In plain English
FAR 52.246-13, Inspection-Dismantling, Demolition, or Removal of Improvements, is a contract clause prescribed at FAR 46.313, most recently dated Aug 1996. 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
We scanned the full clause text and found no sentence directing the contractor to insert this clause into subcontracts. That is a statement about the text, not legal advice: a prime contractor may still flow terms down contractually, an agency supplement (DFARS, VAAR, …) may add requirements, and clauses listed below (if any) may order this clause into subcontracts from the outside.
Where it's prescribed
As prescribed in 46.313 , insert the following clause in solicitations and contracts for dismantling, demolition, or removal of improvements:
Prescribing reference: FAR 46.313.
The official text, verbatim
As prescribed in 46.313 , insert the following clause in solicitations and contracts for dismantling, demolition, or removal of improvements:
Inspection-Dismantling, Demolition, or Removal of Improvements (Aug 1996)
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(a) Unless otherwise designated by the specifications, all workmanship performed under the contract is subject to Government inspection at all times and places where dismantling or demolition work is being performed. The Contractor shall furnish promptly, and at no increase in contract price, all reasonable facilities, labor, and materials necessary for safe and convenient inspection by the Government. The Government shall perform inspections in a manner that will not unduly delay the work.
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(b) The Contractor is responsible for damage to property caused by defective workmanship. The Contractor shall promptly segregate and remove from the premises any unsatisfactory facilities, materials, and equipment used in contract performance, and promptly replace them with satisfactory items. If the Contractor fails to proceed at once in a workmanlike manner with performance of the work or with the correction of defective workmanship, the Government may-
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(1) By contract or otherwise, replace the facilities, materials, and equipment or correct the workmanship and charge the cost to the Contractor; and
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(2) Terminate for default the Contractor’s right to proceed. The Contractor and any surety shall be liable, to the extent specified in the contract for any damage or cost of repair or replacement.
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(End of clause)