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Should You Caulk Hardiplank

James Hardie DOES NOT recommend using caulk or “H”-jointers for the butt joints of HardiePlank® siding with ColorPlus® technology. James Hardie also DOES NOT recommend applying caulk to the horizontal overlap between siding planks (see Figure 2). Should you caulk Hardie board siding? When James Hardie siding products butt into…