OneDek™ is the revolutionary Insulated Metal Panel (IMP) that has insulation and substrate formed at the factory so it arrives on the job site stronger and more secure than components of traditional built-up roof applications. OneDek™ roof panels virtually slide together with tongue-and-groove joinery (RD1) or the lapping edge (RD5). Either roof deck panel requires at least one-third fewer through fasteners, resulting in less time and less labor. And because OneDek™ is a composite, it completely eliminates the step of having to install and fasten roof insulation board. It all adds up to money saved. The top side substrate can be either primed steel or an approved facer depending on the roof covering attachment requirements.