Here the insulation is placed between the inner purlin supported by the truss and the outside metal panel.
Replace insulation in pole barn roof.
One is to remove the panels remove the old insulation and replace it with new insulation.
This will provide a greater r value than r19 batts and provides a vapor barrier.
Closed cell spray foam insulation would need to be added in the area closest to eave sidewalls.
Pole barn or post frame buildings are typically constructed using wood framing with steel roofing and siding.
Steel roofing is a highly conductive material in terms of heat transfer.
When the old panels are removed new larger fasteners are used to put it back together.
The fiberglass insulation used in this method can be as high as r 13 insulation thickness on single layer systems range from r 7 to r 30.
Weighing what you have to start with my recommendation is to spray three inches of closed cell foam insulation below your roof sheathing.
Depending on the type of barn your requirements may vary.
Pole barn insulation thickness one or two inches.
If the insulation has aged like this the roof would benefit from new fasteners.
Insulating a barn roof is very similar to insulating any other kind of building.
Above the roof trusses this choice comes with new construction or a roof replacement.
To repair it there are two primary methods.
In a non insulated pole barn there will be a large amount of heat transferred in and out.
The higher the r value the higher the insulation capacity.
If it is a barn for keeping animals in insulation is much more important.
R values indicate the insulative properties of the material used.