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How to Measure Finished Floor Level (FFL)
Finished Floor Level (FFL) is the height you want the top surface of your paving or decking to sit at once everything is installed.
To measure FFL:
- Start with your target level — usually aligned with a door threshold, internal floor, or step edge.
- Measure from the subfloor (the surface the pedestals will sit on — often a membrane, insulation board, or concrete slab) up to that target height.
- Take measurements at multiple points, especially at corners and edges.
Why the slope?
Most external areas are designed with a slope, called a fall, to allow water to drain properly. In the UK, the typical minimum fall is 1:100 (10mm per metre), but we regularly see steeper gradients of 1:80, 1:40, and even 1:20 on projects with more demanding drainage needs.
These changes in level are completely normal. Just record and share your measurements and we’ll recommend the right adjustable pedestal system to match.
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