In that instance, I was able to fit 8 ft lengths inside (2x4, PVC ...) and strap plywood/sheetrock to the roof.  

They have an excellent guest Mat Ishbia from UWM (United Wholesale Mortgage) who goes into great detail on this subject and provides amazing insight!

If you're cash strapped, one should start with condos if they want to get in the door and then SFH or Multis. 

Both ways are hard to pull off, but are worth it if your are strapped for cash.

Once done, I can back out the copper male adapter if it's not badly corroded and fused.Yes one of my fears is the connections are badly corroded which will mean replacing the fittings, and if i have a hubbed fittings with the bathroom double tapped tee on top with a street end into it, I have to mess with that it may turn ugly.Even worse if the pipe below that fitting has a vertical crack into the concrete slab.Or I can even tease out the copper pipe after having the two openings because it's strapped to the framing in between, or the holes are drilled so close a copper coupling cannot pass through.I may have to replace with same copper since PVC may be too large OD to fit through existing stud holes.

I showed the seller how much I was spending on the bigger warehouse next door and that I'd be strapped for cash for a while.

We have used tile (works best on a cement pad); an overlay decking that comes in squares like tile and rubber mats over painted deck.We inherited artificial turf ... didn't really care for it.  

Consider a new amenity for your rentals.......a backyard kennel, doggie playground, big bone door mats, doggies doors and walk in tubs with leash attachments!

Will put in grass erosion mats over the grass seed tomorrow. 

Your issue is that you don't have the time to commit to real estate and when people have money and are strapped on time, they tend to trust (or pay) others to do things for them and then never learn why or how and end up losing money or trusting people on a deal that they didn't have the time to fully vet or understand.