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What is Pressure Treated Lumber?

Pressure treated lumber is specially processed to improve its performance under demanding conditions.  It undergoes a process of vacuum and pressure cycles within a sealed cylinder which forces preservatives deep into the cellular structure of the wood. It forms a chemical bond that resists decay and attack by insects. This bonding process locks the preservative into the wood, making it highly resistant to leaching or dissolving.  

Our pressure treated lumber is available in MCA (micronized copper azole) and CCA-C (chromated copper arsenate) pressure treating processes. Hackmann stocks MCA treated lumber from YellaWood® Decking and KDAT which are backed by a lifetime limited warranty.  We also carry CCA-C treated 6x6 timbers from Wolmanized.   Need fire treated lumber?  You'll find it at Hackmann!  We have interior and exterior fire treated lumber, as well.

YellaWood Treatment

What are Use Codes?

Use Codes are crucial because they specify what construction application is appropriate for a particular lumber.  Some environments demand more from lumber, such as exterior use.  Not sure what type of preserved wood you should select?  It helps to follow the American Wood Protection Association's (AWPA) Preserved Wood Use Categories.  This code is found on the end tag or treatment stamp of lumber.  If you're not sure which code is appropriate, this Use Category Diagram from Southern Forest Products Association should help.  

Preserved Wood Diagram

Use Category Brief Description
UC1 Interior Dry
UC2 Interior Damp
UC3A Exterior Above Ground, Coated with Rapid Water Runoff
UC3B Exterior Above Ground, Uncoated or Poor Water Runoff
UC4A Ground Contact, General Use
UC4B Ground Contact, Heavy Duty
UC4C Ground Contact, Extreme Duty
UC5A Marine Use, Northern Waters (Salt or Brackish Water)
UC5B Marine Use, Central Waters (Salt or Brackish Water)
UC5C Marine Use, Southern Waters (Salt or Brackish Water)
UCFA Interior Above Ground Fire Protection
UCFB Exterior Above Ground Fire Protection

YellaWood Treated Lumber End TagYellaWood MCA Treated Lumber

YellaWood treated lumber is preserved with MCA. We stock a large variety of sizes up to 20’ lengths and have available many special sizes of lumber and timbers. Our treated 2x8 and 4x4’s are stocked in #1 yellow pine. Our 2x6 decking is stocked in a #2 prime.  Hackmann also offers in-stock 5/4x6 Standard Treated Radius Edge deck planks. Radius Edge decking is offered in 12’ and 16’ lengths. YellaWood offers a limited warranty.  YellaWood treated wood is identified by a yellow end-tag affixed to the lumber.

ProWood Treated Lumber End TagProWood MCA Treated Lumber

ProWood treated lumber from Universal Forest Products is pressure-treated with MCA.  When you choose ProWood ®, you get superior lumber preferred by professional builders — backed by a Lifetime Limited Warranty.  Select ProWood for quality that lasts!  We stock ProWood in 2x10s and 2x12s in #1 yellow pine.  ProWood treated wood is identified by a white end-tag affixed to the lumber.  


Wolmanized Treated Lumber End TagWolmanized CCA Treated Lumber

Wolmanized Wood is pressure-treated with CCA-Type C preservative to provide structural protection from fungal decay and termites.  This treatment gives the lumber a higher use code than is possible with MCA.  We stock this in 6x6 timbers in 8', 10', 12', 14', 16', and 20' lengths.  For best protection and as a requirement for Wolmanized's limited warranty coverage, always treat cut ends with a wood preservative end-cut solution containing a minimum of 0.675% copper as oxine copper (copper-8 or copper-8-quinolinolate) or 1% copper as copper naphthenate.  Hackmann stocks Woodlife CopperCoat Green Wood Preservative which contains copper naphthenate.  Wolmanized treated wood is identified by a green end-tag affixed to the lumber. 

Wolmanized Treated Lumber


Interior and Exterior Fire Treated Lumber

We offer both interior and exterior fire retardant treated lumber supplied by Hoover Treated Wood Products®. The interior fire retardant is Hoover Pyro Guard® and the exterior is Hoover Fire-X®.   

Pyro-Guard is impregnated deep into the wood with pressure to provide permanent protection, unlike coatings, which only provide superficial protection.

When Pyro-Guard treated wood is exposed to fire, non-combustible gas and water vapor are produced, and a layer of protective char forms, which hinders combustion and insulates the wood against further damage.

Pyro-Guard interior fire-retardant-treated wood has a low rate of fuel contribution and heat release, and it maintains structural integrity longer than other building materials such as steel. Consequently, fire damages and repair costs are minimized, resulting in reduced insurance rates. 

Fire treated lumber is identified by a stamp directly onto the wood face.  

Pyro-Guard Fire Treated Exterior Lumber


KDAT YellaWood Treated Lumber End TagKDAT #1 Yellow Pine

We also stock YellaWood Professional grade KDAT(kiln dried after treatment). KDAT lumber is stronger, lighter and cleaner to work with. It has reduced cupping, twisting and warping, has increased fastener holding power and can be stained or painted immediately after installing. KDAT YellaWood is the best choice for your next project for the best results at only a small up-charge.  KDAT treated lumber is identified by a yellow end tag. 


What's in Stock?

