Originally Posted by
Noah DuMass
No one here has any experience with concrete and roots?
In my opinion, you already answered your own questions.
Originally Posted by
Noah DuMass
There are many vertical structural cracks in the cmu portion of the building (cmu on poured foundation / basement) which measure out to coincide with the interior point of "the mystery leak".
No excavation has been done and NONE of the interior leak points coincide with the visible vines (above ground).
Naturally the first question is, "can you see any roots or vines IN the basement or anywhere INSIDE the building." No, no sign of heaving, bulging and no penetrations of roots or vines whatsoever.
The roof had MAJOR leakage covering the entire building,
from my experience the sheeting of leakage on the interior walls (basement) and above ground first and second floors appears to be consistent with bad scuppers/roof drain inlet or leaking internal plumbing in the drain system.
Also during the extremely heavy rainfall events during which the "leak" presents itself the outlet of the roof drain system is underwater as the surface water runoff in the adjacent street exceeds the curb height (the outlet is below curb by ~1"-2") and flows over the city sidewalk.
All that would do is create water backing up toward the foundation wall, however, it would increase the moisture load on the foundation wall.
The structural cracks have no vine or root growth visible in them and despite cutting the vines to the ground (they have subsequently grown back to cover the side above ground) the vines have still not taken advantage of the cracks. Being heliotropic and opportunistic the vines appear to be growing up (toward the sun) and outward (away from the foundation) as I would expect since plants in a pot grow root out the hole, not through the clay wall of the pot following the path of least resistance.
So the meat of the question is; obviously anything is possible what is the best way to conclusively determine the true origin of the water intrusion?
Dye test? (at roof or ground level)
That is one way to try to determine what water source is a contributing factor. "A" "contributing" factor, there may well be more than one contributing factor from your information.
That would not tell you much, if anything, about the leak, the exterior side of the foundation wall should be waterproofed, and, if waterproofed, the strength of the concrete will not be a contributing factor.
Excavate the entire basement wall?
That would tell you if the foundation wall was properly waterproofed, and give you access to add additional water proofing and drainage systems.
That would certainly help.
Of course, you still have all that water leaking in from the roof leaks above.
This has been an ongoing problem for years
And the roof leaks have been going on for years too?
Crimeny, the owner should have repaired the roof leaks years ago, stopping the roof from leaking. That should have happened a long time ago, and, there is no reason for the owner not to do it now. For some things, late IS 'better late than never' - sooner would have been even better.
First, the roof leak should be addressed, WHETHER OR NOT that is a contributing factor to the leaks inside. WHY has that NOT ALREADY been done?
Second, forget the vines, you have drainage/waterproofing issues around the foundation if you have water sheeting down the interior of the foundation walls (which is what I am taking you as describing).
Third, forget the vines. Period. At worst, the vines have damaged the waterproofing coating applied to the exterior wall of the foundation/basement wall ... *IF* any waterproofing was applied.
Fourth, forget the vines. There needs to be a drainage system around the exterior perimeter of the foundation walls to drain away the water which is now being drained down and away from the waterproofing on the exterior perimeter of the foundation walls.
I would not bother with a dye test, tell the owner to repair the dang roof leaks.
Excavation around the foundation/basement wall, on the other hand, is most likely needed - to address the issues raised above.
