Just added plastic risers to mine a few months ago. The septic tank/pumping company recommended a butyl rope to seal the new riser to the old tank. Put the butyl down, set the riser on, and give it some nice, even pressure and then you're good to backfill.
This is looking fantastic. I love to see an old barn, especially a local one, being brought back to life.
I had an Amish crew do the same thing (on a much smaller scale) on my old shop in 2024.
Mike, I am surprised that you do not have a pneumatic Riv-Nut gun considering your love for air tools. We use them all over at work and a few Riv-Stud guns as well.
I personally like the Busch apple as far as the flavored Lattes go. We got apple in Ohio around beginning of May. We just got the newly released lime and it's probably my least favorite. Had peach last year as well and rumor is it will be back in July/August time frame.