Metal Saddle standoff for wood columns in exterior envronment

[ajk1]

Is there an NBC or CSA Code requirement that wood columns in an exterior environment have a metal standoff saddleat the base, and if so does this requirement apply even if the post is pressure treated against decay?

 

[KootK]

I don't know of the code requirement but I commonly see a 4" standoff.

I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.

 

[Guastavino]

ajk1,

I'm not sure about the NBC or CSA codes, but for IBC its Check IBC 2304.11.2.7 Posts and columns (I'm using IBC 2009 for the reference). It refers to protection against decay and termites for Wood posts or columns. I bet if you google this section and cross check it with the above you might be able to find something. For the IBC it's my understanding that standoffs are only required if the wood is not preservative treated.

Nick

 

[ajk1]

Thanks Nick. I will try to check that out. That is very helpful.

 

[msquared48]

I would still keep any soil a minimum of 6" from the wood column, treated or not. Just my practice here.

I would also install a layer of building paper between any concrete and the wood without a metal standoff.

Simpson CB post bases work well.

Mike McCann, PE, SE (WA)

 

[ajk1]

yes ok, thanks. There is at least 8" from top of soil to post bottom, and in most cases more.