Joist
A member supporting boards; section, support and spacing require verification.
TarasTo
Deck planning glossary
Definitions of board, joist, on-centre spacing, expansion gap, pedestal, slope, fascia and spare material.
On-centre spacing
Distance between the centres of adjacent supports.
Expansion gap
Space allowing material movement and water drainage.
Pedestal
Adjustable support point for a paver or subframe.
Fascia
Visible edge finish that often needs additional support.
Spare material
Extra material for cuts, selection and damage.