8 Signs You Need To Replace Your Deck

A deck is an important part of any home, creating additional outdoor living space for entertaining, resting, and spending time together. However, decks need constant maintenance and eventual replacement as they age and deteriorate from constant exposure to the elements.

Knowing when it’s time to replace your deck is crucial for homeowners in order to avoid more costly repairs down the road and ensure the safety of your family and guests. This comprehensive article will outline eight telltale signs that your wooden or composite deck may be due for replacement.

1. Uneven Deck Surface

Pay close attention to how the deck feels under your feet as you walk across it, especially near the outside edges. Soft, spongy areas that sag under your weight indicate underlying structural issues starting to develop beneath the deck boards. A visibly uneven surface means the underlying structure is starting to weaken or fail, requiring full replacement before possible collapse.

Also, note any areas on the deck surface that are uneven side-to-side when looking down the length of the deck. This can indicate improper installation of the joist support system or post footings beginning to shift or sink on one side. A deck surface that is no longer level poses a tripping hazard.

2. Wobbly Handrails or Balusters

Loose, shaky, detached, or moving handrails and balusters present a major safety hazard on an elevated deck. Proper installation of deck railings uses sturdy metal fasteners like lag screws and bolts to keep all posts, rails, and balusters firmly secured in place, even under applied weight or force. Any noticeable wobbling, shaking, or movement indicates that the fasteners have come loose from the internal wood or pulled away entirely in some spots.

To address such issues efficiently, it’s advisable to search the internet for find decking contractor online to find a company with expertise and experience in handling deck repairs and replacement. This not only ensures quality work but also saves time in trying to fix it yourself. Loose deck railings should be promptly repaired as soon as movement is noticed or replaced completely if the issue is widespread. Otherwise, the chance of rails giving way increases, which can lead to serious injuries from falling off the deck. 

3. Leaking Flashing around the Ledger Board

The ledger board anchors the deck structure securely to your home. During initial deck construction, proper flashing installation is vital to prevent moisture from entering the space where the ledger board meets the exterior wall. Over time, inadequate or missing flashing can allow rain and moisture penetration into the ledger board-to-wall connection and even into your home’s wall structure. If you’re unsure about the quality or state of your ledger board flashing, it might be time to find a decking contractor online to ensure the utmost safety and durability.

Inspect the ledger board attachment area carefully for any signs of moisture leaking, water damage on materials, mold/mildew growth, or rusting fasteners. All these signs point to failed or insufficient flashing that requires full deck demolition and rebuilding to correctly replace the flashing. Leaking can cause structural damage as moisture causes the ledger board attachment and wall structure to rot.

4. Extensive Pest Damage

Several types of wood-boring pests, like carpenter ants, termites, and powderpost beetles, can cause major structural damage to decks over time. Look closely for small bore holes, hollow-sounding wood when tapped, or accumulations of fine wood dust called frass around joints between boards or at support posts. Use an awl to poke at decking and railings to check for hollowed-out tunnels within the wood.

Once pests have infested and compromised the integrity of decking boards and/or structural supports, the damaged components must be replaced and preventative treatment applied during reconstruction. This avoids recurrent future infestation. Catching and treating pest damage early is best to limit required repairs.

5. Outdated or Unsafe Railing Height

Building codes require deck railings to meet a minimum height standard, typically 36-42 inches high, depending on local regulations, with baluster spacing no greater than 4 inches apart. This helps prevent falls between balusters or over the railing. Decks built more than several years ago often fail to meet current safety standards for railing height and baluster spacing, posing a potential falling hazard.

Railings lower than 36 inches or with baluster spacing wider than 4 inches are especially unsafe for small children. Replacement provides an opportunity to update and meet the current code for safety. Include inspection of railing height and baluster spacing in your regular deck inspection checklist.

6. Deteriorated Concrete Footings

The concrete footings installed below the surface at each post support the weight of the entire deck structure above. Cracked, crumbling, or sinking concrete footings indicate a failure starting underneath the posts. Signs of deteriorated footings include tilting posts, bouncing or sagging deck boards, and separation between the deck and house structure.

Damaged footings underneath the deck cannot properly stabilize and support the deck. Any signs of footing deterioration necessitate a complete tear-out and rebuild of the deck structure. Addressing footing issues at the first signs prevents more severe failures down the road.

7. Improper Joist Installation or Sizing

If you notice weak, sagging, or bouncing deck boards, the underlying cause may be improper joist installation or incorrect joist sizing. Signs of improper installation include uneven joist spacing, inadequate connections between joists and support beams, or lack of proper joist hangers. Using undersized joists during construction can also cause sagging or bouncing, even if installed correctly.

In either case, the only remedy is to completely rebuild the deck with properly sized joists and correct installation that meets code requirements. This ensures the new deck provides a solid, stable walking surface.

8. Outdated Decking Material

Over years of use, wooden decking boards will show significant weathering, splintering, warping, and deterioration. Older composite decking materials often fade, stain, and degrade in harsh weather. If your existing decking is in poor condition, replacement provides an opportunity to upgrade to newer, better decking options.

Modern wood-alternative composites offer great looks with less maintenance needs. New pressure-treated woods have superior protection from insects, decay, mold, and UV damage. Replacing worn-out decking allows you to get a completely new surface that looks fantastic and will last.


Replacing a deteriorating deck is a significant investment, but the benefits for your home’s safety, functionality, and aesthetics make it worthwhile. If your deck shows multiple signs of aging, decay, or danger, replacement should strongly be considered. Addressing issues proactively can prevent more costly emergency repairs down the road. 

With proper maintenance, a new deck will provide an enjoyable outdoor living space and enhance your home’s value for many years. Consulting with a deck-building professional is wise to assess your needs and design the ideal new deck tailored to your home and lifestyle.