573.6  Subcontractors on public improvements.
  The following provisions shall be held to be a part of every bond given for the performance of a contract for the construction of a public improvement, whether said provisions be inserted in such bond or not, to wit:
  1.  The principal and sureties on this bond hereby agree to pay to all persons, firms, or corporations having contracts directly with the principal or with subcontractors, all just claims due them for labor performed or materials furnished, in the performance of the contract on account of which this bond is given, when the same are not satisfied out of the portion of the contract price which the public corporation is required to retain until completion of the public improvement, but the principal and sureties shall not be liable to said persons, firms, or corporations unless the claims of said claimants against said portion of the contract price shall have been established as provided by law.
  2.  Every surety on this bond shall be deemed and held, any contract to the contrary notwithstanding, to consent without notice:
  a.  To any extension of time to the contractor in which to perform the contract.
  b.  To any change in the plans, specifications, or contract, when such change does not involve an increase of more than twenty percent of the total contract price, and shall then be released only as to such excess increase.
  c.  That no provision of this bond or of any other contract shall be valid which limits to less than one year from the time of the acceptance of the work the right to sue on this bond for defects in the quality of the work or material not discovered or known to the obligee at the time such work was accepted.
[S13, §1527-s18; C24, 27, 31, 35, 39, §10304; C46, 50, 54, 58, 62, 66, 71, 73, 75, 77, 79, 81, §573.6]
Referred to in §573.7