The Act makes null, void, and unenforceable any waiver of a right to claim a lien in advance of furnishing labor, services, or materials. Further, any lien waiver executed after commencement of a project, whether to induce a progress payment or final payment, must substantially follow the forms set forth in the Act. Within thirty days after entering into a lien waiver conditional on payment, an unpaid contractor must file an Affidavit of Nonpayment or else such amounts owed shall be deemed paid in full and the condition of payment satisfied.
King, Daniel R.
"PROPERTY Mortgages, Liens, and Security: Provide Restrictions and Forms for Lien Waivers and Release,"
Georgia State University Law Review:
1, Article 9.
Available at: http://readingroom.law.gsu.edu/gsulr/vol8/iss1/9