Storage shelf above garage door
Hi there, I'm new to the forums here, hopefully someone can give me some advice or direction on where to go to get some advice. As I'm new here, I don't know who here is a professional and who isn't.
I'm in a Semi-detached home, my garage has a block wall on one side, and a framed wall on the opposite side. (just learnt thru research that cinder block and concrete blocks have different properties, not sure which I have, could you tell me how to determine which I have?)
What I'd like to do is build a shelf across that span(11ft). Roughly, the overall size would be about 11' x 13'. This will be for basic storage, kids toys, clothes, Christmas decorations, camping gear etc.
I am not sure what size of joists I should use, and spacing, and how best to attach them to each of the walls.
Should I put supports upwards to the floor joists above (our masterbedroom is above the garage)?
I assume 5/8 plywood for the floor would be sufficient.
My thoughts were to put a 2x?8? ledger lag bolted(a term I am not sure I fully understand) into the blocks on the one wall. And I have no idea how to attach the other end to the 2x4 studs.
Ultimately, my biggest concern is overall structural safety. I wouldn't want a future homeowner having it collapse.
I can post some pictures and more detailed dimensions if it would help.
Thanks for reading,