But here we are - Garland does.
See the MRCA Article on the Garland "30-year warranty" at:
http://http://roofingscam.blogspot.com/2008_03_02_archive.html#733669647137747897
See the actual warranty from a 2001 document reprinted here below:
Note in the next to the last paragraph of the second page (just above) the following "verbage" for the "30-year warranty":
"Inspection Requirements
Owner must request in writing an inspection of the roof at any time between the sixth and tenth month of each fifth-year starting with year 15 (15, 20, 25) of this warranty's duration. Upon receipt of such request, Garland will provide an inspection of the roofing system by a Garland representative to determine whether any repairs are required to make the system eligible for the continuation of this warranty, submitting a detailed inspection report to owner outlining the nature and extent of such required repairs such as repairs to physical damage, debris removal, drainage clearance, pitch box, coping metal edge and reglet seals and flashing reflectivity."
With the use of non-involved third-party Roof consultants from the RCI, you have a much better chance of getting only needed repairs done at any point, and with a real warranty, you don't have to repair to continue the warranty.