Hoop Iron Spacing and Placement Guide
This guide covers the correct spacing and placement of hoop iron in various masonry applications according to South African building standards.
Quick Reference Table
| Application | Course Interval | Hoop Iron Size | Overlap |
|---|---|---|---|
| Single-leaf wall | Every 6th course | 30mm x 0.6mm | 150mm |
| Cavity wall | Every 4th course | 30mm x 0.6mm | 150mm |
| Boundary wall (up to 1.8m) | Every 6th course | 30mm x 0.6mm | 150mm |
| Boundary wall (1.8m–2.1m) | Every 4th course | 30mm x 0.6mm | 150mm |
| Retaining wall (up to 1m) | Every 3rd course | 40mm x 0.6mm | 150mm |
| Retaining wall (1m–1.5m) | Every 2nd course | 40mm x 0.6mm | 150mm |
| Around openings | Every course | 30mm x 0.6mm | 300mm past opening |
| Top of all walls | Top course | 30mm x 0.6mm | 150mm |
General Rules
- Always use galvanised hoop iron — ungalvanised iron will rust and weaken the wall
- Overlaps must be at least 150mm — secure overlaps within the mortar bed
- Hoop iron at corners — bend at 90° and extend 300mm into adjoining walls
- Top of every wall — always place hoop iron in the final course
- Around all openings — reinforce above lintels and below sills
- Never cut corners — skipping hoop iron courses leads to cracking and potential structural failure
Frequently Asked Questions
What is the standard hoop iron spacing in brickwork?
Every 6th course for single-leaf walls and every 4th course for cavity walls, as specified in SANS 10400. Hoop iron must also be placed at the top of every wall and around all openings.
How much should hoop iron overlap?
Minimum 150mm overlap at all joints. At corners, hoop iron should bend 90 degrees and extend at least 300mm into the adjoining wall.
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