735 ILCS 5/8-1801: Presumptive proof.

Any work or service on real property or any product incorporated therein to become part of such real property which does not cause injury or property damage within 6 years after such performance, manufacture, assembly, engineering or design, shall be presumptive proof that such work, service or product was performed, manufactured, assembled, engineered or designed with reasonable care by every person doing any of such acts. However, all written guarantees are excluded from this Section.