In plain English
FAR 52.222-5, Construction Wage Rate Requirements-Secondary Site of the Work, is a solicitation provision prescribed at FAR 22.407(h), most recently dated May 2014. The complete official text is reproduced below, verbatim, from GSA's published FAR source files.
Its text contains no sentence requiring insertion into subcontracts; see the flowdown section below for what that does and does not mean.
Does it flow down to subcontracts?
No flowdown mandate found in the clause text
This is a solicitation provision — it applies to offerors when submitting an offer, not to contract performance, so subcontract flowdown is generally not the operative question for it.
Where it's prescribed
As prescribed in 22.407(h), insert the following provision:
Prescribing reference: FAR 22.407(h).
The official text, verbatim
As prescribed in 22.407(h), insert the following provision:
Construction Wage Rate Requirements-Secondary Site of the Work (May 2014)
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(a)
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(1) The offeror shall notify the Government if the offeror intends to perform work at any secondary site of the work, as defined in paragraph (a)(1)(ii) of the FAR clause at 52.222-6, Construction Wage Rate Requirements, of this solicitation.
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(2) If the offeror is unsure if a planned work site satisfies the criteria for a secondary site of the work, the offeror shall request a determination from the Contracting Officer.
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(b)
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(1) If the wage determination provided by the Government for work at the primary site of the work is not applicable to the secondary site of the work, the offeror shall request a wage determination from the Contracting Officer.
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(2) The due date for receipt of offers will not be extended as a result of an offeror’s request for a wage determination for a secondary site of the work.
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(End of provision)