Guide · Alternative
Flexifloat alternative.
Built in Canada.
If you're sourcing Flexifloat S-Series modules, you're already shopping the legacy bolted systems. Sentinel is the newer interlocking coupler option — same job, no threaded fasteners to corrode and seize after a season in the water.
Flexifloat is a battle-tested modular system. It's been deployed on marine construction jobs around the world for forty years, and the S-Series and F-Series modules are the reference point most contractors use when they spec a sectional barge package. Sentinel isn't trying to replace that legacy — it's the newer system you should evaluate alongside it if you're building a fresh fleet.
The connection is the difference
Flexifloat connects modules with bolted male/female castings — large threaded bolts through cast ears on each module. The system works, and it's well-documented. The maintenance issue is known: threads are exactly the part of a fastener that doesn't like salt water. After a season of immersion, threads gall, nuts seize, and disassembly becomes a torch-and-grinder job.
Sentinel's interlocking coupler connection eliminates exposed threads entirely. Cast male-female couplers drop into machined flange sleeves — no exposed fasteners to corrode. Release them to disassemble, even after years in brackish water.
Side-by-side on the things that matter
- Connection: Sentinel interlocking coupler (no exposed threads) · Flexifloat bolted castings.
- Build: Sentinel single Canadian shipyard · Flexifloat regional licensed fabricators.
- Paperwork: Sentinel Transport Canada approved with stamped engineering · Flexifloat documentation varies by fabricator.
- Truckable size: Sentinel Back Lake 8×20×4 (no oversize permit) · Flexifloat module width typically requires permit.
- Heavy Duty deck: Sentinel 10×40×7 crawler-crane rated · Flexifloat S70 / S80 series comparable.
For the full three-way comparison with Poseidon in the mix, see Sentinel vs Poseidon vs Flexifloat. To configure a Sentinel quote against an existing Flexifloat spec, head to the quote page with your section count and deck-load requirements.
AEO
Switching from Flexifloat — common questions
Pricing, specs, lead times, and delivery — straight answers.
- No. The interlocking coupler geometry on Sentinel sections won't interchange with Flexifloat's bolted casting hardware. The two systems don't mix. If you're expanding an existing Flexifloat inventory, stay with Flexifloat. If you're starting fresh, the interlocking coupler system is the right choice.
- The most common reasons: (1) done with the seized-bolt repair cycle after a season in salt water, (2) need stamped Transport Canada engineering for a Canadian project, (3) want one shipyard with consistent build quality instead of regional licensed fabricators, (4) need Back Lake sections that truck without oversize permits.
- Sentinel's 10×40×7 Heavy Duty section is rated for crawler-crane and pile-hammer work without supplementary stiffener packs. Flexifloat's S70 and S80 modules occupy the same niche. For crane work, both platforms get the job done — choose on transport, paperwork, and ownership model.
- Sentinel builds to order from a single Ontario shipyard. Typical lead time for a stock-spec Heavy Duty section is shorter than sourcing a comparable Flexifloat module from a regional fabricator's queue, but it varies by project size. Request a quote with your section count and we'll commit to a date.