Resources for Construction and Guildelines


Working with Treated X-Beam

Important Tips and Practices

Structural Design Tips

Proper Design and Construction

Pressure treated wood is not entirely immune to rot and decay. Thoughtful design detail and construction practices will extend the life of any structure. For instance poor design can create collection zones for organic matter such as dirt and leaves that can cause moisture to collect and become trapped. Organic matter can collect in cracks and in between poorly detailed or flashed connections creating a perfect environment for fungi growth. At the design stage, every effort should be made to allow for ventilation or air circulation and  water to shed off - this is particularly critical at connections.

Preservative treatment creates an envelope of protection around the wood. Field fabrication involving cutting, notching or drilling after treatment breaks this envelope, exposing untreated wood to attack by decay fungi and insects. Decay potential in field-drilled holes and sawn surfaces can be reduced with proper field treatment of the cut surfaces during construction.

Information on Deck Building

Field Treatment

All field cuts, holes or beam damage that occurs after treatment must be field treated to protect the exposed wood material. Application of a copper naphthenate solution having a minimum 2% metallic solution is specified in accordance with AWPA Standard M4. Some of the 2% (metal) products that are currently available are:

  • Cupernol – Green #10
  • Wolmanized – End Cut Solution
  • Jasco – Ternin-8, Copper Green, Copper Brown