Fasteners in coastal region
Fasteners in coastal region
(OP)
The project in question is located on the Gulf coast, roughly 50 feet or so from the water. In addition to the main structure, we will be adding a boardwalk, gazebo, dune crossover and the like. Would galvanized fasteners or SS fasteners be better in this situation? What type of SS would we use? I know of 304 and 316 as being common structural fasteners. Cost is not a concern. Let's assume that we will be using bolts, nails and/or screws. The design has not been determined yet. I'm just trying to get a handle on fasteners before getting into the actual design.





RE: Fasteners in coastal region
Zinc and aluminum have similar reactivities. Galvanised members adjacent to stainless steel can have local corrosion isues unless electrically isolated by neoprene washers(or similar).
RE: Fasteners in coastal region
http://www.ssina.com/publications/fasten.html
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RE: Fasteners in coastal region
RE: Fasteners in coastal region
RE: Fasteners in coastal region
csd
RE: Fasteners in coastal region
If you can, run all of the screws from the bottom, not the top or sides. This way salt water will not collect and have a chance to concentrate on the fasteners. I know that this is a pain, but I have built decks where we made sections 'upside down' then installed them in order to do this. It looks better too.
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Plymouth Tube
RE: Fasteners in coastal region
RE: Fasteners in coastal region
RE: Fasteners in coastal region
The stainless steel will accelerate the corosion of the much more active zinc. We combine these two materials a fair bit but we are careful to specify neoprene washers (or similar) to minimise electrical contact.