Every number here is a working estimate to check with your building authority. Whoever prints this page takes responsibility for what is in it.
Lessons / Decking and patterns
Change it
Gaps let the water through
Show a hint
Dry boards laid tight, so water sits on the joists.
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
About 1/8 in between boards lets water and debris fall through; wet treated boards shrink open on their own.