Not at all clear what you're trying to achieve. You want them to look like wood logs? or just repair the current problem(s)?

I want to "wrap" the current columns so they look like a solid post. It's 13 feet high and the actual solid posts are way too heavy to DIY. I was thinking of using four 1x12 on each column to make it look like a solid post. Does that make sense??

Perfect! Is there a PVC product that is wide enough to fit each side?? I haven't been able to find anything wide enough. Also, the roofer is coming to fix that facia tomorrow :)

PVC would work, but there are other manmade products that I like better because they look and feel more like wood (Boral, for example, or some of the James Hardie products). Boral is available in 3/4", 1" and 1.5" thickness, and up to 12" wide (actual width 11 1/4"). You won't find it in a big box home store, but many building supply companies will carry it. http://www.reisterstownlumber.com/wp-content/uploads/2016/06/Boral-True-Exterior.pdf

Bruce

Thats just what I was looking for! Thanks to both of you for the help.