Weatherproofing exposed fasteners

What are the best weatherproofing strategies for exposed fasteners?

What are the best weatherproofing strategies for exposed fasteners?

Opt for fasteners made from materials that are inherently resistant to corrosion, such as stainless steel, aluminum, or other corrosion-resistant alloys.
 

According to AEP Span:

We recommend purchasing your fasteners from the manufacturer. In addition, we recommend using fasteners with a neoprene washer. It is always recommended to ensure fasteners are attached as per the manufacturer’s guidance. Over or under tightened fasteners can be a source of water infiltration.