Instructions / Assembly
Fastener and Hardware Fastener and Hardware
Information SheetInformation Sheet
Treated Wood ProductsTreated Wood Products
MicroPro® technology offers many benets including signicantly improved corrosion performance. Wood
treated with MicroPro technology exhibits corrosion rates on metal products similar to 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, MicroPro treated wood should not be used in applications where trapped
moisture or water can occur. Where design and/or actual conditions allow for constant, repetitive or long
periods of wet conditions, only stainless steel 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 MicroPro 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 project 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.
Other fasteners and hardware as recommended by the manufacturer There may be additional products
(other than stainless steel or hot-dip galvanized) which are suitable for use with MicroPro treated wood. Please
consult with the individual fastener or hardware manufacturer for recommendations for use of their products
with MicroPro treated wood. In addition, carbon steel fasteners may be used for interior, above ground,
weather-protected applications such as sill plates, interior framing and interior trusses.
Aluminum building products may be placed in direct contact with MicroPro treated wood products used for
interior uses and above ground exterior applications such as:
• Decks
• Fencing
• Landscaping projects
Examples of aluminum products include siding, roong, gutters, door and window trim, ashing, nails, fasteners
and other hardware connectors. However, MicroPro 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, or remain in contact with a continual moisture source, standing water
or water immersion. In addition, MicroPro treated wood should not be encased, sealed, or wrapped with
aluminum products where trapped moisture or water can occur so as to avoid pitting or other unwanted results.
We recommend you contact the aluminum building product manufacturer for their recommendations
regarding their aluminum products in contact with MicroPro treated wood used in ground contact applications
or when MicroPro 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. Contact Koppers Performance Chemicals Inc. for further information on aluminum contact
use in commercial, industrial, and specialty applications.
MicroPro pressure treated wood products are treated with Micronized Copper Azole. MicroPro products are produced by independently owned and operated wood treating facilities.
MicroPro
®
is a registered trademark of Koppers Performance Chemicals Inc. © 1/2021