ProWood® Critical Structure pressure-treated lumber is specifically engineered for load-bearing, permanent, and high-exposure environments. It has a heavier treatment level than Ground Contact and is approved for saltwater splash zones, offering our highest level of protection for structural integrity.

When a project demands strength, code compliance, and long-term reliability, Critical Structure lumber is the go-to solution. Its elevated treatment standards make it ideal for applications where failure is not an option.

Backed by the ProWood Lifetime Limited Warranty, it’s trusted by professionals for building with confidence under the harshest conditions.

Where to Use Critical Structure Lumber

Critical Structure is ideal for applications that:

• Support significant structural loads
• Are installed in the ground or touch soil
• Are exposed to saltwater splash or frequent moisture
• Are permanent or difficult to replace
• Require compliance with building codes or inspections

Common Use Cases

Critical Structure treated wood is commonly used for:

• Deck beams, joists, and structural posts
• Ledger boards and stair stringers
• Dock framing (freshwater or saltwater splash zones)
• Pergola and pavilion framing
• Retaining walls and landscape support structures
• Boardwalk and walkway substructures

Benefits of Critical Structure Treated Lumber

• High treatment retention for superior structural protection
• Approved for ground contact and saltwater splash exposure
• Withstands harsh environmental conditions
• Supports long-term structural integrity and safety
• Meets AWPA standards
• Available in multiple sizes and profiles
• Backed by the ProWood® Lifetime Limited Warranty

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