Can You Pour a Concrete Patio Over Grass?

 

Short answer? You *can*—but you really shouldn’t.

Let’s talk about why it’s a bad move and what to do instead

You’ve got a patch of grass in the backyard. You're dreaming of a chill patio space to relax, grill, maybe add a firepit. Pouring concrete sounds quick—so can you just pour it right over the grass and call it a day?

It’s tempting. But here’s the honest truth: pouring concrete directly over grass is a shortcut that causes long-term problems.

🚧 Why It’s a Problem

Grass holds moisture. It decomposes. And when it’s trapped under a slab of concrete? That moisture creates air pockets, uneven curing, and eventually cracks in your patio. Your once-smooth slab might sink, shift, or even split within months.

Plus, the grass isn't a solid base. Even if the concrete sets, the underlying layer will be unstable—kind of like building a house on jelly. Not great.

🌿 So What Should You Do Instead?

You don’t need a fancy contractor for this part—but you do need to prep your base correctly. Here’s what we recommend:

• Step 1: Remove the grass (dig about 4–6 inches deep)

• Step 2: Compact the soil underneath using a tamper

• Step 3: Add a layer of gravel or crushed stone (2–4 inches)

• Step 4: Add a layer of sand if needed and compact again

• Step 5: Install a form (wood edges) and pour the concrete

Yes, it's more work. But the result is a long-lasting, crack-free patio that you’ll actually enjoy for years.

🛠️ DIY vs Pro: What’s Better?

Feeling handy? You can do it yourself if it’s a small patio and you’ve got time. But if you want that clean, pro-level finish—smooth, leveled, reinforced—bringing in experts is worth it.

At Xcelent Concrete, we help homeowners across Portland turn rough patches of grass into stunning concrete patios with proper prep and durable materials. We do it right the first time.

💡 Quick Pro Tips Before You Pour

• Call 811 before you dig – avoid utility line disasters

• Use rebar or mesh for reinforcement

• Check your slope – patios should slightly angle away from your home

• Plan your finish (broomed, stamped, or smooth?)

• Let it cure properly—don’t rush it

📍 Final Thoughts: Build It to Last

Pouring concrete over grass might sound like a fast fix—but it’s really a fast track to future problems. Invest a little time (or hire a pro) to prep the base right. You’ll get a better-looking patio that lasts way longer.

Want help planning your perfect patio in Portland or nearby? Let’s talk. We’ll walk you through it—no shortcuts, no stress.