When to check block 28 or 29 of the SF 1442?

Contracting Nerd said:

Hello, I am newer to federal contracting and our agency uses the SF 1442 for awards for construction contracts. I have been trying to research when a CO would check block 28 or block 29 of the back of SF 1442. Any assistance would be greatly appreciated as well as links to policy if any!

Generally speaking Block 28 when a Request for Proposal  is used to solicit pricing and Block 29 when a Invitation for Bids is used.   See Block 2 of the form.  But as it goes it gets complicated from this general view.   Possibly do some futher research on your own such as reviewing FAR subparts 14.408-1 and 15.504 and think about how the SF-1442, while not referenced in these two subparts, would be used rather than the forms noted.   I say this noting that FAR subpart 36.701 provides the imperative to use the 1442 for construction. 

Beyond my thoughts here is a GAO decision that I hope will help refine your reserach and help with undertanding the use of the SF 1442.

  https://www.gao.gov/products/b-235261