Every flat roof is only as strong as the deck beneath it. This guide explains how deck preparation works during a flat roof installation in Edmonton, whether the deck is steel, concrete or wood. Learn why the deck must be clean, dry, sound and properly fastened, and why rotted or corroded sections must be replaced during tear-off. Covering a damaged deck with a new roof is one of the most expensive mistakes building owners make, and this guide shows you how to avoid it.