7 mistakes that make a new deck fall apart

Building a deck is a big investment, and the last thing you want is for it to fail before its time. Unfortunately, even new decks can start showing problems fast if common mistakes are made during installation or upkeep. If you want your deck to last, avoid these errors that cut its lifespan short.

Skipping Proper Footings

Decks need a solid foundation. Cutting corners on footings or setting posts directly on the ground makes them shift, sink, or rot.

Concrete footings keep posts stable and dry. Without them, the deck structure weakens quickly, no matter how good the lumber is.

Using Untreated Lumber

Not all wood is created equal. Using untreated or low-grade lumber for framing and posts leads to rot and insect damage within a few years.

Pressure-treated wood or composite materials extend the life of the deck. Choosing cheaper options upfront is a costly mistake later.

Improper Fasteners

Deck screws and joist hangers need to be corrosion-resistant. Using indoor nails or non-galvanized hardware weakens connections over time.

As fasteners rust or pull out, boards loosen and the whole deck loses strength. Quality hardware is non-negotiable.

Poor Ventilation Underneath

Moisture trapped under a deck accelerates rot. Without enough clearance or airflow, boards stay damp and decay faster.

Ensuring space underneath and keeping vegetation trimmed back allows air to circulate and wood to stay dry.

Skipping Sealant or Stain

Bare wood weathers quickly under sun and rain. Skipping sealant or stain makes a deck gray and brittle within a couple of seasons.

Sealing wood every few years protects it from UV damage and moisture, helping it last much longer.

Incorrect Spacing Between Boards

Boards set too close trap water and debris, while boards spaced too far create safety hazards. Both mistakes shorten the life of the deck.

Proper spacing allows drainage while keeping the surface safe and durable. It’s a small detail with a big impact.

Ignoring Regular Maintenance

Even new decks need attention. Failing to sweep, wash, and check for loose boards or nails lets problems build.

Consistent maintenance prevents small issues from turning into major repairs. A deck only lasts if you keep up with it.

*This article was developed with AI-powered tools and has been carefully reviewed by our editors.