In most industries, receipts and payments are exchanged at the same time. Unfortunately, lien waivers for a construction project aren't quite that simple. A lien waiver is one of many documents provided with a paid app. This means contractors, subs, and suppliers are often required to sign lien waivers before they get paid. Additionally, a lien waiver usually includes more information than services rendered and the amount paid. For these reasons, construction workers need to understand exactly what is disclosed in a lien waiver before signing it.