Joist Spacing and Blocking 101

Joist Spacing and Blocking
Quick Reference Guide
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STRING LINES
Before installing any decking, run
string line frequently to ensure that
the tops of the joists are in plane, as
TimberTech Decking will conform to
the contour of the joists to which it is
attached.
ENSURE ALL JOISTS ARE EVEN
ACROSS THE TOPS
While a particular joist may be level
itself, the top of that joist may still
not be in plane with surrounding
joists and could result in high or low
spots throughout the deck.
WHY?
Installed alternative/composite decking will follow the contour of the joists
beneath; if the joists are uneven, the result can be a wavy looking deck.
Example above showing the effect on decking
when attached to uneven joists/framing.
STEP ONE
Check Your Framing Before Laying the First Board