The three things that get called testing
Structural analysis is finite element modelling — a computer model of the system under hydrostatic load. It is common, it is legitimate, and it is not a physical test of anything. Material testing is an independent laboratory cutting a coupon from real production product and running chemistry and tensile tests. It tells you the metal is what the brochure says. System certification is a certifying body physically testing a complete assembly against a published standard and witnessing the result. When a company says “tested,” it is worth asking which of the three they mean.
ANSI/FM 2510
The only US standard that physically water-tests flood abatement equipment. Published by FM Approvals. Design depth is the barrier’s rated head or three feet, whichever is lower. Several commercial and industrial manufacturers hold it, and one flexible water-weighted product was tested at the US Army Corps of Engineers research centre in Vicksburg. If someone selling residential aluminium panels tells you their panels are FM certified, ask for the certificate number and check it against FM’s own approval guide.
- Watertightness at stated increments of design capacity, each hydrostatic stage held 22 hours or more
- Stability under load, wave resistance, salt spray, and load cycling
- Debris impact — 500 lb and 750 lb logs at 7 feet per second
- All of it witnessed by the certifying body
No manufacturer of removable aluminium panel systems sold to Florida homeowners holds ANSI/FM 2510, ourselves included.
BS 851188 and USACE Type 2
BS 851188 is the British standard, with the most quotable number: 500 millilitres per hour per metre of product length. Several imported products reference it. USACE EP 1165-2-314 Type 2 is expressed as 0.01 gallons per minute per linear foot of wetted perimeter. Leakage above that is treated as an indication the barrier is not functioning properly.
Maximum permitted leakage, normalised
| Standard | As published | Normalised (L/h/m) |
|---|
| BS 851188 | 500 mL/h per metre | 0.50 |
| ANSI/FM 2510, opening barriers | 0.08 gal/hr per linear foot | 0.99 |
| USACE EP 1165-2-314 Type 2 | 0.01 gal/min per linear foot | 7.45 |
They are not the same number. Every standard is a maximum permitted leakage rate, not zero.
Every flood barrier leaks a little
There is no removable flood barrier that keeps a building perfectly dry. The published standards do not require it, the honest manufacturers do not claim it, and physics does not permit it. Water also arrives by routes no barrier addresses — floor drains, plumbing, weep holes, and through the slab itself as the water table rises. What a good barrier does is reduce the volume from catastrophic to something a pump and a wet vacuum can handle. Plan for a pump. Every serious deployment guide in this industry says so.
Florida Product Approval and Miami-Dade NOA
Both are wind and impact schemes. They test against TAS 201, 202 and 203. TAS 203 does include water spray during pressure cycling, which is occasionally presented as water testing. It is testing whether wind-driven rain penetrates an assembly, not whether a barrier holds back standing water. If a flood product is offered to you with an approval number, ask which product in that company’s range the number belongs to.
What we hold, and what we do not
We had an independent laboratory run chemistry and tensile testing on production plank and post samples, and our structural analysis was carried out by an outside engineering firm using finite element modelling. We describe that as independently tested. We do not describe it as certified, because material verification on sampled product is not a system certification. We do not hold ANSI/FM 2510. We do not hold a Florida Product Approval or a Miami-Dade NOA for flood, and neither does anyone else selling removable aluminium panels to Florida homeowners.
