How Many Bar Chairs Do I Need For A Waffle Pod Slab?

Various builders, contractors, and construction companies use bar chairs in multiple applications.

Bar chairs are a tool that helps hold reinforcing mesh into the correct position.

Bar chairs are essential because failing to use the proper amount on your project can lead to the incorrect amount of clear cover allowed resulting in a weak foundation.

Bar chairs

Various steel applications use bar chairs; waffle pod slabs rely on bar chairs to maintain structural stability.

Bar chairs also work for applications that involve on-ground slabs, retaining wall footings with metal bases, suspended slabs and many more.

You can buy bar chairs in bags of 20, 50, and 100 all depending on the size of chair.

Continue reading to find out how to accurately calculate the number of bar chairs you’ll need for your next building project.

How many bar chairs do I need for a waffle pod slab?

To determine how many bar chairs you’ll need for a new waffle pod slab, you’ll have to do some calculations.

The equation is quite simple, which is good news. First, divide the length of your slab’s perimeter beam by 1.2; this will give you the total amount of trench mesh chairs.

Waffle pod slab with bar chairs

Next, you need to multiply the number of waffle pods by 4 to find the total number of bar chairs you’ll need.

This will give you the precise amount of bar chairs that’ll you’ll need for your project.

Essentially you need to have 4 bar chairs for every waffle pod in your slab.

Calculating the right amount of bar chairs for your next project

By installing the correct amount of bar chairs in your concrete slab, you’ll have a much easier time pouring the concrete without the steel reinforcing shifting around and allowing the correct concrete cover determined by your engineer.

People Also Ask

Q: How long do bar chairs last?

A: Most bar chairs are made of plastic which means they won’t corrode and will definitely last long enough for the concrete slab to be poured.

Q: What is a waffle pod slab?

A: Waffle pods are rafts that lay flat on top of your soil; they help secure the foundation of your building. A waffle pod slab is determined by a series of pods laid in a grid pattern (waffle pattern).

Q: Which is better waffle pod slab or raft slab?

A: Conventional raft slabs are great because they are stable and installed below ground. Compared to waffle pod slabs, traditional raft slabs last a lot longer than waffle pod slabs.

Waffle pod slabs have many time and concrete saving advantages over a conventional slab though.

There are many things to consider when choosing which type of slab is best for your project.


If you’re unsure how many bar chairs to use, consult your building engineer to ensure you use the correct amount for the specified plans.

We also have specialist estimators, who are able to provide you with a take-off of your building plans if required.

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