We're pleased to offer you a fine assortment of treated lumber sizes.  Check out our selection!  Learn more about grades of treated lumber with this helpful video from YellaWood:

KDAT #1 Yellow Pine

SKU SIZE GRADE USE TYPE
A21012TKD 2x10 - 12' #1  UC4 KDAT .15 MCA
A21014TKD 2x10 - 14' #1 UC4 KDAT .15 MCA
A21016TKD 2x10 - 16' #1  UC4 KDAT .15 MCA
A21020TKD 2x10 - 20' #1  UC4 KDAT .15 MCA

Treated #1 Yellow Pine

SKU SIZE GRADE USE TYPE
A22PICT 2x2 - 42" Picket #1 UC3 .06 MCA
A228T 2x2 - 8' #1  UC3 .06 MCA
A288T 2x8 - 8' #1 UC4 .15 MCA
A2810T 2x8 - 10' #1 UC4 .15 MCA
A2812T 2x8 - 12' #1 UC4 .15 MCA
A2814T 2x8 - 14' #1 UC4 .15 MCA
A2816T 2x8 - 16' #1 UC4 .15 MCA
A2820T 2x8 - 20' #1 UC4 .15 MCA
A2108T 2x10 - 8' #1 UC4 .15 MCA
A21010T 2x10 - 10' #1 UC4 .15 MCA
A21012T 2x10 - 12' #1 UC4 .15 MCA
A21014T 2x10 - 14' #1 UC4 .15 MCA
A21016T 2x10 - 16' #1 UC4 .15 MCA
A21018T 2x10 - 18' #1 UC4 .15 MCA
A21020T 2x10 - 20' #1 UC4  .15 MCA
A2128T 2x12 - 8' #1 UC4  .15 MCA
A21212T 2x12 - 12' #1 UC4  .15 MCA
A21216T 2x12 - 16' #1 UC4  .15 MCA
A21218T 2x12 - 18' #1 UC4  .15 MCA
A21220T 2x12 - 20' #1 UC4  .15 MCA
A448T 4x4 - 8' #1 UC4 .15 MCA
A4410T 4x4 - 10' #1 UC4 .15 MCA
A4412T 4x4 - 12' #1 UC4 .15 MCA
A4416T 4x4 - 16' #1 UC4 .15 MCA
A2618T 2x6 - 18" #1 UC4 .15 MCA

Treated #2 Prime Yellow Pine

SKU SIZE GRADE USE TYPE
A268T 2x6 - 8' #2 Prime UC4 .15 MCA
A2610T 2x6 - 10' #2 Prime UC4 .15 MCA
A2612T 2x6 - 12' #2 Prime UC4 .15 MCA
A2614T 2x6 - 14' #2 Prime UC4 .15 MCA
A2616T 2x6 - 16' #2 Prime UC4 .15 MCA
A2620T 2x6 - 20' #2 Prime UC4 .15 MCA 

Treated #2&Btr Yellow Pine

We work hard to provide you with the best quality for the best price.  Therefore, our stock of 6' x 6' timbers varies.  Check the end tag for use code.  

SKU SIZE GRADE USE TYPE
A668T 6x6 - 8' #2&Btr

UC4A

UC4B

.15 MCA

.60 CCA

A6610T 6x6 - 10' #2&Btr 

UC4A

UC4B

.15 MCA

.60 CCA

A6612T 6x6 - 12' #2&Btr

UC4A

UC4B

.15 MCA

.60 CCA

A6614T 6x6 - 14' #2&Btr

UC4A

UC4B

.15 MCA

.60 CCA

A6616T 6x6 - 16' #2&Btr

UC4A

UC4B

.15 MCA

.60 CCA

A6620T 6x6 - 20' #2&Btr

UC4A

UC4B

.15 MCA

.60 CCA


Treated #2 Yellow Pine

SKU SIZE GRADE USE TYPE
A168T 1x6 - 8' #2  UC4 .15 MCA
A1612T 1x6 - 12' #2 UC4 .15 MCA
A1816T 1x8 - 16' #2 UC4 .15 MCA
A248T 2x4 - 8' #2  UC4 .15 MCA
A2410T 2x4 - 10' #2  UC4 .15 MCA
A2412T 2x4 - 12' #2 UC4 .15 MCA
A2414T 2x4 - 14' #2 UC4 .15 MCA
A2416T 2x4 - 16' #2 UC4 .15 MCA

Standard Radius Edge Decking Treated Yellow Pine

SKU SIZE GRADE USE TYPE
A54612T 5/4x6 - 12' Standard RED  UC4 .15 MCA
A54616T 5/4x6 - 16' Standard RED  UC4 .15 MCA

Exterior Fire Treated Yellow Pine

SKU SIZE GRADE USE TYPE
2616EXTFT 2x6 - 16'   UCFB FIRE-X
21016EXTFT 2x10 - 16'   UCFB FIRE-X 
21216EXTFT 2x12 - 16'   UCFB FIRE-X

Interior Fire Treated Yellow Pine

SKU SIZE GRADE USE TYPE
2416FT 2x4 - 16'   UCFA PYRO-GUARD
2616FT 2x6 - 16'   UCFA PYRO-GUARD

Landscape Timbers

SKU SIZE GRADE USE TYPE
LT 3x4 - 8"   UC4  
RRT2 RAILROAD TIE 8' USED UC4 Creosote

When Can Treated Lumber Be Painted or Stained?

When is your pressure-treated wood ready to paint or stain?  We've got the answer at your fingertips with this helpful video from YellaWood:


Want To Learn More?

Want to learn more about pressure treated lumber?  This publication from Southern Forest Products Association will tell you all there is to know about treated yellow pine lumber.  

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