SeaHaven Pontoons

Available as standard or HD.

The SeaHaven is a classic marine pontoon system, available in standard or heavy duty (HD) model, with an enviable reputation for its impressive durability. Our SeaHaven HD Pontoon can be relied upon to provide a safe haven for leisure and commercial crafts in almost any location, specifically designed for exposed and coastal locations.  Our standard pontoon is ideal for inland waterways and less exposed sites.

Our system has evolved over the past 35 years to cope with the demanding conditions of the North Atlantic, instilling confidence and trust in the product by specifiers, designers and users alike. The use of a combination of heavy-duty steel sections in an all-welded construction gives the finished unit superb stability and torsional strength.

Each float is fully interchangeable and filled with polystyrene. Their construction is heavy-duty and rotationally moulded to provide the necessary buoyancy whilst also remaining resistant to impact damage, frost, and long-term decay such as spalling found on concrete floats. Access for repairs and maintenance can be gained simply by removing the decking sections from above. Four securing bolts releases each float for exchange or inspection.

Interconnections are achieved by utilising 4 No. heavy-duty rubber blocks combined with heavy M24 bolts and nyloc threaded nuts. This arrangement gives excellent lateral and vertical movement whist also maintaining high performance in compression and tension. Noise is virtually eliminated.

As a standard, the pontoons are available in the following sizes:

  • Width: 2m, 2.5m or 3m.
  • Length: 7m, 10m or 12m.

Bespoke sizes can be accommodated, and specially strengthened versions are possible where high loadings such as bridge landings and commercial pedestrian traffic are likely.

Simple and elegant service access covers run along both sides of the pontoons providing easy unhindered access to cabling and other services. A specially developed access system allows simplified drop-in deployment of entire cable lengths from above, helping to reduce installation time and cost.


Design Loads

  • 1.5 kN/m2 applied.
  • UDL as standard, higher loadings are available.

Design Guidelines

  • TYHA Code of Practice, 7th Edition & Current ISO Standards for Steelwork.
  • Freeboard: 550mm (nominal unloaded). Adjustable with float configurations.
  • Draft: 380mm (nominal).


  • Completely welded fabrication consisting of channels and hollow structural steel sections.


  • UV stabilised polyethylene floats highly resistant to oil & chemicals.
  • Roto-moulded and filled with solidified polystyrene.
  • Optimal buoyancy trim through selection of; 550mm, 650mm & 750mm depths.


  • Mini-Mesh GRP (standard), Optional: Composite, Softwood/Hardwood or Concrete.


  • Choice of PVC, rubber or timber. A wide range of profiles accommodated.

Corrosion protection

  • All mild steel components hot dip galvanised to BS EN ISO 1461.

Service ducting

  • Full-length removable aluminium covers to both sides.

Mooring cleats

  • Cast aluminium with stainless steel through bolts.
  • Can be changed to meet client requirements.


  • M24 Nut & Bolt with Rubber Block (4 No Per pontoon connection).

Finger attachment

  • Rubber block & bolt. Infinitely variable positioning relative to the pontoon.