The answer to 'roof decking warranty' is that the warranty for roof decking, also known as roof sheathing, can vary depending on the manufacturer and the type of material used. Most plywood or oriented strand board (OSB) roof decking comes with a limited lifetime warranty, which covers the structural integrity of the material for as long as the original homeowner owns the property.
The warranty typically covers issues like delamination, warping, or deterioration of the decking material, as long as it was installed properly and not subjected to water damage or other environmental factors that could compromise the integrity of the decking. Some manufacturers may also offer additional coverage for things like fungal growth or termite damage.