my deck is sinking

"Revive Your Space: Expert Tips to Fix a Sinking Deck"

By Brian Johnson
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My Deck is Sinking: Causes, Solutions, and Prevention

If you've noticed that your deck is sinking or has become uneven, you're not alone. This common issue can be caused by a variety of factors and, if left untreated, can lead to serious safety hazards. In this article, we'll delve into the reasons behind a sinking deck, provide practical solutions, and offer tips on how to prevent this problem in the future.

Understanding Why Decks Sink

Decks can sink due to several reasons, with the most common being improper preparation of the site, inadequate support, and the natural settling of the soil. Other factors include excessive moisture, inadequate drainage, and the use of poor-quality materials.

Improper Site Preparation

One of the primary reasons decks sink is due to inadequate site preparation. This includes not removing enough soil, not compacting the soil properly, or not providing a solid base for the deck to rest on. When the soil beneath the deck isn't stable, it can compress over time, causing the deck to sink.

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Inadequate Support

Another common cause of sinking decks is inadequate support. This can happen when the deck's footings aren't deep enough, or when they're not spaced properly. If the footings aren't deep enough, they can't provide the necessary support, and the deck will eventually sink. Similarly, if the footings aren't spaced properly, the weight of the deck isn't distributed evenly, which can also lead to sinking.

Soil Settling and Other Factors

Even with proper site preparation and adequate support, decks can still sink due to natural soil settling. This is a slow process that can take years, but it can eventually cause the deck to become uneven or sink. Excessive moisture and inadequate drainage can also contribute to soil settling, as can the use of poor-quality materials that can't withstand the elements.

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Signs of a Sinking Deck

Before we dive into solutions, it's important to know the signs of a sinking deck. These include:

  • Uneven or sloping deck surface
  • Gaps between the deck and the house
  • Doors or windows that stick or won't close properly
  • Sagging or warped deck boards
  • Cracked or broken railings

Solutions for a Sinking Deck

If you've noticed any of the signs of a sinking deck, it's important to address the issue as soon as possible. The solution will depend on the cause of the sinking, but here are some common remedies:

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Re-leveling the Deck

If the deck has only sunk a little, it may be possible to re-level it by adding shims or adjusting the footings. This involves lifting the sinking side of the deck and adding support to level it out. However, this is a temporary fix and won't address the underlying cause of the sinking.

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Repairing or Replacing Footings

If the footings are the cause of the sinking, they may need to be repaired or replaced. This involves digging down to the footings, removing any damaged material, and replacing it with new, properly compacted soil or gravel. In some cases, the footings may need to be extended deeper into the ground.

Installing a New Base

If the soil beneath the deck is unstable or has settled significantly, it may be necessary to install a new base. This involves removing the existing soil and replacing it with a stable material, such as gravel or crushed stone. The new base should be properly compacted and sloped to ensure adequate drainage.

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Preventing Deck Sinking in the Future

Preventing deck sinking in the future involves proper planning, preparation, and maintenance. Here are some tips to help you keep your deck stable and level:

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  • Proper site preparation, including removing enough soil, compacting it properly, and providing a solid base for the deck
  • Using adequate support, including properly spaced and deep footings
  • Ensuring proper drainage to prevent excessive moisture and soil erosion
  • Using high-quality materials that can withstand the elements
  • Regularly inspecting the deck for signs of sinking or other issues, and addressing them promptly

When to Call a Professional

While some deck repairs can be done by the homeowner, there are times when it's best to call a professional. If the deck has sunk significantly, or if the cause of the sinking is unclear, it's a good idea to consult with a deck contractor or structural engineer. They can assess the damage, determine the cause, and recommend the appropriate solution.

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