Corrosion of galvanized plates
Corrosion of galvanized plates
(OP)
Two part question.
First, Is there a relatively easy way of stopping corrosion on a metal truss plate? I have wood roof trusses in a building on the beach and the salt air has begun corroding the metal plates within just a few years. I could attach plywood gussets over the plates but this would be quite extensive. I'd rather paint them with a zinc rich paint or something of that nature. Can anyone direct me to a manufacturer that could help me out with this?
Second, does it make sense to use stainless steel nails in a galvanized uplift connector? I'm looking for an argument to support that.
First, Is there a relatively easy way of stopping corrosion on a metal truss plate? I have wood roof trusses in a building on the beach and the salt air has begun corroding the metal plates within just a few years. I could attach plywood gussets over the plates but this would be quite extensive. I'd rather paint them with a zinc rich paint or something of that nature. Can anyone direct me to a manufacturer that could help me out with this?
Second, does it make sense to use stainless steel nails in a galvanized uplift connector? I'm looking for an argument to support that.






RE: Corrosion of galvanized plates
Truss plates are rather thin to begin with, so if they're rusted, your only safe alternative would be plywood gussets.
RE: Corrosion of galvanized plates
RE: Corrosion of galvanized plates
I put a disclaimer on my plans that the structural systems must be maintained by owner for the system to continue to function properly, and that includes periodic maintenance of various sorts.
If the plates are showing signs or corrosion, consider cleaning in them good and covering them with good cold zinc paint/primer.
RE: Corrosion of galvanized plates
How about the second part to my post, justification of stainless steel nails in a galvanized hardware?
RE: Corrosion of galvanized plates
For corrosion resistant finishes:
Hot dip galvanided (ASTM A 153) use hot-dip fastener. No galvanic cell between metals.
Stainless Steel (316) use stainless steel fastener. No galvanic cell between metals.
316 SST connector plates should also be used with new treated lumber, coastal zone, indoor swimming pool or corrosive chemical areas.
RE: Corrosion of galvanized plates
RE: Corrosion of galvanized plates
Thanks. Is there anything (Code, Text) I could reference to show this?
Drew
RE: Corrosion of galvanized plates
These are based on research done by some Transportation departments (one of them being Maryland, I believe) on storage facilities for road salt.
I think these would be more effective than the plywood. Unless of course you need the plywood gussets to make up for corrosion losses.
RE: Corrosion of galvanized plates