Learn more about installation for LP Smartside siding products.

We’re proud be a Master Member as an LP BuildSmart preferred contractor. We frequently get questions about our siding installation practices and we want to make sure you have the answers you need:

  • Butt joints must occur over studs.
  • 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.

3/8″ gap (proper detail)

Lacks 3/8″ gap at butt joint
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