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Treated Lumber at McCoy's Building Supply

Treated Lumber

Selecting The Right Wood For The Elements

Not all wood is created equal. McCoy’s pressure treated lumber is high quality and treated with an environmentally preferred MCA preservative (Micronized Copper Azole). In fact, ALL 2x6 and Greater Dimensional Pine Lumber at McCoy’s is treated for Ground Contact, which means it has almost twice the concentration of chemical preservatives as Above Ground rated lumber, ensuring the wood in your project will last for years to come.

When planning a build, you’ll need to determine what type of treated lumber to buy and where to use it. Should you choose Ground Contact or Above Ground rated lumber?  Let’s break down the terms:

Above Ground Rated Lumber

Above Ground Rated Lumber

Lumber stamped Above Ground Use should be used at least 6” above the ground (final grade after landscaping) in places with good air circulation, water drainage, and limited contact with vegetation or leaf litter. Spindles, railings and balusters are good examples of places where Above Ground Rated Lumber is acceptable.

Ground Contact Lumber

Ground Contact Lumber

Lumber that’s pressure treated for Ground Contact is used less than 6” above the ground where there is a high risk of rot from prolonged exposure to ground moisture, fungal decay and insect infestation. It’s also important to use Ground Contact lumber for components that would be difficult to maintain, repair or replace and are critical to the performance and safety of the structure, no matter the distance above the ground. It should be used for decking, posts, stringers, beams, ledgers and joists.

Labels and Safety

Be sure to check the label on the end of the board – the higher the chemical retention level, the more rot-resistant the board. And if you’re nervous about buying lumber that’s been treated with chemicals, worry not. Micronized Copper Azole* is the recipient of an Environmentally Preferred Product designation from Scientific Certification Systems. MCA lumber preservatives are registered with the EPA and provide long-lasting, clean-to-the-touch protection against rot, fungal decay and termite attack with no objectionable odor and excellent painting and staining capabilities. 

Click here for more information about Micronized Copper Azole.

Fastener Requirements

Depending on the treatment level of your lumber, you’ll want to use connectors and fasteners manufactured to prevent corrosion and staining. It’s important to choose hot-dip galvanized, stainless, or other fasteners as required by local building codes. The thicker the zinc layer the better, but be sure to choose a fastener with a minimum G-185 coating for Ground Contact applications.

Whatever route you take, it’s best not to mix and match metals and coatings. states, “If you choose hot-dip zinc-galvanized connectors, use fasteners and hardware with the same coatings.” You don’t want different metals to start their own corrosive reactions.

Shop Lumber Products

Please contact your local McCoy’s Store to learn even more about purchasing the right treated lumber for your project.

Warranty Resource Information

MicroPro® | American Wood Protection Association | Yellawood Warranty | Koppers Warranty