How to Measure for a Glass Balustrade
This step-by-step measuring guide explains how to set out the centre line, measure the run correctly, account for overhangs and allow for tolerances before ordering a glass balustrade system.
Tools Required
Before measuring for a glass balustrade, make sure you have the correct tools ready.
- Measuring tape
- Pencil or marker
- Straight edge or chalk line
Step 1: Set back from the edge
All centre lines should be set back 75mm from the substrate edge. This creates a consistent fixing line for channels or post fixings.
- Measure 75mm in from the edge of the substrate.
- Mark the centre line clearly.
- Keep the same offset along the full length of the run.
Step 2: Measure the run
Measure the full run accurately and mark the centre line for each section. This will guide the position of your bottom channel and post fixings.
- Use a measuring tape to record the full run length.
- Mark each straight section clearly.
- Repeat the process for each additional run if the layout changes direction.
Step 3: Account for overhangs
If the substrate has an overhang, measure at least 75mm perpendicular from the point where the overhang begins. This helps ensure the fixing line lands in a solid substrate suitable for bolt fixings.
- Identify where the overhang starts.
- Measure inward to a solid fixing zone.
- Confirm the intended fixing line remains structurally suitable.
Step 4: Allow for tolerance
Leave a 25mm gap from the end of the channel or end post to the end of the measured run. This provides adjustment tolerance and allows proper water run-off.
- Measure the full run.
- Allow 25mm clearance at the end position.
- Confirm the final measurement before ordering materials.
Final Check Before Ordering
Before drilling or fixing, make sure all measurements are accurate and the fixing area is suitable.
- Recheck all measurements
- Confirm the centre line is straight and correctly offset
- Ensure the substrate is solid and suitable for fixing bolts
Related Technical Support
For more help planning your project, see our related guides below.
Frameless Glass Installation Guide
Post & Glass Installation Guide
Balustrade Building Regulations
Glass Thickness Guide for Balustrades
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