Marine grade balconies and materials

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Coastal equals corrosive

Coastline homes and apartments with sea views are the most expensive properties around. The intriguing lure of the ocean and seas have a special effect on us human beings.

Full height glass doors and windows are one way to enjoy this view but an external balcony overlooking the sea has been since the time of ancient Rome and Greece a pleasant amenity to enjoy life.

A hostile environment

Rust on fixings use on balconies

Together with its immense and overwhelming beauty the sea brings with it one of the most hostile environments to building materials that exists. Designers, builders and architects must consider which material to specify in these areas so that they do not corrode, rot or crumble away with these harsh conditions.

Exposed concrete, unprotected metal, untreated wood and many more unsuitable materials will experience a very short life span in the coastal environment. The combination of salt, humidity and wind will eat away at unprepared materials. There is no getting around this or taking it lightly, we have seen screws and bolts disintegrate to a dusty red powder and disappear literally into thin air. You would not want this type of bolt holding any part of the structure or anything of importance in this kind of environment.

When designing a balcony structure, a balustrade or glass railing in this sort of environment there are some basics one must never fail to follow.

Choosing the right metal

Anodised Aluminium used for balconies by the coast

When choosing a metal to use as part of the balcony structure, the handrail or the retaining bottom rail, posts etc., it is essential to understand the corrosion resistance of each of these materials in relation to its function and position within the building envelope.

Stainless steel - Materials such as 316 (marine grade) stainless steel and anodised aluminium have very good corrosion resistance. Most types, but in particular lower grade stainless steel will “tea stain” and the only way t avoid this is to use a highly polished type and /or clean it regularly with a special cleaner that removes these superficial deposits. It is important to note that the tea staining on stainless steel is superficial and it will not corrode or compromise its structural integrity. 

Anodised aluminium - Anodised aluminium is very corrosion resistant and is the preferred material in buildings today. Used for external curtain walls, doors and windows and certainly for Balustrades, fascias and balconies the aluminium market has overtaken all other materials in this respect.

Using anything that is lower in grade than these two materials will result in the material requiring replacement in a short time and will out-weigh and initial saving on material type. It is therefore not recommended to use anything less than anodised aluminium or marine grade stainless steel.

Choosing the correct fixings

You may think that because the fixing sits embedded in concrete or another material then it is not exposed to the elements or corrosive salt air. You will be mistaken and fixing in a coastal environment must be stainless steel, preferably A4 (again marine grade, A4 is the reference when dealing with fixings but is in essence the same as 316). A2 fixings will work and if not visible will be jast as fine usually. The difference in cost is not huge and A4 will always be a safer bet.

A glass protection coating

Balconano Self-Cleaning coating kit

This is a new field, not widely known or used yet but not to be underestimated. Glass is a very durable material but glass is NOT immune to corrosion or contamination. The life of glass, or to be more specific, the clear life of glass depends very much on its surface condition.

Have you ever wondered why glass gets more opaque as time goes by? Well dirt, salt, calcium, bacteria, grime and many more elements get deposited in the microscopic pits in the face of glass. Marine conditions put glass through a rough life of constant abrasion with salty and sandy air which slowly but surely deteriorates the face and surface of the glass losing it its shine and clarity.

Recent advances in Nano technology and chemistry have allowed new glass coatings to become available, these coatings form a hard silica based protective layer to form on the face of the glass creating a water repellent surface which is more resistant to the elements and does not allow these materials to get deposited in the surface of the glass. It is strongly recommended to choose a good strong glass coating for any glass panels that are in a coastal environment. For more on this type of coating please go to

Choose sensibly, save money

The age old saying that cheap is expensive remains true here. Choosing the right material, one that has the correct surface protection and attributes, in a marine or coastal environment, can not only make the difference between success and failure of a structure but will also save you grief and money in the longer run.


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