Can I Shim a Deck Post?

Ever found yourself with a wobbly deck, wondering if you can shim a deck post to stabilize it? You're not alone. Many homeowners face this dilemma, and the good news is, yes, you can shim a deck post. But before you grab your tools, let's dive into the details, safety considerations, and step-by-step processes to ensure you get it right.

Shimming a deck post involves filling the gap between the post and the hole it's set in, providing a solid base and preventing further movement. It's a common fix for settling foundations, improperly set posts, or posts that have shifted over time. But remember, this is a temporary solution. If your deck posts continue to move, it might be a sign of a more significant issue that requires professional attention.

Understanding Deck Posts and Shims

Deck posts are the vertical supports that bear the weight of your deck. They're typically made of pressure-treated lumber or composite materials. Shims, on the other hand, are thin wedges used to fill gaps and level surfaces. They're usually made of wood, but you can also find metal or plastic shims.

Shims come in various thicknesses, typically ranging from 1/32" to 1". For deck posts, you'll likely need shims that are at least 1/8" thick to provide adequate support. Always choose shims that are as wide as the post and long enough to span the gap completely.

When to Shim a Deck Post

Inspect your deck regularly to identify any signs of post movement. Common indicators include:

• Wobbling or swaying when you walk on the deck
• Gaps between the post and the beam or joist it supports
• Cracks in the post or surrounding structure

If you notice any of these signs, it's time to shim the post. However, if the post is severely rotted, damaged, or the movement is excessive, it's best to consult a professional before proceeding.

Tools and Materials Needed

Before you start, gather these tools and materials:

• Circular saw or handsaw
• Tape measure
• Level
• Hammer
• Shims (wood, metal, or plastic)
• Galvanized nails or screws
• Post-to-beam hardware (if needed)

Safety is paramount when working on your deck. Ensure the area is clear, and you have stable footing. Wear safety glasses and gloves, and always follow proper lifting techniques to avoid injury.

Shimming a Deck Post: Step-by-Step

Now that you've gathered your tools and materials, let's walk through the process of shimming a deck post.

First, measure the gap between the post and the beam or joist it supports. This will help you determine the size and number of shims needed. Cut the shims to match the width of the post using a circular saw or handsaw.

Shimming a Square Post

If your post is square, you can shim it from all four sides. Start by placing a shim on each side of the post, using a level to ensure they're flush with the top of the post.

Nail or screw the shims to the post, then attach the post to the beam or joist using post-to-beam hardware. Ensure the post is level and plumb before securing it in place. Add additional shims as needed to fill any remaining gaps.

Shimming a Round Post

Shimming a round post is slightly more complex. You'll need to create a square or rectangular shape to fit the shims. Start by measuring the diameter of the post and the gap on all sides.

Cut a piece of lumber to match the diameter of the post, then cut it into quarters to create four wedges. Nail or screw these wedges to the post, creating a square or rectangular shape. Place shims on all four sides of this new shape, following the same process as shimming a square post.

Maintaining Your Deck Posts

Shimming a deck post is a temporary fix, so it's essential to maintain your deck posts regularly to prevent further movement. Here are some tips:

Inspect your deck posts annually for signs of rotting, damage, or movement. Check the post-to-beam connections and ensure they're secure. Tighten any loose hardware and replace any damaged or rotted posts.

Preventing Post Movement

To prevent post movement, ensure your deck is properly designed and built. This includes using the correct size and type of posts, setting them in concrete footings, and providing adequate support with beams and joists. Also, maintain proper drainage around your deck to prevent water from eroding the soil around the posts.

Regular cleaning and sealing of your deck can also help prevent post movement. This protects the wood from moisture and UV damage, which can cause it to shrink, swell, or rot.

In the end, shimming a deck post can be a straightforward DIY project that helps stabilize your deck and prevent further damage. However, it's crucial to understand that this is a temporary solution. Regular maintenance and professional inspections can help ensure your deck remains safe and stable for years to come. So, the next time you notice a wobbly deck post, don't hesitate to grab your tools and get to work. Your deck will thank you!