2020 Roof Deck Cost: Estimate Deck Prices Per Square Foot | RoofCalc.org
On average, 300 sq.ft. of roof decking costs $800-2,800 to install, depending on the material you choose. Unfortunately, many homeowners who have a flat deck roof have to deal with frequent leaks. This is usually because low quality, leak prone decking materials, such as EPDM rubber are used, often in an effort to save money.