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Old 09-16-2015, 12:28 AM   #11
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Join Date: Aug 2011
Location: Albany, GA.
Posts: 594
One other note on this subject: When using the concrete block piers- -Go to your favorite big box builders supply store and find the sheet metal pieces that are made to go on top of the concrete piers. Actually when using concrete block piers it is advisable for the topmost block to be a "cap block", which is solid and laid flat in use, and maybe 4" thick. When setting up the piers place this sheet metal on top of the cap block, place a piece of roofing felt to match the size of the piers on top of the sheet metal, then place a piece of 1/2" (minimum) plywood on top of all this. Do use wooden shims to wedge between the plywood and the TT frame. Find the larger builder shims and not the small door framing shims. This set-up will make the entire unit more stable and less likely to shift/change over time. The sheet metal deters crawly things from climbing up the piers and entering the TT. The roofing felt acts as a vapor barrier to prevent moisture from wicking from the concrete block(s) into the plywood. The plywood prevents the wooden shims from moving and coming loose. Don't ask me how I know (from experience) that wooden shims placed on either concrete or metal will come loose, they will. Have you ever wondered how a picture hanging in a house becomes crooked in time? The earth's rotation, the same thing that makes wooden shims come loose .

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