bldginsp
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# Posted: 22 Jun 2016 01:42 - Edited by: bldginsp
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Very timely for me Don as I'm having Hardi put onto my cabin right now.
The contractor had an interesting suggestion. Perhaps the worst area of exposure for this kind of siding is wherever it butts against siding. The caulk joint will invariably fail, some moisture gets in, failure can result. So, what he does is to apply double trim vertically. First he applies a trim board the same thickness as two thicknesses of overlapping siding. Then he installs the siding, butted to the first trim. Then he applies a second vertical trim over the first, and overlapping the siding, leaving a 'shadow detail' in the triangles beneath the lower lip of each plank. Thus effectively the but joint is covered.
Something similar has often been done with shiplap siding in the past. I never liked it because I don't like to see holes- it looks unfinished to me. Also with wind, water can blow into the holes defeating the purpose. Or you can buy 10 cases of caulk and fill them all.
I opted not for this alternative, and told him to just butt to the trim, but to paint the cut ends of siding as he installs. I guess that is the best insurance against the water absorption that eventually degrades the integrity of the cement/fiber compound.
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