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4-in x 4-in Pressure Treated Lumber

19 results

Severe Weather 4-in x 4-in #2 Southern yellow pine Ground contact Pressure Treated Lumber
Multiple Sizes Available

Severe Weather 

4-in x 4-in #2 Southern yellow pine Ground contact Pressure Treated Lumber

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4.4
10938
Drying Method:Kiln-dried
Actual Thickness (in):3.5
For Use with:Decking, Landscaping, Fencing
Severe Weather 4-in x 4-in Standard Hem Fir Ground Contact Pressure Treated Lumber
Multiple Sizes Available

Severe Weather 

4-in x 4-in Standard Hem Fir Ground Contact Pressure Treated Lumber

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4.5
381
Drying Method:Green
Actual Thickness (in):3.59
For Use with:Decking, Landscaping, Fencing
Severe Weather 4-in x 4-in Standard Hem Fir Ground Contact Pressure Treated Lumber
Multiple Sizes Available

Severe Weather 

4-in x 4-in Standard Hem Fir Ground Contact Pressure Treated Lumber

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for pricing and availability

4.4
401
Drying Method:Green
Actual Thickness (in):3.625
For Use with:Decking, Landscaping, Fencing
Severe Weather 4-in x 4-in #2 Southern Yellow Pine Ground Contact Pressure Treated Lumber
Multiple Sizes Available

Severe Weather 

4-in x 4-in #2 Southern Yellow Pine Ground Contact Pressure Treated Lumber

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for pricing and availability

4.2
159
Drying Method:Kiln-dried
Actual Thickness (in):3.53
For Use with:Decking, Landscaping, Fencing
Severe Weather 4-in x 4-in Pressure Treated Hem Fir Lumber
Multiple Sizes Available

Severe Weather 

4-in x 4-in Pressure Treated Hem Fir Lumber

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4.2
135
Drying Method:Green
Actual Thickness (in):3.62
For Use with:Decking, Landscaping
Severe Weather 4-in x 4-in x 12-ft #2 Hem fir Ground contact Pressure Treated Lumber
Multiple Sizes Available

Severe Weather 

4-in x 4-in x 12-ft #2 Hem fir Ground contact Pressure Treated Lumber

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for pricing and availability

4.5
490
Drying Method:Green
Actual Thickness (in):3.59
For Use with:Decking, Landscaping, Fencing
Severe Weather 4-in x 4-in x 8-ft #2 Btr Douglas fir Ground contact Pressure Treated Lumber

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4-in x 4-in x 8-ft #2 Btr Douglas fir Ground contact Pressure Treated Lumber

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for pricing and availability

4.1
3422
Drying Method:Green
Actual Thickness (in):3.562
For Use with:Decking, Landscaping, Fencing
Severe Weather 4-in x 4-in #2 Btr Douglas fir Above ground Pressure Treated Lumber
Multiple Sizes Available

Severe Weather 

4-in x 4-in #2 Btr Douglas fir Above ground Pressure Treated Lumber

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for pricing and availability

4.8
18
Drying Method:Green
Actual Thickness (in):3.62
For Use with:Landscaping
Severe Weather 4-in x 4-in x 8-ft #2 Southern yellow pine Ground contact Pressure Treated Lumber

Severe Weather 

4-in x 4-in x 8-ft #2 Southern yellow pine Ground contact Pressure Treated Lumber

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for pricing and availability

4.2
29
Actual Thickness (in):3.5
For Use with:Decking, Landscaping, Fencing
Severe Weather 4-in x 4-in x 7-ft Standard Hem fir Ground contact Pressure Treated Lumber

Severe Weather 

4-in x 4-in x 7-ft Standard Hem fir Ground contact Pressure Treated Lumber

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for pricing and availability

4.1
3422
Drying Method:Green
Actual Thickness (in):3.5
For Use with:Decking, Landscaping
Severe Weather 4-in x 4-in x 8-ft #2 Southern yellow pine Ground contact Pressure Treated Lumber

Severe Weather 

4-in x 4-in x 8-ft #2 Southern yellow pine Ground contact Pressure Treated Lumber

Find My Store

for pricing and availability

4.2
29
Actual Thickness (in):3.5
For Use with:Decking, Landscaping, Fencing
Severe Weather 4-in x 4-in x 7-ft #2 Southern yellow pine Ground contact Pressure Treated Lumber

Severe Weather 

4-in x 4-in x 7-ft #2 Southern yellow pine Ground contact Pressure Treated Lumber

