How to Level Existing Deck Joists: Step-by-Step Guide

If your deck has seen better days, it’s not necessarily time for a complete overhaul. You can restore its stability and safety by leveling existing deck joists. This process involves raising and supporting the joists to create a flat, even surface. Here’s a step-by-step guide to help you achieve this, ensuring your deck remains a safe and enjoyable space.

Before you begin, gather your tools and materials. You’ll need a circular saw, a level, a tape measure, a drill, joist hangers, screws, and gravel or shims. Also, ensure you have a safe workspace by clearing the area and turning off any power sources nearby.

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Assessing the Damage

Start by inspecting your deck’s structure. Look for sagging, uneven, or rotting joists. These are the horizontal supports that run beneath your deck’s surface. If the joists are more than 2 inches out of level, it’s time to level them.

Measure the distance between the joists and the ground. This will help you determine how much you need to raise the joists to create a level surface. Also, check for any rotting or damaged joists that may need replacement.

Preparing to Level the Joists

Once you’ve assessed the damage, it’s time to prepare your workspace. Remove any debris from the area under the deck. This will make it easier to work and ensure your safety.

Next, calculate the amount of material you’ll need to level the joists. You’ll need enough gravel or shims to fill the gap between the ground and the joists. Also, ensure you have enough joist hangers and screws to secure the joists in their new position.

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Using Gravel to Level Joists

Gravel is a common material used to level deck joists. It’s inexpensive, easy to work with, and provides good drainage. To use gravel, first, lay down a layer of landscape fabric to prevent the gravel from washing away.

Next, spread the gravel evenly across the area under the deck. Use a rake to create a flat, level surface. Then, use a level to ensure the gravel is even. Finally, place the joists on top of the gravel, using joist hangers and screws to secure them in place.

Using Shims to Level Joists

Shims are another option for leveling deck joists. They are thin pieces of wood that can be used to fill small gaps. To use shims, first, measure the gap between the joist and the ground. Then, cut shims to fit this gap.

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Place the shims under the joist, using a level to ensure they are even. Once the joist is level, secure it in place with joist hangers and screws. Repeat this process for each joist until the entire deck is level.

Securing the Joists

Once the joists are level, it’s time to secure them in place. Joist hangers are designed to hold the joists firmly in position. They come in various sizes, so make sure you choose the right one for your joists.

Position the joist hanger under the joist, with the flanges on either side. Drill pilot holes through the hanger and into the joist. Then, use screws to secure the hanger in place. Repeat this process for each joist, ensuring they are all securely fastened.

Checking for Level

After securing the joists, it’s crucial to check that they are still level. Use a level to ensure each joist is even. If any joists have shifted, adjust them as necessary.

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Once you’re satisfied that the joists are level, you can replace the decking. Start by laying the first board along the outer edge of the deck. Use a level to ensure it’s even, then secure it in place with screws. Repeat this process for each board, ensuring they are evenly spaced and level.

Congratulations, you’ve successfully leveled your deck joists! With regular maintenance, your deck should remain safe and stable for years to come. Don’t forget to inspect your deck annually, looking for any signs of wear or damage. If you notice any issues, address them promptly to ensure the longevity and safety of your deck.

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