A minimum 3/8 inch (5 mm) gap is required at ALL butt joints.
If joint molding option is selected, add the thickness of the web to the gap allowing a net 3/8 inch (5 mm) space for expansion.
If siding is prefinished by a Preferred Prefinisher, the gap does not require sealant or joint molding when backed with minimum 4 inch (102 mm) wide flashing and the ends of the siding are factory finished.
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