Sewer Update:
When the plumber was here last week they had a much larger and powerful auger / snake and cleared some roots. I've washed laundry and done back to back showers and each time I check the cleanout and there's no standing water. Problem may have been the roots and not the belly.
Front Door Project:
The first thing I need to do is install a new 36" front door on this shop. As you can see from the pictures it has a steel framed commercial door. The door frame isn't even installed correctly. You can see the gap between the frame and cinderblocks on one side. No tie ins or mortar holding it. For some reason the frame has been cut and welded.
Unfortunately I've already ran in to problems.
The opening in the cinderblock wall is 40.25" x 87.25". With a little clean up with my grinder and diamond wheel it could be 40.50" wide.
If I add a 2x8 wood rough in (buck) it would leave me with a rough opening width of 37.25" (or 37.50" with some grinding).
Typical rough in openings I found are:
32 x 80 door (actual width 33.43) = 34" x 81.75"
34 x 80 door (actual width 35.50") = 36.25" x 82.125"
36 x 80 door (actual width 37.50") = 38" x 82.25"
I was looking at a 36 x 80 steel front door with an actual width of 37.43". It would barely fit the 37.50" buck rough opening with no room for shimming it.
If I sandwich a 1x8 between the cinderblock and 2x8 on one side it would give me a 36.50" width opening. A little big for a 34 x 80 door.
An extra 2x8 on one side would give me a 35.75" width opening. About .25 inches wider than the actual 34 x 80 prehung door. For some reason 34" doors are much more expensive than 32" or 36" doors.
An extra 2x8 on each side gives me a 34.25" opening which is. 75" larger than a 32 x 80 door. This would be the typical recommended rough in size.
So now I have to decide if I want to try and clean up the block to get a 37.50" buck and squeeze a 36 x 80 prehung door in there with an actual 37.50" width, or frame it down to 34.25" and mount a 32 x 80 door with an actual width of 33.50".
I should note that the original metal door frame would have been set in place level and square, and then the block was laid around it compared to wood frame construction that has a rough in and then a prehung door is shimmed square and level and then mounted.
I checked the block opening on my building and it's level.