If ya'll have not tried White Oak for your outdoor projects, you are missing a great wood for that.  Not only is it very strong and fairly economical, it stands up to the elements very well.  As I mentioned earlier - be sure to read the fine print on whatever spray foam you use.  Some is designed for minimal expansion pressure (For that reason, the proper product to use when installing doors & windows.) while others will exert a fair bit more pressure while expanding more.  If I were going to "foam" a column, I'd call Dow's Technical Support line, tell them what I was planning to do, and ask them what they recommended.  Who knows, you may get them thinking - and next thing we know they develop a product designed SPECIFICALLY for filling the cavity in hollow columns! 
Mac
 ___________________________________________________________________________________
-----Original Message-----
From: Don Butler
Sent: May 7, 2014 5:59 PM
To: legacy-ornamental-mills@googlegroups.com
Subject: Re: outdoor hollow columns & Great Stuff(ing)



Lil Twisted,
>
I fill mine in the shop, too. It doesn't make them that much heavier.
If I used a better grade of wood, I might consider leaving them open.
I would have to think hard about filling the columns after installation,
for fear of making a mess on the entryway.

Best regards,
Don "Dances With Wood" Butler

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