Feb 20, 2026
Pressure Treated Lumber
Decking
Pressure Treated Lumber for Decks: What You Need to Know
Pressure treated lumber is one of the most common materials used for deck framing and outdoor construction. Learn how treated lumber works, common sizes, lifespan expectations, and what impacts deck lumber pricing in Boise and the Treasure Valley.
What Is Pressure Treated Lumber
Pressure treated lumber is wood that has been infused with preservative chemicals to resist moisture, rot, and insect damage. This treatment process extends the lifespan of the material, making it ideal for outdoor applications such as decks, fences, and structural framing exposed to the elements.
For deck construction, pressure treated lumber is commonly used for framing, posts, joists, beams, and sometimes decking boards.
Common Sizes for Deck Construction
Pressure treated lumber for decks is commonly available in:
2x4
2x6
2x8
2x10
4x4 posts
6x6 posts
These sizes are typically used for joists, beams, ledger boards, and vertical supports. Selecting the correct size depends on span requirements and local building codes.
What Impacts Deck Lumber Pricing
The cost of pressure treated lumber for decks depends on:
Board size and thickness
Treatment level
Lumber market fluctuations
Freight and regional availability
Quantity purchased
Larger framing packages often reduce overall per-unit cost. Checking availability locally ensures accurate pricing based on current inventory.
Pressure Treated Lumber vs Composite Decking
While composite decking is popular for surface boards, most decks still rely on pressure treated lumber for framing. Treated wood remains the standard structural base due to strength and cost efficiency.
Many homeowners combine pressure treated framing with composite deck boards for durability and aesthetics.
What Impacts Deck Lumber Pricing
The cost of pressure treated lumber for decks depends on:
Board size and thickness
Treatment level
Lumber market fluctuations
Freight and regional availability
Quantity purchased
Larger framing packages often reduce overall per-unit cost. Checking availability locally ensures accurate pricing based on current inventory.
Pressure Treated Lumber vs Composite Decking
While composite decking is popular for surface boards, most decks still rely on pressure treated lumber for framing. Treated wood remains the standard structural base due to strength and cost efficiency.
Many homeowners combine pressure treated framing with composite deck boards for durability and aesthetics.
Finding Treated Lumber for Decks Near You
If you are building or repairing a deck in Boise or the Treasure Valley, selecting the correct grade and treatment level is essential.
Capital Lumber supplies pressure treated lumber, dimensional lumber, and structural materials for deck construction and outdoor projects. Contact the team to confirm sizing, availability, and job site delivery options.
