Plastic Rebar Chairs with Base (Rebar Spacers)

What it is

The picture in Kitovu’s file shows a rebar chair with base: a grey moulded stand on a round, scalloped base plate pierced with holes, rising to a cradle that clips one horizontal bar from above. Chairs of this kind sit under the bottom bars of a slab, so that concrete can flow under the steel and cover it once poured.

Our stock file names the item only as rebar fixings. Its height, the bar sizes the cradle takes, the material and the number per pack are not recorded yet, and the photo is all there is so far. Those figures matter: the chair height has to equal the concrete cover shown in your drawings, and the cradle has to hold your bar. How cover is set and how many spacers a slab needs are covered on the rebar spacers and cover blocks page.

How it is used

A wide base is what separates these chairs from the narrow-footed kind. Danterr, describing its own bar chairs for slabs on the ground in a technical data sheet, says a flat base protects plastic membranes from damage. Its steps, written for a similar product and not confirmed for this item:

1. Stand the chair flat on the prepared subgrade or on the plastic sheet laid over it.
2. Press the bar or mesh into the cradle at the top.
3. On sand or other unstable ground, add a wider base plate; Danterr sells one 200 mm across for its chair.
4. Space the chairs as the engineering drawings and the pour plan set out.

Whether a plate of that kind fits these chairs is not known. Listed market prices for spacers are collected on the rebar spacer prices in Tanzania page.