09/02/2026
If you live in a sandy rich soil environment.
Meaning. Good topsoil. That you CANT dig out.
Then yes. Lay down your underlayment.
But around here boys. We have clay. Slate. And limestone.
That’s why. You don’t see underlayment on my projects. It’s not “necessary”.
We dig out ALL topsoil. We strip the earth to an elevation it’s never been before.
And then pack in a minimum of 6inches clean 3/4.
We then COMPLETELY fill the void behind wall with more clean 3/4. Grid. And pipe.
(Also. Block is porous. Water seeps through everything)
Also. If grade behind wall is “correct” then water will be shedding away from the wall. Not towards it.
Water diversion plans are real.
And if you don’t know already.
I’m gonna tell you.
Water is your worst enemy.
Treat it accordingly.