3"x 5' SBU chairs, also known as Slab Bolster Uppers, are used to support and maintain the elevation of rebar (reinforcing steel)
. Applications
SBU chairs are commonly used in various concrete construction projects, including:
- 
- Elevated concrete decks
 - Footings
 - Slabs on metal deck
 - Bridge decks
 - Concrete patios and sidewalks
 - In essence, 3" x 5' SBU chairs are a