Don't know if this belongs in Gardening or Outdoor Projects, but here goes.
I'm building a patio wall/planter using concrete blocks on the inside and brick on the outside. I had left over brick from a house addition and this seemed like a good way to use it. I went with the concrete block inside because I figured the brick wouldn't stand up to direct dirt contact all that well. I'm also thinking I might coat the inside of the concrete blocks with tar, or whatever is used on the outside of foundations to waterproof them. My thinking is tht if I limit the water soaking into the concrete blocks, that will perhaps prevent failure of the block-to-brick interface. The bricks will be directly mortared to the block, and I was thinking that mortar joint might suffer from a lot of moisture. I did incorporate some brick ties in the block joints, but could only get so many of them in there. So, am I being overly anal about this? Anyone see any problem with coating the dirt side of the blocks? I do plan to have some herbs and maybe other edibles in this planter, in addition to flowers, but I wouldn't think a tar-like coating would cause problems.
Chuck
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