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Flat Roof Counter Flashing Leak
How would you repair this leaking counter flashing? 
The leak is showing around the perimeter of the roof(inside wall and ceiling) after extended periods of rain.
The roofing material is a granule surface modified bitumen approximately 3 years old.
Professional Roofing Contractor Comments
you could just fill in the empty spots (voids) with mortar but i would repoint that whole strip that the flashing is tucked into. grind it all out and fill it back in with fresh mortar. and i would grind around that corner but one brick above the flashing and put a lead flashing there. (it bends good around corners) but i dont like those round rivet looking bolts? i wouldn't want any penetration through flashing. that may make me put new flashing after i did all that grinding. Lowell Mass
| "but i dont like those round rivet looking bolts?" |
Expanding fasteners(lead heads). I don't like them either. They tend to blow out/crack the mortar joints or bricks their set into.
Dennis M. Crookshanks Northeast Ohio www.dmcroof.com
tinner666
Looks like 3/4" tucked in. If the majority of the parapet surfaces are leaking, I'd suspect the brick and mortar itself. I can't see the capstone.
Filling the void or completely re-mortaring the joint may not stop the leaking. This might be one that needs sealing with Siloxane, or a similar material.
Be easier if I could feel that mortar! www.albertsroofing.com
slate roofer
Dennis,I am sure you have a idea already of what you are going to do..Has it leaked recently or since the new roof was installed? I would Clean out the joint ,re-mortar or use Tremco dymonic and also seal the masonary with a good quality sealer --and if that did not stop the leaks,, go up 2 joints ,cut a new joint and install another copper flashing over existing flashing 2-3"s,still would seal the exposed masonary,.the mortar joints look greenish(algae type growth?) in the pics(except for the one at copper flashing) which would indicate to me they are absorbing moisture. Slateworks Roofing Evans City, PA www.slateworksroofing.com
IKOROOFER
Perhaps, if the parapet is covered with a concrete top, the water infiltration starts there and saturates the entire wall eventually showing up on the interior (as mentioned in the caption) after extended periods of rain. I have found this to be the case on brick chimneys occasionally on leak calls, and I would recommend a reputable mason for advice and repair.... Maybe even installing a cap metal over the concrete.
tumpline
From the second pic it looks like there isn't a return at the top, also looks like it's bend over 90 degrees, if the mortar is loose water will definitely get directed behind flashing.
Cheapest proper repair IMO is to install a new counterflashing over the existing flashing, cut a new reglet up into the next brick course,install new counterflashing so it covers the existing flashing by 1.5 inches.
Axiom
The counter flashing looks fine from the pictures, new mortar or urethane wouldn't hurt.
The blue stuff looks like copper sulfate, if I remember correctly copper in an alkaline environment exposed to iron will produce copper sulfate.
Find the source of the blue stuff and you will find the leak.
The green stuff looks like algae, the blue stuff should kill the green stuff.
I think the walls need to be sealed and the coping if it is masonry.
I like Remedial Roofah's solution.
Aqua Roofing
How long has it been leaking and what is the consistency of leaks along the 3 perimeters? Is it spotting or long lines?
The reason I ask is, more than likely the counter flashing is only 3 years old, but it may have been installed in the same mortar joint as the previous flashing... From my experience, Its hard for me to see the counter flashing leaking that much! But always learning something new...
Is this mod a SA or Torch Down? Texarkana, AR www.aquaroofing.net
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