---
title: Reidbar Vertical Reinforcing Tensioning for Cantilever Wall Design
description: This article provides information on the tension requirements for vertical reinforced Interbloc structures.
---

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July 29, 2024

# Reidbar Vertical Reinforcing Tensioning for Cantilever Wall Design

## This article provides information on the tension requirements for vertical reinforced Interbloc structures.

**Introduction**

Reidbar vertical reinforcing is a critical component in cantilever wall designs, connecting Interbloc walls to concrete foundations. Proper tension of the Reidbar post-installation is essential to minimize the risk of block dislodgment and ensure structural safety. This article provides guidance on the tensioning process, factors affecting tension requirements, and calculation methods.

**Tensioning Principles**

Tensioning the reidbar mitigates the inherent stretch risk of the reinforcing bar, creating a safer structure. The amount of tension (torque) required depends on several factors:

- **Reidbar Size:** Larger reidbars may require higher tension.
- **Concrete Pad Connection:** The quality and design of the connection influence tension needs.
- **Epoxy Type:** The epoxy used to cement the starter bar is a limiting factor.

**Tension/Torque Calculation**

The manufacturer, Reid Construction Systems, provides tension/torque guidance. As Envirocon installations use a hydrapak system (measured in PSi), conversion from Nm (Newton meters) is necessary:

1. **Convert N to MPa:** Divide N by the cross-sectional area of the reinforcing bar.
2. **Convert MPa to Psi:** Use the appropriate conversion factor (1 MPa ≈ 145.038 Psi).

**Envirocon Installation Procedure**

Envirocon utilizes a specifically designed reinforcing bar tensioner powered by a hydrapak. The hydrapak force, measured in PSi, aligns with the converted tension requirements for the reidbar.

**Rule of Thumb**

In many cases, the limiting factor for tension is the chemset epoxy used to secure the starter bar. Adhering to the manufacturer's epoxy specifications is crucial.

**Reid Construction Systems Tension Table**

![image008](https://help.envirocon.co.nz/hs-fs/hubfs/image008.png?width=688&height=580&name=image008.png)

PSi conversion chart for hydraupak - https://www.enerpac.com/en-us/training/e/conversion-factors

 

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