Safety Recommendations
Certified loading limits, sliding plate placements, and 70mm height allowances.
Prop Requirements by Span Length
The values below are professional, certified guidelines for masonry up to 2 blocks high with core fill only above the temporary head. More block height above means more loading weight and may require additional or closer bracing spacing.
| Rapid Head Span Length | Required Acrow Props |
|---|---|
| 0.4m – 1.8m | None Required |
| 2.0m – 2.8m | 1 Acrow Prop |
| 3.0m – 3.6m | 2 Acrow Props |
| 3.8m – 5.0m | 3 Acrow Props |
| Over 5.0m | 4+ or Dynamic |
The 50mm Seating Rule
We strongly recommend adjusting the integrated sliding plate so that it sits fully on the bearing blocks by at least 50mm on each end. This guarantees optimal, balanced load distribution and ensures seamless sliding extraction once the masonry blocks reach self-curing strength.
Acrow Prop Size Ranges
Use this chart to determine the height of each opening. Allow 70mm clearance for the thickness of the rapid head!
Stubbys
For low-set openings and restricted height service paths.
Size #00 Props
For window sills and compact doorway spans.
Size #0 Props
Excellent for mid-level openings and short windows.
Size #1 Props
Standard residential ceiling height window support.
Size #2 Props
Standard residential and commercial doorway heights.
Size #3 Props
For tall commercial garage doors and high structural ceilings.
Size #4 Props
For large industrial portals, wide shopfronts, and heavy masonry.
Engineering Compliance Certifications
Fully certified and compliant with all relevant Australian Building Codes.