Fiberglass Structural Fabrication and Repair
Custom fiberglass fabrication and structural repair for decks, stringers, transoms, and hardtops that have suffered rot, impact, or delamination damage. We rebuild using industry-approved materials to restore original strength and rigidity.
Soft spots in the deck, a spongy transom, or visible delamination are signs the structure underneath has failed. Left alone, the damage spreads and repair costs climb.
Common problems we fix
- Soft or spongy spots in the deck — Water finds its way through worn hardware bedding or deck cracks and soaks the wood core beneath the fiberglass skin. The fix requires cutting out the affected laminate, replacing the saturated core, and glassing the surface back to original spec.
- Transom feels soft or flexes at the motor — Transoms typically use a plywood core that absorbs water over years of exposure. A compromised transom cannot safely hold the motor. We remove the old core, dry the cavity, and rebuild with rot-resistant materials.
- Stringers cracked or separating from the hull — Stringers take the load from engines, passengers, and rough water. When they crack or delaminate, the whole deck structure loses rigidity. We grind back to solid laminate and re-bond or replace the affected section.
- Hardtop cracked after impact or stress — Cracks in a fiberglass hardtop are not just cosmetic. They can spread and compromise the mount points for electronics and antennas. We assess whether the damage is surface-only or structural before fabricating a repair.
How We Assess Structural Damage
We start by tapping the suspect areas. A hollow sound versus a solid thud tells us where the core has separated. We follow that with a close inspection of hardware penetrations, seams, and any visible cracking in the gelcoat. The tap test alone can map out damage that is not visible from the surface. That tells us how much material needs to come out before we can start rebuilding.
Why Southwest Florida Hulls Rot Faster
The combination of heat, humidity, and salt air here accelerates the breakdown of bedding compounds around deck hardware. Once a fitting starts to weep water, the core absorbs moisture quickly in the summer heat. Boats that sit in the water full-time or are stored uncovered between seasons are especially vulnerable. Annual inspection of hardware bedding is the most effective way to catch intrusion early.
- Check all through-deck fittings for soft bedding or hairline gelcoat cracks
- Look for rust stains around fasteners, which signal a wet core
- Press firmly on deck areas near the transom and around the console base
Repair vs. Full Replacement
Not every structural problem means rebuilding the whole section. A stringer crack confined to one bay can often be glassed in place. A transom that has been saturated top to bottom needs a full replacement. The difference usually comes down to how far the moisture has traveled and whether the laminate around the damage is still well bonded. We only remove what has actually failed.
Materials Used in Structural Rebuilds
Core material choice matters for longevity. Closed-cell foam and composite cores resist moisture far better than traditional plywood in marine environments. For structural laminates, fiberglass cloth weight and layup schedule are matched to the original construction. Some applications call for biaxial cloth for added stiffness.
- Closed-cell foam core for decks and transoms
- Biaxial fiberglass cloth for high-load structural areas
- Marine-grade epoxy or vinylester resin depending on the application
How do I know if my transom needs to be replaced or just repaired?
Can you match the original gelcoat color after a structural repair?
Is it safe to keep using the boat if I notice a soft spot?
What causes delamination in fiberglass?
Related services
Fiberglass Hull Repair
Professional fiberglass repair and restoration for cracked, delaminated, or damaged boat hulls. We restore structural integrity and finish to manufacturer standards, protecting your vessel from water intrusion and further damage.
Learn moreMarine Engine Repair & Rebuilding
Comprehensive inboard and outboard marine engine diagnostics, repair, and rebuilding services for all major brands. We restore lost power, resolve overheating issues, and get your engine running at peak performance.
Learn moreOutboard Motor Service
Full-service maintenance and repair for outboard motors including tune-ups, fuel system cleaning, impeller replacement, and lower unit rebuilds. Keep your outboard running reliably season after season.
Learn moreBook your structural fiberglass fabrication today
Fast response, upfront pricing, satisfaction guaranteed.