Parapet wall rain penetration?

[foxhole]

Is this likely, have a large flat roof [house extention]with epdm which runs up onto top of parapet wall both sides,but not right across top. House side runs up into existing roof [under tiles] and on the end into standard gutter.
During prolonged heavy rain get a small leak internally about a metre from one front corner and one rear corner[and diagonally opposite]. Could this be rain penetrating the top or sides of parapet wall? Wall is dashed to outer skin.
Prior to changing roof a couple of years ago there was evidence of similar leak in same areas [one reason for new roof covering] was prevoiously felted but no visible sign of any leak or damage to roof covering.

 

[^woody^]

Parapet are always a source of leaks. What is on top of the parapet?

 

[noseall]

Parapet are always a source of leaks.

Amen to that and yet architects still spec' them!

Why anybody would want a wall protruding through a perfectly good roof is beyond me.

 

[foxhole]

Parapet are always a source of leaks. What is on top of the parapet?

Just row of bricks on there side. Did find a dozen metre long cap stones in the garden when we purchased the house figured they had never got round to fitting.
Would capping the parapet improve/solve the problem?

 

[catlad]

Your other option is to ply line your parapet wall and edpm it the same as your roof.

 

[foxhole]

Your other option is to ply line your parapet wall and edpm it the same as your roof.

Would imagine that would look fairly ugly on out side and awkward as pebbel dashing is quite coarse, looks like 20mm pebble on top of original dashing, making for a lot of bulk.

 

[catlad]

I was only thinking roof side with some sort of cap on top/ outer wall to stop water getting behind pebble dash.

 

[foxhole]

Epdm runs up innner wall and onto brickwork with a metal angle cap on inner edge. Was thinking maybe cap with a pvc 225mm -250mm facis board leaving the overhang to form a drip. Could cover in one piece ensuring nothing gets thru top brickwork.?

 

[catlad]

Sounds like a plan, you could always stick the copping stone on top to make it look a bit more solid.

 

[foxhole]

Should be very little to see from ground level.

 

[^woody^]

If you have just a brick on edge with no tile crease or drip extending past the render, then that would be suspect.

There should also be a DPC under the wall coping

If the render and flashing is sound, then just correcting the above should be enough

 

[foxhole]

Unfortunately no sign of any DPC.

 

[cotswoldbuilders]

Lay dpc and coping stones over the brick wall,