Opening width
Wide garage spans can require intermediate posts or a system specifically designed for the opening width and expected water load.
Problem Solvers / Global
How can a garage opening be protected from floodwater?
Garage doors are wide, low entry points, but blocking the door alone may not protect the building if water can bypass through walls, side doors or drainage.
Global / overseas search owner Manual project review Exact-system evidence only
Direct answer
The short version.
Measure the garage opening and wall returns, determine the credible water depth and route, assess the slab and drainage, then select a demountable or other barrier strategy that integrates with the wider property flood plan.
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.
Threshold and drainage
Door tracks, slopes and drains can affect sealing. Water trapped on the protected side also needs a management strategy.
Bypass routes
Side doors, vents, wall penetrations and low landscaping can let water around an otherwise effective garage barrier.
Project brief
Information worth collecting before quotation.
01Garage width
02Protection height
03Wall returns
04Threshold
05Door tracks
06Drainage
07Side doors / vents
08Expected flood route
09Barrier storage
Frequently asked
Answers without oversimplifying the project.
Can one barrier protect the whole house?
Only if the garage is the only credible entry route, which should not be assumed.
Do flood barriers make an opening watertight?
Performance and leakage vary by system and installation. Plan for the exact product and wider flood strategy.
Can the barrier be removed after the event?
Demountable systems are designed around temporary deployment while keeping normal access clear.
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.