Composite vs. Wood Decks: Which Is Best for Central Illinois?

The composite vs. wood question comes up in almost every deck consultation in Peoria. The right answer depends on your budget, how long you plan to stay in the house, and how much maintenance you are willing to do. Here is the real comparison for Central Illinois conditions.

What Central Illinois Weather Does to a Wood Deck

Peoria's climate creates a specific challenge for wood decking: repeated freeze-thaw cycling. Through a typical Peoria winter, temperatures swing above and below 32F dozens of times. Each cycle, moisture in the wood grain expands slightly as it freezes and contracts when it thaws. Over years, this creates checking (small surface cracks), cupping, and warping -- even in properly installed pressure-treated wood.

Add Peoria's summer UV exposure and hot-wet humidity cycles from June through August, and a wood deck faces mechanical stress from every direction. An unsealed or poorly maintained wood deck in Peoria looks worn within 3 years and structurally compromised within 10.

The Honest Maintenance Math

A pressure-treated deck should be cleaned and sealed every 2-3 years. A full re-stain is needed every 5-7 years. Over 25 years on a mid-size deck (16x20):

• Sealing every 3 years x 8 applications: $600-$1,200 each = $4,800-$9,600 total
• Full refinish every 7 years x 3 applications: $1,200-$2,200 each = $3,600-$6,600 total
• Board replacements over 25 years: $1,500-$4,000
• Total maintenance cost over 25 years: $10,000-$20,000+ on top of the initial build cost

A comparable composite deck costs roughly $10,000-$14,000 more upfront than PT wood on a 16x20. When you account for maintenance costs, composite typically reaches cost parity around year 10-12 and saves money over a 25-year ownership period.

Where Wood Wins

• Lowest upfront cost: If budget-constrained now and willing to maintain properly, PT wood is the right choice.
• Short-term ownership: If selling in 3-5 years, the composite premium will not pay back in resale value.
• Repairability: Individual PT boards are easier and cheaper to replace than composite with matching profile.

Where Composite Wins

• Long-term homeowners: If staying 10+ years, composite is likely cheaper on total cost of ownership.
• Low maintenance tolerance: Composite requires only occasional cleaning. No staining, sealing, or refinishing.
• Freeze-thaw performance: Capped composite is more dimensionally stable through Peoria winters.
• Appearance consistency: Composite holds color and texture far better over a decade of Central Illinois weather.

The short version: for most Peoria homeowners planning to stay in their home and wanting a deck that holds up with minimal work, composite wins on a 10-year horizon. For homeowners optimizing for lowest upfront cost or selling within 5 years, PT wood with a real maintenance commitment is a reasonable choice.