Insulate Tin Roof Without Decking

The problem arises with moisture.

Insulate tin roof without decking.

You can install fiberglass insulation against the metal roof and prevent moisture problems if you cover it with a vapor barrier. In this article we are going to explore both financial and technical aspects when it comes to looking for the best method to insulate the metal roofing. This paper wrap is important to the health of the home by not allowing water to build up in the space between the sheathing and the metal roof. The moisture is held in place by the insulation which allows for damage to the framing and other building components.

In warm climates zones 1 through 4 low density open cell spray foam insulation is the typical choice since it is vapor permeable and will allow drying of the exterior sheathing and roof framing if they happen to get wet via diffusion into the interior of the building. It is possible to insulate from below as you suggest with rigid polystyrene insulation. First nail 1x2s to the rafter sides up against the roof strapping. T he problem with the insulation against the sheathing expands.

Lay insulation on paper liner one of the most common mistakes that diy homeowners make with their metal roof is that they do not lay down any type of paper wrap on the sheathing. If there is a roof leak the insulation will be damaged by the water leaving you with less insulating value. Some homeowners choose to use unfaced fiberglass insulation batts.