We recently purchased an old stone house in southeastern PA with a number of water intrusion issues. One of the worst we’re tackling is a concrete roof/terrace that was poured during (I think) the conversion of the basement to a garage. 

There’s a drain in the front corner of the terrace which should move water out and into the yard, but the grading on the concrete is such that water just pools and in some spots is actually directed back towards the house. The previous owner did their best to dam the door and seal the interface between the concrete and stone, but it’s not effective. There’s a steel I-beam in the garage which does most of the heavy lifting for the front wall of that half of the house. It’s badly rusted/rotted out due to water working it’s way back in between the concrete and stone. After it rains the beam is dripping wet. The concrete is also showing signs of cracking and efflorescence.

We’ve had roofing contractors, masons, concrete finishers & general contractors out to see the situation and nobody seems confident in a solution. I’m less interested in keeping the terrace as useable space and more concerned with preventing future water issues. If we could keep it open as a terrace that’s a bonus.

I’m curious if anyone has any ideas for how best to tackle this to stop any further water issues. Unfortunately the house needs a ton of work and demoing and rebuilding is not in the budget right now.

We have a similar issue with a concrete flat roof over the entry door but at least that is graded better and moving water towards the drain. Either way it should probably be addressed at the same time.

Thanks for any suggestions!