Measure the opening
Take width at the top, middle and bottom, record the opening height and identify whether the jambs are parallel, plumb and structurally suitable.
Technical & Specifier Centre / Global
How to measure an opening for a flood barrier.
A flood barrier needs accurate geometry and a credible supporting interface. Width alone is not enough.
Global / overseas search owner Manual project review Exact-system evidence only
Direct answer
The short version.
Record the clear opening width at multiple heights, the required protection height, reveal depth, wall and threshold construction, any obstructions, floor falls and the route that displaced or leaked water could take.
Project decision
What matters before product selection.
Use these points to structure the first project conversation. Final suitability stays tied to the actual site, selected system and local project team.
Record the threshold
Floor levels, ramps, drainage channels, door tracks and uneven thresholds affect sealing and deployment.
Look beyond the opening
Protection can be bypassed through adjacent walls, vents, drainage or another lower entry point. The opening is one part of the wider flood pathway.
Project brief
Information worth collecting before quotation.
01Top / mid / bottom width
02Protection height
03Reveal depth
04Jamb construction
05Threshold construction
06Floor falls
07Nearby vents / openings
08Photos with scale
09Deployment access
Frequently asked
Answers without oversimplifying the project.
Is one width measurement enough?
No. Openings can be tapered or out of square, so record several measurements.
Can a barrier seal against any wall?
No. The supporting surface and fixing method need to suit the selected barrier.
Should I measure expected flood depth?
Yes, if credible local flood information is available. Barrier height should be considered with the wider site flood strategy.
Next step
Turn the research into a real project brief.
Send the site, dimensions, intended use, quantities and known local requirements. Apollo will review the relevant product pathway and keep local engineering, approvals and site-work responsibilities explicit.