Typically, the main thing to keep in mind is that the manufacturer warrants the product and the contractor warrants their workmanship. The manufacturer warrants the shingle and any covered accessories against manufacturing defects. Exactly what is covered and how, will be outlined in the manufacturer’s warranty. Coverage does vary between manufacturers, so it is important to read the warranties. From these basic warranties manufacturer’s also offer enhanced warranty coverage when roofs are installed by their certified installers and a specified scope of work is followed. The actual workmanship is warranted by the roofing contractor, but there are certain enhanced warranty coverages available where the manufacturer also warrants the workmanship. To add a little more confusion, the manufacturers typically also note the labour coverage in their warranties, this means the labour coverage involved to replace the roof in the event of a manufacturing defect. This labour is not the same as the workmanship warranty.