The Deck Professor

Lessons / Guards and railings

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Gaps under rails and beside stairs

Close every gap a 100 mm (3 15/16 in) sphere could pass
5 inGap under the bottom rail
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A 5 in gap under the bottom rail, left so the deck can be swept.

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

The sphere also tests the gap under the bottom rail and the triangle beside a stair.

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