shiplap

 
Pronunciation: /ˈʃɪplap/

verb

[with object]
  • fit (boards) together by halving so that each overlaps the one below: (as adjective shiplapped) shiplapped pine used as facing for the first floor

noun

[mass noun]
  • boards which have been shiplapped, typically used for cladding: shingles rest on roofing paper laid on shiplap
  • [count noun, usually as modifier] a joint between boards made by halving: a shiplap joint