What is the warranty on the Siniat system, and what are the conditions? All warranties and certification issued under Knauf will still be valid under the Siniat brand. Please download the full Siniat warranty document here. Post navigationPrevious post: I’m interested in James Hardie cladding – but I’m not sure which finish is right for my job.Next post: Can I request a quote through the PlastaMasta Southern Sydney website? How does it work?