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I am buying a house with hardiplank siding and one side of the house there are gap between the planlk which was caulked. How much space should be between the hardiplanks to avoid gaps with caulking?
 

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If your existing Hardi doesn’t have seam flashing then defiantly caulk the joints.

Not sure why the changed the rules on butt joints other than ascetics. They only say “not recommended” on the primed product and not “don’t do it“.

It’s tough for me to walk away from opened up butt joints flashed or not.
 
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