Couldn’t agree more—site prep is where the headaches start or end. I’ve watched folks try to “fix” a soggy mess with thicker plastic or expensive underlayment, but if the dirt’s not sloped right, you’re just fighting physics. Here’s how I usually approach it:
First, I make sure the subgrade is sloped at least 5% away from the slab area. That’s about 6 inches drop over 10 feet—nothing fancy, just a long level and a string line. Next, I compact the soil with a plate compactor, especially if it’s been disturbed. Skipping that step is asking for cracks later.
For drainage, I always run a perimeter French drain if there’s any doubt about water movement. It’s not glamorous work, but it beats dealing with a wet crawlspace down the line.
Curing-wise, I’ve done both the old-school wet burlap and the commercial sprays. Honestly, keeping it damp with plastic sheeting and a hose works just as well for most jobs, unless you’re in crazy hot weather.
One thing I’ll push back on—sometimes folks overdo the gravel base. Too much and you can actually create channels for water to move under the slab, especially if your site’s not graded right. Just enough for drainage is all you need.
Couldn’t agree more about the site prep headaches. You nailed it with,
I learned that the hard way on my first pour—spent way too much time trying to “fix” water issues after the fact. The French drain tip is gold, too. I used to think more gravel was always better, but you’re spot on—too much and you end up with a moat under your slab. It’s all about balance, isn’t it?“if the dirt’s not sloped right, you’re just fighting physics.”
Couldn’t agree more about the site prep headaches. You nailed it with, I learned that the hard way on my first pour—spent way too much time trying to “fix” water issues after the fact.
Totally get what you mean about “fighting physics.” Been there, done that—nothing like chasing puddles after a rain to make you rethink your prep. It’s wild how a little too much gravel can turn into a headache. You nailed it: balance is everything.
MY ADVENTURE WITH DIY CONCRETE FOUNDATIONS
You know, I always thought more gravel meant better drainage—turns out, it just means more places for water to hide and mess with your forms. My first slab looked like a mini swimming pool after a storm. Now I’m all about that gentle slope away from the site and checking the weather twice before I even touch a shovel. It’s funny how the “simple” stuff bites you if you skip steps.
MY ADVENTURE WITH DIY CONCRETE FOUNDATIONS
Funny how the “obvious” stuff ends up being the hardest to get right. I’ve been there—thought I could outsmart water with extra gravel, too. Turns out, water’s got a mind of its own. You learn quick after that first puddle. Good on you for sticking with it.
