Guide · Alternative
Flexifloat alternative.
Built in Canada.
If you're sourcing Flexifloat S-Series modules, you've already shortlisted the legacy bolted modular systems. Sentinel is the newer pin-flange option — designed to do the same job without the threaded fasteners that 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 fasteners 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 pin-flange connection eliminates the thread. Double-headed pins drop into machined flange sleeves; no threaded fasteners are exposed to immersion. Pull pins to disassemble, even after years in brackish water.
Side-by-side on the things that matter
- Connection: Sentinel pin-flange (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
Direct answers about heavy deck barges, charter terms, and global delivery.
- No. The pin-flange geometry on Sentinel sections won't interchange with Flexifloat's bolted casting hardware. The systems are designed to be fleets unto themselves. If you need to mix-and-match with an existing Flexifloat inventory, stay on Flexifloat. If you're building a new fleet from scratch, the pin-flange system is the modern alternative.
- The most common reasons we hear: (1) tired of the seized-bolt repair cycle on bolted connections after a season in salt water, (2) need stamped Transport Canada engineering for a Canadian project, (3) want a single Canadian 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.