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How to Level Garage Floor Slope with Perfect Angle?

It’s a hassle to level your garage slope according to the right angle. Because one mistake will make you start all over again. Without perfect leveling and slope calculating the whole garage will turn into a mess. That’s even worse.

Now you might be thinking how to level garage floor slope while maintaining the right angle?

First you have to place the string level and fix the string by stretching it. Then using a protractor and a plumb identify the perfect slope. Now, mark it and set the leveling rails on top of the marks. Double seal the rails to ground and pour concrete over it. Once dry, you’ll have the perfect slope.

In this article, we’ve dived deep into the whole process of finding, fixing and leveling the ideal garage slope for your ease. Just scroll down and be good to go!

Why Are Garage Floors Sloped?

Well, if you have this mindset that garage floors are the same as the floors inside your home, then this thought is sort of misleading buddy. Because garage floors need to be paid more attention.

If you’re in a mood to ignore this fact then here’s what will happen in no time. First the garage will be filthy and sobby with water staying inside of it. And the stagnant water will bring mosquitos and bugs to your doorway. Sounds unhygienic right?

To add with it, if you’ve got a geothermal loop then the situation is even worse because it will put pressure on the system.

But we’ve got your back with the in-depth guide on finding the ideal garage slope and levelling it with perfection.

How to Find the Perfect Garage Slope Angle?

Well finding the slope angle is not rocket science but without prior knowledge, it’s a hard nut to crack. Especially if you’re a perfectionist then you might want to put all your attention here. Because we’re here to guide you through on finding the perfect slope. To find the perfect slope you’ll need:

Now that you’re equipped with the tools, let’s dive in how to use them!

  1. Put your string line level to a far point from the garage door and attach one end of it to the wall.
  2. Pull out strings to an amount that can be reached to the edge of the garage door.
  3. Attach the level with the string and pull it hard enough until it looks like a piano string.
  4. Adjust the string by pulling it up and down until the bubble on the string level is in the middle of two lines.
  5. Place the protractor’s flat side against the floor of the garage while the center point is over the entrance edge.
  6. Place the plumb bob by holding the open end next to the level.
  7. Adjust the plumb bob until it stays still by the center point of the protractor.
  8. Look for the cross that the plumb bob makes above the protractor.
  9. Mark the crossing points with a marker to find the perfect slope.

Voila! You have been successful in  finding the perfect garage floor slope.

Quick Tip

If you’ve already got floor slope on the garage but the angle is not perfect. To fix garage floor slope, you can just mark the low and high points and level afterwards.

To find the perfect slope ratio you can rely on the ¼ inch per foot leading to the garage door. Which means the higher points inside leading to lower points towards the door. When you’re working on a ground of 26 feet or more deep then the amount may vary. So while marking the points be sure to measure them.

So that your garage doesn’t look like the streets of San Francisco, you know what I mean right?

Well, if you don’t want that, you will have to look into the steps for leveling the perfect garage slope.

How to Level Garage Floor Slope?

Now that you know what the angle is for your garage slope now it’s time to start leveling it. For that you’ll need some tools handy:

It’s time for some hard work, pal. Whether you’re down for leveling ground for an easy set pool or garage slope, it is indeed a tough job. So put your working gloves on and follow the given steps-

Step 1 of 4: Mark Low and High Points

First things first, grab your pencil or any other marker to point out the low and high points. These points are to be marked over the previous marks to make it more visible.

Step 2 of 4: Set the Leveling Rails

Now it’s time to put adhesive on the floor to make sure the 2*4s stick to the ground. While it’s setting, do cross check with your slope angle. After placing the leveling rails properly to set, it’s time to wait.

Leave it for 10 minutes to set. Now nail them to the ground. This is what we call “double check to ensure”.

Step 3 of 4: Pour Concrete to Level it

Well, time for the main task. Pour your concrete mixture in between the 2*4s. Then just scroll your leveling compound above the 2*4s to move excess concrete mixture away. Let it sit for 2-7 days.

You can also use self leveling concrete instead of regular concrete mixture to fasten the procedure.

Step 4 of 4: Let it Dry

It’s time to check if the concrete has dried properly or not. If yes then just put any high pigmented white paint over the concrete. And you’re done.


Question: What is the standard slope for a garage?
Answer: The garage slope standard is ¼ inch per foot. But still it’s important to cross check with your building instructor for assurance.

Question: Is it okay to have a plain garage?
Answer: No it’s not. Because a plain garage won’t give you the opportunity to drive away water. The water drainage system will be hampered.

Question: Can I pour concrete to the slope?
Answer: Yes, basically that’s the whole point of making a slope. After marking the places, you need to pour concrete to level it.

End Note

That’s all from us for now. By now you’ve become an expert on finding and leveling the garage floor slope.

So put that knowledge to work. And let us know in the comments if you face any difficulties.

Good luck!