How to Level a Hot Tub on Uneven Concrete? – Follow These 2 Simple Methods


how to level hot tub on uneven concrete floor

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Uneven concrete could be due to a poor construction or could be unleveled for the sake of drainage.

But for whatever reason, your hot tub requires a flat surface and that should be your main concern when leveling your hot tub on concrete surface.

Leveling a hot tub on uneven concrete requires a platform and a wooden shim or a plastic shim if the slope is about an inch lesser.

Steeper slopes will require more materials such as sands, hot tub pads, plastic tiles, concrete, etc.

You can use the following 2 methods if you want to level your hot tub on an uneven concrete surface.

Method 1: Using Shims

Practically by using heavy duty plastic shims, you should be able to solve the problem of uneven concrete if your hot is one inch or less out of level.

I highly recommend to make use of EZ Heavy Duty Plastic Shim for this method to be more effective.

First, you need to empty your hot tub by draining the water from your spa completely.

After that, place the shims at regular intervals across the lowest part of the tub to add support to the it.

Using shims is a simple and inexpensive way to get your hot tub balanced and leveled on an uneven concrete surface.

However, you should note that the hot tub manufacturer guidelines differ, and some brands don’t recommend to use these shims.

So, its better to make sure to check your hot tub manufacturer’s guidelines for the proper usage and not to void their rules and warranty.

Method 2: Building a Shim and Platform Yourself

In this method, you need to first move your hot tub aside and cut a board into pieces enough to go across the low ends of the tub.

You can use a pressure-treated 2×4 board and cut it into pieces shaped like a wedge.

In this process, try to make a thick side at one end and tapered to a thin edge at the other side.

Make sure, it is about one inch thick and six inches wide.

Place them every foot across the lower end of the hot tub base.

Then attach exterior plywood with a screw and return your hot tub.

I highly recommend to use any of the above mentioned method if you want to properly level your hot tub on an uneven concrete floor.

In this article ahead, I will provide you more information regarding careful leveling of a hot tub on uneven surfaces.

Do Hot Tubs Need to be Perfectly Leveled?

If you ask my opinion, then my straightforward answer to this question would be a “Yes”.

Maybe not perfectly down to the millimeter but to some extent, your hot tub needs to be leveled to a near perfect measurements.

Maybe considering the hot tub drainage, a slight slope of about ½ inch for every 8-inches of your hot length and width is helpful.

Your hot tub needs to be balanced wherever it’s been situated or installed.

If not properly leveled, the hot tub could get damaged and have some cracks.

Secondly, you don’t want to sit in a hot tub with the water half-filled on one side and over-the-top on the other side.

So next time you might need to consider and check the area you’ve chosen for your hot tub.

Your main concern should be to place your hot tub on a flat surface.

The surface on which your hot tub is installed must be a solid, uniform, and leveled surface for the best results.

What Happens if a Hot Tub is Not Leveled?

A hot tub can weigh some thousands of pounds once it has been filled with water and even more when it has bathers in it.

The hot tub frame and hot tub shell are made to hold the pressure of water and the people inside it.

It also helps in distributing the total weight of your hot tub evenly.  

If the hot tub is not perfectly leveled, over time any surface dips can cause stress to the hot tub acrylic shell and its cabinet.

Over a period, this excessive stress on the shell and frame can lead to hot tub cracks.

Also, if the hot tub isn’t leveled, the water in the hot tub won’t be at equal height.

You will see that the one side holds more water than the other side of the tub.

This imbalance doesn’t give you the comfort you want whenever you bather in the hot tub.

So, to get the hot tub water to be at an equal level and the weight evenly distributed; your hot tub and the platform need to be completely and perfectly leveled.

Hot tubs are not to be placed directly on the grass or a bare ground.

Build or use a solid and leveled foundation or platform for your hot tubs.

You can also use pavers on grass, or dig up and use gravel as the hot tub base support.

Wooden deck surfaces can also be used in this case.

But you need to make sure that you need to be certain that the deck is strong enough to hold the weight of your hot tub.

Recommended Articles for You:

Find the Best Types of Shims to Level Your Hot Tub

Here is How You can Level Your Hot Tub on a Sloped Concrete Ground

5 Steps to Properly Level Your Hot Tub on a Patio

Follow These 3 Steps to Properly Level Your Hot Tub on Any Surface

How Much of a Slope Can a Hot Tub Sit On?

Your hot will sit better if it doesn’t exceed more than ½ inches slope in 8 inches run or a maximum of ⅛ inches per foot.

However, the most important thing is having a slab flat enough to evenly support the bottom of your hot tub.

No matter what your hot tub sits on or is made up of, whether concrete, pressure-treated, synthetic lumber, or bricks, etc.; it should be at least of the same size as the hot tub.

A slight slope of ¾” per 10 feet wide would be just favorable for a cement pad to avoid water pooling up under the hot tub.

Bricks or patio blocks might require no slope since water can drain out in between the blocks or bricks.

The setting should be done on a 3″ base for either sand, gravel, or stone and must be under the entire hot tub.

How Do You Make a Level Pad for a Hot Tub?

A level pad for a hot tub will help provide support to your hot tub by keeping it off the ground and preventing damage to your hot tub.

Hot tub pads are easy and quick to create and most of them are less expensive in nature.

Leveled hot tub pad can be created with concrete, bricks, or pressure-treated or synthetic lumber.

Here are 2 basic methods to make a level pad for your hot tub.

Method 1: Using Concrete Pad

To make a leveled concrete pad for your tub, you’ll need a 2×4 wood frame larger than the size of your hot tub.

Dig at least a 6 inches hole for the concrete pad base.

To prevent the concrete from moving or cracking, add a layer of crushed stones and wire mesh.

After that, you should pour this mix in the concrete and level it properly.

Method 2: Using Wooden Deck

If you’re building a wooden deck, then the following parameters are necessary.

Step 1: Use 2″×10″ floor joists on 16″ centers

Step 2: Use a metal joist hanger for support

Step 3: Then all major joist, beam, and header connections should be bolted with carriage bolts or metal lag bolts.

Step 4: Cement a post that would hold up the deck. Usually, it is made of 4″ × 4″ treated lumber with 8″ space apart.

Step 5: To prevent sinking, cement it with a footing pad.

How Do You Build a Leveling Platform for a Hot Tub?

The first thing to do is to choose a location for the platform.

Once your location is finalized then follow these 2 steps to build the platform.

Step 1: Create Your Deck Layout

Map out 8×8 foot and dig down the ground past the sod.

After this, fill it up with gravel and level it.

Step 2: Build Your Platform

Create 9 stakes inside your 8′ square, then dig a 15″ ×15″ square hole, one foot deep inside each of the stakes.

Fill 2 inches of the holes with sand and level them.

Place footing and align it and then balance the block.

Tamp the dug-up soil into the holes around footings, compact till it’s firm enough.

To set the post, nail (2) 2″×6″ 8-foot boards together to create (3) beams.

Nail beam on each side then set the posts with the center post being the first.

You can read through this guide to learn more.


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