As you can see, it is covered and over my garage. Although it is covered, it still gets rain and snow on it and, unfortunately, the top decking material is just painted OSB and it is seriously rotting. Under the OSB is good flat framing. I am going to rip out the OSB and I want to add a waterproof deck top, but understand that if I do that, I need to add slop.
My main question is this: how do I add slope to the existing frame? (I am assuming that there is none).
Some bonus questions:
- How would I check if there is slope already? It doesn't appear that there is slope to the eye. Would it show up on a long level?
- Any suggestions on waterproofing material?