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Lessons / Water and durability
Spot it
Tape on the joist tops
Show a hint
Bare joist tops under the board gaps, where water sits all day.
Every number here is a working estimate. Check it with your building authority.Turn JavaScript on to work the lesson. The drawing shows how it starts.
The rule this lesson teaches
Joist tape keeps water out of the fastener holes along the top of each joist.