×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Painting exterior steel not exposed to weather - is paint required

Painting exterior steel not exposed to weather - is paint required

Painting exterior steel not exposed to weather - is paint required

(OP)
We are designing structure (apartment building) that has on-grade parking, a steel-framed floor above the parking level and several floors of wood-framed residential construction above. The steel framing is in the ceiling of the parking level. The parking level is open on all sides and unheated. The steel will will be spray-fireproofed. Does the steel need to be painted? Will the spray fireproofing provide any protection to the steel? We would like to avoid painting the steel if possible. Thanks for any insight anyone can share.

RE: Painting exterior steel not exposed to weather - is paint required

Unpainted. "Paint may weaken the adhesion of spray-fireproofing".

At least that is what I have gathered from a simple Google search.

I'm not sure how clean the surface needs to be, but I would think you do not want any rust, grease or oil.

"Research is what I'm doing when I don't know what I'm doing."

RE: Painting exterior steel not exposed to weather - is paint required

You do not paint steel that is to have sprayed on fireproofing applied. Without looking into it I do not know if you can leave fireproofing exposed to the elements.

RE: Painting exterior steel not exposed to weather - is paint required

Fireproofing spray doesn't provide corrosion protection. In fact it can help corrosion by absorbing moisture and keeping it. Some primers are pretested for bonding with fire spray. You can check with UL and specify that type of paint. Otherwise, you need to ask for bond tests to satisfy the code requirements. If bond is not achieved, you might need to achieving it mechanically. I echo the concern of leaving the fire spray exposed.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources