573.15  Exception.
  No part of the unpaid fund due the contractor shall be retained as provided in this chapter on claims for material furnished, other than materials ordered by the general contractor or the general contractor’s authorized agent, unless such claims are supported by a certified statement that the general contractor had been notified within thirty days after the materials are furnished or by itemized invoices rendered to contractor during the progress of the work, of the amount, kind, and value of the material furnished for use upon the said public improvement, and no part of such unpaid fund due the contractor shall be retained as provided in this chapter because of the commencement of any action by the contractor against the state department of transportation under authority granted in section 613.11.
[C31, 35, §10312-d1; C39, §10312.1; C46, 50, 54, 58, 62, 66, 71, 73, 75, 77, 79, 81, §573.15]