Find My Store

for pricing and availability

4.3
6257
Drying Method:Kiln-dried
Actual Thickness (in):3.5
For Use with:Landscaping
Severe Weather 4-in x 4-in x 8-ft #1 Southern yellow pine Ground contact Pressure Treated Lumber

Severe Weather 

4-in x 4-in x 8-ft #1 Southern yellow pine Ground contact Pressure Treated Lumber

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for pricing and availability

4.1
3422
Actual Thickness (in):3.5
For Use with:Decking, Landscaping, Fencing
Severe Weather Hem Fir 4x4 Wood Screws Bundle

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Hem Fir 4x4 Wood Screws Bundle

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4.7
1411
Severe Weather Raised Garden Bed

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Raised Garden Bed

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4.3
6653
Severe Weather Raised Garden Bed

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Raised Garden Bed

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4.4
36413
Severe Weather 4-in x 4-in x 16-ft Standard Hem fir Ground contact Pressure Treated Lumber

Severe Weather 

4-in x 4-in x 16-ft Standard Hem fir Ground contact Pressure Treated Lumber

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for pricing and availability

Drying Method:Green
Actual Thickness (in):3.59
For Use with:Decking, Landscaping, Fencing
Severe Weather 4x4x8-ft Pressure Treated Lumber Roofing Screws Bundle

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4x4x8-ft Pressure Treated Lumber Roofing Screws Bundle

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4.4
11188
Severe Weather 4x4x8-ft Pressure Treated Lumber Framing Nails Bundle

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4x4x8-ft Pressure Treated Lumber Framing Nails Bundle

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4.5
11893

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Severe Weather - 2-in x 2-in x 8-ft #1 Hem fir Above ground Pressure Treated Lumber
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1-1/4-in x 6-in x 14-ft Standard Southern yellow pine Above ground Pressure Treated Lumber (Recommended for Deck Boards)

Severe Weather   1-1/4-in x 6-in x 14-ft Standard Southern yellow pine Above ground Pressure Treated Lumber (Recommended for Deck Boards)

Pressure treated southern yellow pine decking with a lifetime limed warranty.

4-Inch x 4-Inch Pressure Treated Lumber for Durable Outdoor Projects

4-inch x 4-inch pressure treated lumber provides sturdy material for structural and outdoor projects such as decks, fences, pergolas and landscape features. Pressure treatment helps wood withstand conditions associated with appropriate exterior applications when used according to product specifications. Available in different lengths, pressure treated 4x4 wood can support projects ranging from posts to framing components. Explore the selection at Lowe’s to plan your outdoor build.


Benefits of Treated 4x4 Lumber

  • Outdoor Applications: Treated lumber is suitable for a variety of exterior projects when selected according to the product's designated use.
  • Structural Versatility: The 4x4 dimensions make this lumber useful for posts, supports, framing and other suitable building applications.
  • Project Flexibility: Different available lengths provide options for decks, fences, landscape structures and other outdoor projects.
  • Deck Compatibility: Posts made from suitable treated lumber can provide structural support for deck framing and compatible deck boards when installed as part of a properly planned system.
  • Natural Appearance: Wood grain and texture provide a traditional material choice that coordinates with many outdoor structures and landscape settings.


Key Features of Pressure Treated 4 by 4 Lumber

  • Pressure-Treated Construction: Treatment helps protect suitable lumber from decay and insect damage based on its specified use category.
  • Nominal Dimensions: The 4-inch x 4-inch designation provides a commonly used nominal size for posts and structural components.
  • Length Options: Available lengths help accommodate different project dimensions and reduce unnecessary cutting where suitable.
  • Ground-Contact Options: Select products are rated for applications involving ground contact. Always verify the individual lumber rating before use.


How to Choose 4x4 Treated Lumber

  • Check the Application: Select lumber with a treatment rating appropriate for the intended above-ground, ground-contact or other specified exterior use.
  • Determine the Length: Calculate required post or framing dimensions before selecting lumber to help plan cuts and material quantities.
  • Inspect the Lumber: Look for boards suited to the project with dimensions and overall condition appropriate for the intended construction.
  • Plan Post Placement: For projects requiring posts set in the ground, determine whether concrete mix is appropriate based on the project design and applicable building requirements.
  • Consider the Full Structure: When planning a deck, reviewing how to build a deck can help clarify common project stages such as layout, foundation planning, framing and surface installation before work begins.


4-inch x 4-inch pressure treated lumber can support decks, fences, pergolas and other suitable exterior structures where sturdy wood components are needed. Consider treatment rating, length and intended placement when selecting 4x4 treated wood for a project. Shop at Lowe’s to select lumber that fits your building plans while accounting for the appropriate structural hardware and installation materials.