The FAQ's of ACQ Treated Lumber
Update: Since this article was originally published in 2004, ProWood Micro CA treated lumber has become the primary alternative to CCA treated lumber.
Why is CCA lumber no longer being sold?
What is ACQ Lumber?
What is ACQ lumber approved for?
Are there different grades of ACQ lumber?
Can I use the same metal fasteners used for CCA lumber?
The two most important things to remember when selecting deck fasteners, framing nails, decking nails or screws are: (1) holding capacity, and (2) resistance to corrosion. Using the wrong fasteners can compromise the appearance, longevity, and safety of an outdoor project.
Many fasteners traditionally used with treated lumber are no longer recommended for this application. Dacrotized, electroplated, brass, and aluminum fasteners should not be used in treated lumber when the appearance of rust or the likelihood of corrosion is unacceptable.
The following products are available at most Sutherlands locations for use with ACQ products. Manufacturers recommend these lines of product to be used with ACQ treated lumber:
Please note: One-half inch (12.7mm) or greater steel bolts are acceptable and do not require special coatings.
Aluminum should NOT be used in direct contact with ACQ preserved wood. Spacer materials or some other physical barrier are recommended to prevent direct contact. A poly barrier is recommended for any applications where ACQ will meet aluminum flashing. Do not use aluminum fasteners.
Will ACQ lumber look the same as CCA?
Sutherlands® provides these project tips and guides as a service to our visitors. Due to possible variance in conditions, equipment, materials and individual skill levels, Sutherlands® assumes no responsibility for losses or injuries incurred during maintenance or repair of your property. Sutherlands® assumes no liability for errors or omissions in the Resources section of this website. Please read and follow any safety precautions provided by tool and equipment manufacturers, and consult a building professional in your area if you have any questions about a repair project. Always check your local codes before building, and obtain the required building permits.