MicroPro® technology offers many benefits including significantly improved corrosion performance. Wood treated with MicroPro® technology exhibits corrosion rates on metal products similar to untreated wood.
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.
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:
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.
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:
Examples of aluminum products include siding, roofing, gutters, door and window trim, flashing, 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:
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 such as boat construction.
Download the MicroPro® Fastener & Hardware Information Sheet.