Structural Steel Galvanization Requirements

[drewpe]

I am working on a project where I have structural steel that was not galvanized but is not entirely enclosed by the building envelope. The following are the two conditions:

1) Entrance columns exterior to the main building envelope supporting architectural precast panels. These columns are surrounding by these architectural precast panels on four sides, however they do not have interior cold form stud walls to help insulate them, just the airspace between the column and the precast wall panels. Does this need to painted to protect it from corrosion (since it has already been erected and cannot be galvanized) or is the shop primer enough?

2) Some of the header support channels for headers that are in the plane of the wall, offset from the column center line, extend past the face of the wall and water barrier into the air gap between the wall and the exterior brick. Do these need to be painted as well or is the shop primer adequate? I am leaning towards these being painted, however I wanted to see if anyone else could shed some light/insight on steel protection requirements/typical practices.

Again this steel has already been erected, so any corrosion protection would have to be done in the field and not in the shop.

Thanks in advance for any help you can give.

 

[phamENG]

When the building is in service, is it easily accessible for inspection and, if needed, cleaning and repainting? If the answer is no, then you should have a paint system applied now that can stand up to exterior use. If the answer is yes, then the paint would still be a good idea, but not as critical as long as there's somebody around to pay attention and address issues when the arise. If you choose not to paint it, make sure any nicks or damage to the shop prime get touched up.

I'm not familiar with Nebraska's weather/climate. You're obviously not near the ocean, so you have that going for you. How's your RH? If it's relatively dry, then that's also a plus.

 

[johnie134]

AISC Specification - A572