insulation thickness and r-value: use the schedule, not memory insulation, liner, vapor barrier & condensation duct insulation thickness r value schedule supply return outside air read the insulation schedule for the duct service, location, temperature, and exposure, then confirm the installed product provides the specified thickness and thermal value. wrong insulation can cause condensation, energy loss, failed inspection, and expensive replacement after ceilings close. project insulation schedule, energy requirements, approved insulation submittal what insulation type and thickness does the schedule require for this duct service and location?