Find all your unfaced insulation in one place with Johns Manville's Unfaced Insulation Collection! Pick your R-Value for your project and you'll be all set. Johns Manville unfaced batts and rolls effectively control heat flow to the outside and unwanted noise inside. Our rolls are designed for long, unobstructed spaces with 16-in on-center joist spacing and are simple to install, just press in place between joists.