Iowa Code § 572.33A
1. An owner of a building, land, or improvement upon which a mechanic’s lien of a subcontractor may be posted is not required to pay the general contractor compensation for work done or material furnished for the building, land, or improvement until the expiration of ninety days after the completion of the building or improvement unless the general contractor furnishes to the owner one of the following:
2012 Acts, ch 1105, §24, 27, 28; 2013 Acts, ch 99, §16; 2014 Acts, ch 1092, §128