How to Reinforce Mesh Bar Chairs

Written by amy lea
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How to Reinforce Mesh Bar Chairs
Rebar mesh is reinforced with bar chairs. (Jupiterimages/ Images)

When laying cement or concrete floor slabs, it is important to reinforce mesh with bar chairs. The bar chair holds the bottom layer of the rebar used as mesh. The mesh or trench mesh rebar must have 1 1/2 feet of overlap to fulfil minimum requirements. The bar chairs or trench mesh spacers are used to secure the mesh rebar in its place based on height and distance from other bars in the mesh of the concrete flooring.

Skill level:
Moderately Challenging

Things you need

  • Rebar metal bars
  • Bar chairs
  • Cement
  • Cement mixer
  • Spade

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  1. 1

    Place a bar chair 1 1/2 feet from the edge of the area that needs cement.

  2. 2

    Place other bar chairs at 1 1/2 foot intervals from the first bar chair, moving toward the other edge of the area needing cement.

  3. 3

    Lay a bar of rebar on top of the bar chairs in the grooves provided.

  4. 4

    Repeat the placement of bar chairs at 1 1/2 foot intervals for the next row of rebar. Make sure the second row of bar chairs is 1 1/2 feet from the first row of bar chairs.

  5. 5

    Once the rows of rebar are set, place the second layer of rebar upon the first in the intervals designated by the architecture design.

  6. 6

    Pour the cement into the area designated for cementing and move it about the bar chairs slowly to make sure the bar chairs do not move from their proper places. Finish cementing the area designated as per cement instructions.

Tips and warnings

  • The bar chair is reinforced by adding the rebar to the top groove. Make sure the rebar is the proper size, as the bar chair size does not change but the rebar size does.
  • Not using bar chairs at the proper 1 1/2 foot interval could result in cracking and sinking in the cement.

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