Composite decking is known for being low-maintenance and long-lasting, but it’s not immune to structural issues. Sagging or shifting can occur due to poor installation, foundation settling, or water damage. These problems not only affect your deck’s appearance but can also pose safety risks. In this post, we’ll explore why these issues happen, how composite deck contractors fix them, and what steps you can take to protect your investment.
What Causes a Composite Deck to Sag or Shift?
Composite decking materials are designed to be strong, but the overall deck system includes joists, beams, fasteners, and supports. If any of these fail, even the toughest decking can suffer.
Here are some common causes of sagging or shifting:
- Improper installation: If joists are spaced too far apart or aren’t level, the composite boards may begin to dip.
- Inadequate footings or support: Shifting soil or undersized footings can cause parts of the deck to settle unevenly.
- Water damage or erosion: Though composite materials resist rot, the supporting wood frame can still degrade due to poor drainage or excessive moisture.
- Thermal expansion and contraction: Composite materials expand and contract with temperature changes, which can affect alignment if not properly accounted for during installation.
Knowing the root cause is the first step to fixing the problem effectively.
How Professionals Restore Stability to Structural Deck Issues
When you call in experienced composite deck contractors, they follow a structured process to assess and fix sagging or shifting issues.
- Assessment and Inspection
Contractors start by examining your deck’s substructure, checking for:
- Uneven or cracked footings
- Rotted or bowed joists
- Loose fasteners or shifting beams
- Stabilizing the Deck
Temporary supports may be installed while repairs are planned, especially if there’s any danger of collapse. - Reinforcing or Replacing Materials
Depending on the damage, contractors may:
- Sister damaged joists with new lumber
- Replace footings or install helical piers
- Add blocking or bridging between joists for added support
- Leveling and Realigning Deck Boards
Once the structure is secure, the decking surface may be removed and reinstalled to ensure it sits evenly across the frame. - Finishing Touches
Fasteners, railing posts, and trim are all checked and tightened or replaced as needed to restore the deck’s stability and appearance.
Proper Deck Repairs Are Essential for Protecting Your Outdoor Investment
Benefits of Hiring Expert Contractors
Hiring expert composite deck contractors to repair structural issues provides a range of benefits:
- Improved safety: Sagging decks can pose trip hazards and structural risks.
- Extended lifespan: Reinforcing the structure helps your deck last longer with fewer issues.
- Preserved aesthetics: Realigned boards look cleaner and feel more stable.
- Increased home value: A well-maintained composite deck is a strong selling point for potential buyers.
- Peace of mind: Knowing your deck was evaluated and repaired by professionals lets you enjoy your space worry-free.
Even small shifts in your deck’s structure can signal larger issues. Acting early means avoiding extensive and expensive damage down the line
Red Flags to Watch For and Maintenance Best Practices
Keeping an eye on your deck can help you catch problems before they escalate. Here’s what to look for:
Warning Signs:
- Boards that bounce or feel spongy underfoot
- Visible sagging in certain sections
- Gaps growing between the deck and your house
- Railings becoming loose or leaning
- Water pooling near footings after rain
Preventive Tips:
- Schedule annual inspections by a licensed contractor
- Keep gutters and downspouts clear to avoid water pooling near your deck
- Maintain good airflow under the deck to prevent moisture buildup
- Avoid overloading the deck with heavy furniture or planters
Routine maintenance combined with timely repairs can keep your composite deck in top shape for years to come.
Busting Common Myths About Composite Deck Issues
Myth: Composite decks never need repairs.
Reality: While composite materials are low-maintenance, the underlying structure still requires attention, especially in changing climates.
Myth: A little sag is no big deal.
Reality: Even minor sagging can worsen quickly, affecting the deck’s integrity and safety.
Myth: DIY fixes are just as good.
Reality: Without the right tools or expertise, DIY repairs can lead to more harm than good—and may void warranties.
Working with professional composite deck contractors ensures repairs are done right the first time.
Contact Us Today!
If your composite deck is sagging or shifting, don’t wait until the problem gets worse. At Shly Deck & Fence, our experienced composite deck contractors are ready to inspect, diagnose, and repair your deck with expert care. We’ll help you restore your outdoor space to its full potential—safe, level, and built to last.
Call us today at (412) 515-6575 to schedule a consultation or deck inspection. Your deck deserves the best—let’s bring it back to life!
Frequently Asked Questions
Can a composite deck be lifted or re-leveled?
Yes, composite decks can often be leveled using jacks and additional support, depending on the issue’s cause.
Is it expensive to fix a sagging deck?
Costs vary based on the damage’s extent, but early repairs are almost always cheaper than waiting until more damage occurs.
How can I prevent my deck from shifting again?
Proper footings, regular maintenance, and professional installation are key to long-term stability.