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Aluminum or Stainless for swim platform on Houseboat ?

I have a houseboat that is moored in a Fresh-water lake. I want to have a 15' x 10' swim platform fabricated for the back of the boat. This platform is at water level. My question is Aluminum or Stainless for the frame? And which alloy is best? My concern is corrosion resistance. Frame will most likely be square tubing. Weight is not a concern. Fasteners used to secure decking material (Trex) to Frame will be Stainless Steel (I assume, unless told to use something else). Thank-you!

Neil Robertson
hobbyist - Fresno, California, USA
2003

Prevailing opinion among boaters and the boating industry appears to be that, if you ignore cost, stainless steel is better, period.

Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
2003

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