pressure treated wood

[Hyrax4978]

Is there a code in the IBC that talks about the use of pressure treated wood in buildings today?
Back in the day PT wood was called out everywhere, roof edges, window surrounds etc.
But in metal framing and steel decking should PT wood be avoided these days. I have seen articles that say not to use it any more to avoid the corrosion issues. that the benefit of the preservative these days is outweighed by the corrosion.
Wondering if there is a code that talks about this?
Also would like other opinions.

Thanks,

Brian

 

[mark handler]

IBC 2303 or 2304 and chapter 18
there is a prity good list in the website presentation with the code sections
http://www.woodworks.org/wp-content...hardt-Preserved-Wood-Durable-Construction.pdf

 

[Hyrax4978]

Looks like its not required at roof edges, but 8 years ago we use to not PT blocking everywhere.
I was wondering if there was a code that prohibited the use of PT blocking in metal framed buildings, or talked about the requirement to separate them and fastener coatings to prohibit decay.
Articles written seem to say just don't use PT in the metal framing construction. But those are someones opinions. Looking to see if there is a technical determination on this.
Are you still using PT blocking at rubber roof edges?

 

[TheCommish]

The code talks about durable or pressure treated wood in contact with concreted with exceptions for barriers either under the slab or at the top of foundations walls.
It is the designer, builder, or end users responsibility to ensure materials are compatible with each other and if necessary listed for their intend purpose

 

[Francis Vineyard]

The code does speak to approved fasteners where preservative treated wood is required. These metals or fasteners could also be construed for approved flashing, siding and even exposed structural framing.

In reference to galvanic corrosion between copper and aluminum is more than .25 v and should be avoided. There have several articles about this with road signs.

As reminder though galvanized and zinc coated fasteners that are approved for preservative treated wood, it is accepted that the sacrificial coating will eventually fail.

 

[Hyrax4978]

Its clear about the type of fasteners... I did find them at section 2304.9.5..
I would think that if the fasteners must be HDG or SS then the substrate would need to be at least G90. But alot of times the studs and decking are G60. There are a ton of articles. of course all written as opinion, nothing specific. separating the PT blocking from the steel isn't hard to do, just would be nice to have a definitive answer. This has been around for many years no. surprised it hasn't been hashed out better.

 

[JCraver]

AISI S200 - North American Standard for Cold-Formed Steel Framing

That's a referenced standard in the IBC, and if you search it you can download it free. I think it has what you're looking for.