapet above. And indeed, on inspection I can see some damage on the gutter valley and cracking mortar.
1. Please have a look at the valley, this is not lead valley but something like asphalt (?) that you can walk on. What should I use to patch it up, bituminous mastic?
2. The mortar cracks along the line where this valley meet the parapet wall. I can repoint it, but wonder if there is any treatment I can do to seal the porous structure inside (that allow rain water to seep downward)? I have heard a builder said chemical filler but not sure what type it is.
3. On the other side of the parapet wall I can see it has been repaired like this before (see photo Repair). Would that work and what sort of material is that?
Thanks for your help.
We have spotted some damp spots in our bathroom. This is on a party wall with no pipe this side, so I figure this is penetrating damp downwards from the parapet above. And indeed, on inspection I can see some damage on the gutter valley and cracking mortar.
1. Please have a look at the valley, this is not lead valley but something like asphalt (?) that you can walk on. What should I use to patch it up, bituminous mastic?
2. The mortar cracks along the line where this valley meet the parapet wall. I can repoint it, but wonder if there is any treatment I can do to seal the porous structure inside (that allow rain water to seep downward)? I have heard a builder said chemical filler but not sure what type it is.
3. On the other side of the parapet wall I can see it has been repaired like this before (see photo Repair). Would that work and what sort of material is that?
Thanks for your help.
