Originally Posted By: mpettitt
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Florida concrete block home.
Could someone explain (in a technical manor) the purpose for the metal shim that separates the bottom chord of the roof trusses from the top of the concrete block walls. I know its there to prevent a chemical reaction between the wood and concrete. But wood like to know exactly what will happen to the wood w/o them and how long before problems will develop. This home is a under construction and about 15% of the shims are missing. Also, would it be possible to install the missing shims after the trusses are already up and how much of a “big deal” should I make of it. Thanks