MCA Wood Treatment Information

MCA Treatment Important Information

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MCA Treatment Important Information:

  • MCA (Micronized Copper Azole) Pressure treated wood has corrosion rates on metal products similar to CCA (chromated copper arsenate) pressure treated wood and untreated wood.
  • Use fasteners and hardware that are in compliance with the manufacturer's recommendations and the building codes for their intended use. When using aluminum products in conjunction with MCA treated wood, refer to the MCA Fastener & Hardware Information listed below for additional information.
  • Do not burn preserved wood.
  • Wear a dust mask and goggle when cutting or sanding wood.
  • Some preservatives may migrate from the treated wood into soil/water or may dislodge from the treated wood surface upon contact with skin. Wash exposed skin areas thoroughly.
  • All sawdust and construction debris should be cleaned up and disposed of after construction.
  • Wash work clothes separately from other household clothing before reuse.
  • Preserved wood should not be used where it may come in direct or indirect contact with drinking water, except for uses involving incidental contact such as fresh water docks and bridges.
  • Do not use preserved wood under circumstances where the preservative may become a component of food, animal feed, or beehives.
  • Do not use preserved wood as mulch.
  • Only preserved wood that is visibly clean and free of surface residue should be used.
  • If the wood is to be used in an interior application and becomes wet during construction, it should be allowed to dry before being covered or enclosed.
  • Disposal Recommendations - Preserved wood may be disposed of in landfills or burned in commercial or industrial incinerators or boilers in accordance with federal, state, and local regulations.
  • If you desire to apply a paint, stain, clear water repellent, or other finish to your preservative treated wood, we recommend following the manufacturer's instructions and label of the finishing products. Before you start, we recommend you apply the finishing product to a small exposed test area before completing the entire project to insure it provides the intended result before proceeding.
  • Projects should be designed and installed in accordance with federal, state, and local building codes and ordinances governing construction in your area and in accordance with the National Design Specifications (NDS) and the Wood Handbook.
  • Mold growth can and does occur on the surface of many products, including untreated and treated wood, during prolonged surface exposure to excessive moisture conditions. To remove mold from the treated wood surface, wood should be allowed to dry. Typically, mild soap and water can be used to removed remaining surface mold. For more information visit


Proven performance for above and ground contact at the following levels:

Above Ground: 0.06 pcf
Ground Contact: 0.15 pcf

MCA Treated Wood Products

MCA (Micronized Copper Azole) exhibits corrosion rates on metal products similar to CCA pressure treated wood and untreated wood.

  • For Interior or Exterior Applications, use fasteners and hardware that are in compliance with the manufacturer's recommendations and the building codes for their intended use. As with any good design and construction practices, MCA treated wood should not be used in applications where trapped moisture or can occur. Where design and/or actual conditions allow for constant, repetitive or long periods of wet conditions, only stainless stell fasteners should be used.
  • For Exterior Applications: The following minimum galvanization levels may be used for connectors, joist hangers, fasteners and other hardware that are placed in direct contact with exterior applications of treated wood which utilizes MCA Technology.

    Fasteners - Nails, screws, etc. ASTM - A 153 (1 oz/ft2)
    Hardware - Connectors, joist hangers, etc. ASTM - A 653 G90 (0.90 oz/ft2)

    The effects of other building materials within a given assembly, along with environmental factors, should also be considered when selecting the appropriate hardware and fasteners to use for a given projects containing treated wood.

    Stainless Steel fasteners and hardware are required for Permanent Wood Foundations below grade and are recommended for use with treated wood in other severe exterior applications such as swimming pools, salt water exposure, etc. Type 304 and 316 are recommended grades to use.

Aluminum building products may be placed in direct contact with MCA treated wood products used for interior uses and above ground exterior applications such as:

  • Decks
  • Fencing
  • Landscaping Projects

Examples of aluminum products include siding, roofing, gutters, door and window trim, flashing, nails, fasteners and other hardware connectors. However, MCA treated wood in direct contact with aluminum products should only be used in code compliant construction applications that provide proper water drainage and do not allow the wood to be exposed to standing water or water immersion.

We recommend you contact the aluminum building product manufacturer for their recommendations regarding their aluminum products in contact with MCA treated wood used in ground contact applications or when MCA treated wood is exposed to:

  • Salt water
  • Brackish water
  • Chlorinated water, such as swimming pools or hot tubs

Also check with the aluminum product manufacturer regarding compatibility with other chemicals and cleaning agents.

For more product and sales info, contact Tarheel Wood Treating at 919-467-9176