Due to corrosion issues with the current chemicals used in treated wood, I have been specifying as little treated wood as possible. This isn’t that hard considering most of my projects are non-combustible steel/concrete/cmu jobs.
Anyone still spec’n treated wood and if so…mind sharing exactly where and why?
The code requires it when in contact with masonry. Switched to naturally resistant species for blocking for roofing systems. In other scenarios where PT was advisable due to frequent contact with water/moisture. When in contact with steel, I specified separation sheets such as self-stick air-water barrier sheets. Spec’d stainless fasteners, too.
Yes there are corrosion issues with fasteners when using treated wood. I typically specify either highly galvanized G180 or stainless steel or epoxy coated fasteners.
Here is a good article: http://www.ggashi.com/wordpress/wp-content/uploads/PT-Lumber-Causes-Steel-Corrosion.pdf
Simpson Strong-Tie also has a wealth of knowledge on using their connectors with treated wood: https://www.strongtie.com/products/product-use-information
Brian,
Mostly FRTW lumber for interior blocking, backing and plywood for terminal backboards.
Occasionally for roof parapet blocking for nailing base.
Also required for the core (typically MDF) for wood wall paneling in means of egress such as through a lobby.
And what John B wrote.
About a decade ago the main driver for me to drastically reduce the use of pressure treated wood was complaints from roofing contractors. They were so frustrated with the twisting and cupping of treated wood. At that point I re-examined where code required it and reduced it to that. And as the others have indicated, stainless steel or epoxy-coated fasteners and separation sheets are essential.