How to Fix out Of Square Deck

Decks can be a great addition to any home, providing a perfect outdoor space to relax and entertain. However, over time, factors such as weather or improper installation can lead to an out-of-square deck. 

How to Fix out Of Square Deck

This affects the appearance of your deck and can also be a safety hazard. Luckily, fixing an out-of-square deck is not as complicated as it may seem. In this blog post, we’ll guide you through the process of how to fix out of square deck so that you can enjoy your outdoor space with ease.

Can You Fix It out Of the Square Deck?

Picture this – a beautiful summer day, you’re out on your deck enjoying the sun and some much-needed relaxation. Suddenly, you notice a board that’s popped out of place and is sticking up awkwardly. Not only is it an eyesore, but it’s a tripping hazard waiting to happen. 

The answer is yes, you can! While it may seem daunting, fixing a popped board on your square deck is quite simple. With a few basic tools and some elbow grease, your deck can be back to looking as good as new in no time. Don’t let a small problem ruin your outdoor oasis – take action and fix that board.

Fixing a Popped Board on Your Square Deck

Why Should You Fix out Of the Square Deck?

If you’re tired of your old wooden deck that’s no longer straight or level, then it’s time to fix it “out of square.” This will save you from constantly tripping over uneven boards and make your outdoor space look brand new again. Not only will this improvement improve the safety of your deck, but it will also enhance its overall aesthetics. 

An out-of-square deck can also cause damage to the supporting structure or the house’s siding. Fixing it promptly can help prevent more significant issues later on. So, whether you’re planning on hosting a barbecue for friends and family or just relaxing with a good book outside, you won’t regret taking the time to fix out of the square deck.

How to Fix out Of Square Deck – in 7 Easy Steps

Step 1. Diagnose the Problem

The first step in fixing an out of square deck is to identify the problem. Start by measuring the diagonals of your deck both ways, from corner to corner. If the measurements differ, your deck is not square. Then, check the support posts and beams to ensure they are level and straight. If they are not, that could be the cause of the issue.

Step 2. Adjust the Support Posts

If the support posts are not level, adjust them by digging around the post or adding shims until they are. Be sure to check your work by measuring the diagonals again. If the support beams are sagging, add additional support, such as jack posts, or replace the damaged beams.

Step 3. Realign the Joists and Deck Boards

Once the support structure is level and straight, it’s time to focus on the deck boards. Straighten any twisted or bowed deck boards with a crowbar, and re-nail them or replace any damaged boards. Next, check that the joists underneath the boards are level with the support beams and re-nail or replace them as necessary.

Deck Boards With a Crowbar

Step 4. Add Bracing

If you have a larger deck or are experiencing excessive movement, consider adding additional bracing between the support posts and beams. You can also install diagonal bracing between the beams for added stability.

Step 5: Trim Uneven Boards

If any of your deck boards are not level, you can trim them with a circular saw to make them even. Be sure to measure and mark the board before cutting, leaving a 1/4-inch gap between the boards for expansion.

Step 6: Check for Movement

Once all boards are cut, and the joists are straightened, check for any movement by pressing each board down to ensure it is level. If there is still excessive movement in the deck boards, consider adding additional bracing or replacing damaged beams and joists.

Step 7: Seal and Stain

Once your deck is square and level, you can seal it with a waterproof sealant and stain it to protect it from the elements. Be sure to use high-quality materials for the best results.

With these seven steps, you can fix an out of square deck quickly and easily. By following these tips, you’ll be able to enjoy your outdoor space without worry. Good luck!

5 Considerations Things When You Need to Fix out Of Square Deck

  1. The first thing you need to do when trying to fix an out-of-square deck is measure the deck. You’ll need to measure the length and width of the deck, as well as the height of the deck. Once you have these measurements, you’ll be able to determine how much work you’ll need to do to fix the problem.
  2. The next thing you need to do is identify the problem’s cause. A few things can cause a deck to become out of the square, such as settling, warping, or improper installation. Once you know what’s causing the problem, you’ll be able to address it better.
  3. The third thing you need to do is ensure that all the lumber on the deck is level. This includes both the joists and the decking boards. If any of the lumber is not level, it will need to be replaced or shimmed in order to level it out.
  4. The fourth thing you need to do is ensure that all the fasteners on the deck are tight. This includes both nails and screws. If any of the fasteners are loose, they will need to be tightened in order to prevent further movement of the lumber.
  5. The fifth and final thing you need to do is to check for any damage that may have occurred as a result of the out-of-square condition. This includes checking for cracks, splits, or other damage that may have occurred due to the movement of the lumber. If any damage is found, it will need to be repaired before the deck can be used again.
Includes Checking for Cracks

5 Benefits of Fixing out Of Square Deck

1.  A More Aesthetically Pleasing Look

If your deck is out of square, it will likely have an unsightly appearance. This is because the boards will not be evenly spaced, and the corners will not be 90 degrees. A deck that is out of square can also make your home look unkempt.

2. Reduced Chance of Injury

An out-of-square deck is also more likely to be unstable, which can increase the risk of injury. This is especially true if the deck is on a second or higher story. If someone were to fall off the deck, they could seriously injure themselves.

3. Increased Longevity

A well-built, square deck will last longer than one out of square. This is because the weight of the deck will be evenly distributed, which puts less stress on the frame. Additionally, the fasteners will be less likely to loosen over time if the deck is square.

4. Easier to build

Building a square deck is also easier than building one that is out of square. This is because all of the boards and joists will be evenly spaced, and you won’t have to worry about cutting them to fit. Additionally, it will be easier to install the decking material if the frame is square.

Easier to Install the Decking Material

5. Fewer Problems Overall

Generally speaking, a square deck will have fewer problems than an out-of-square deck. This includes everything from stability issues to cosmetic concerns. If you want a great and functional deck, it’s best to build a square one.

Fixing out of square decks can be tricky, but with the right tools and knowledge, it’s possible to make your deck look great and perform better. With these five considerations in mind, you’ll be able to fix any deck quickly and easily.

Some Common Mistakes People Make When Trying to Fix out Of Square Deck

Trying to fix an out of square deck can be frustrating, but unfortunately, some people make it even more difficult by making common mistakes. One of these mistakes is not properly measuring the dimensions of the deck before attempting to make any fixes. Adjustments could be made in the wrong place without accurate measurements, leading to even more issues. 

Another mistake is not properly fastening the beams and joists. If these foundational elements are not secured properly, the deck can shift and become even more out of square. 

Lastly, not considering the weight distribution on the deck can also lead to problems. Too much weight in one area can cause the deck to bow and become uneven, creating the need for further repairs. By avoiding these common mistakes, you can work towards fixing your out of square deck with efficiency and accuracy.


A deck that is out of square not only looks unsightly, but it can also be unsafe. By following these simple steps, you can fix your out-of-square deck and restore it to its former glory. 

Always check the support structure, straighten the deck boards and joists, add bracing if necessary, and redo the finish for the perfect outdoor space. With a little effort, your deck will return to being a safe and enjoyable place in no time. Thanks for reading our post about how to fix out of square deck.

Photo of author

Adrian Green

Adrian has been interested in woodworking since he was a child. His father had a woodworking shop, and Adrian would help him out and learn from him. He gained basic carpentry knowledge as well as an understanding of how to work hard and take care of business. He enjoys woodworking as a hobby. He loves the feeling of creating something with his own hands, and the satisfaction that comes from seeing his finished products used by others. So he started this blog to spread his passion and knowledge to those interested in DIY wood-working projects. He knows that with a little guidance and practice, anyone can create beautiful pieces of furniture or décor from scratch.

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