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1. Backing for chinking on exterior of structure? 2. Backing for chinking on interior of structure? 3.Open cell vs Closed Cell backing application/where-where not and why? 4.Blue/Pink Board Acceptable application? Log gaps are variable from end to center to end. Confused???? Thanks for best answers not mfg based for sales

It is recommended that a ”closed cell” foam be used. There tends to be a lot of discrepancy on whether open cell or closed cell off gases. My experience is that you should not use the blue, pink or bead board insulation behind latex chink. I have seen some terrible cases of bubbling from off gassing from these materials. Use Grip Strip backer. It comes in different sizes or you can cut to fit where needed.
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