Choosing Treated Pilings for Docks & Marine Projects

Docks, piers, and other waterfront structures live in one of the harshest environments for wood. Constant moisture, wet soil, and changing water levels break down untreated material fast. Choosing the right treated pilings is the difference between a structure that lasts decades and one that fails early.

Here is what to look for when selecting pilings for marine and foundation projects.

Why Treatment Level Matters

Not all treated wood is equal. Pilings in or near water need a higher level of treatment than a typical fence post.

• Ground-contact and water-contact applications require heavier treatment retention
• Proper treatment resists rot, decay, and insect damage in constant moisture
• Under-treated wood in water fails quickly and is expensive to replace

Sizing Your Pilings

Piling diameter and length depend on the load, water depth, and soil conditions.

• Larger diameters carry heavier structural loads
• Length must account for water depth plus adequate embedment into the bed
• Plan extra length for tidal or seasonal water-level changes

Embedment Depth

A piling is only as strong as what holds it. Adequate embedment into the lakebed or soil provides the lateral and vertical support the structure depends on. Soft or mucky bottoms require deeper embedment than firm soil.

Common Marine and Structural Uses

• Docks and piers
• Boat lifts and mooring
• Foundations and structural support
• Erosion control and shoreline structures

What Makes Wood Last in Water

• Correct treatment retention for the exposure
• Quality, straight stock without major defects
• Proper installation and embedment
• Hardware rated for wet, corrosive environments

Build on Pilings That Last

Legacy Post & Supply provides treated poles and pilings for docks, piers, foundations, and marine applications, shipped across Michigan and nationwide. Our treated wood is built to handle moisture, soil contact, and year-round exposure.

Request a quote with your project details, or contact our team for guidance on treatment level, sizing, and embedment.