Thanks, that was what I was angling for, a good tight fit that didn't require any nails, glues, or mortar.
My test blocks I made last summer without cement have held up very well despite being left outside in the elements, so I was questioning the need for any cement apart from protecting the PC insulation from bugs. I have seen termites around my house, so I know they're nearby.
I've already purchased several boxes of 20 Mule Team as well.
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