This is a solid 6 inch concrete roof deck over an enclosed patio. Started in the Roofing and Siding Forum but it was recommended that I might want to stop by here and get your opinions on how to best approach repair from this point forward. Thanks in advance, your time is greatly appreciated!
This is as far as a 4000 psi pressure washer got me.
I'm only guessing on most of this but from top to bottom...
1) Some kind of water-proofing paint and/or membrane.
2) The big crack looks like it's been patched with a concrete or patching material.
3) The black stuff...I have no idea...some kind of sealer, primer or adhesive?
4) Then the six inch poured concrete block.
I still think would be to cover it with a vinyl deck membrane. The trick would be to make it smooth and take the adesive to stick it down. You may have to sandblast it before you patch the cracks. What ever you do, you want the new product to go up behind the siding for 6 inches.
I'm hopeful to get to the point where all I have left to do is cover/coat it & flash it. Right now, I'm concerned with how to get from this point to that point. The 4000 psi pressure washer would not take up anything else so I'm unsure what would be the next step with old patch & black stuff?
I don't know what climate zone you're in, but I'd be tempted to install some composite deck planks, directly onto the existing surface and oriented "downhill", using a compatible adhesive. Only doing so if the existing surface is sound and not likely to further deteriorate, of course.