Roof
The most common way to insulate the roof of a pole building is to place the insulation blankets at the bottom of the truss. This is typically done by placing metal banding 30” apart down the length of the building. Another common method is to install a metal liner panel (similar to wall and roof panels) at the bottom of the rafters. In both cases the insulation blankets are laid over the top of the banding or liner panel between the rafters. If steel liner panel is used the insulation can be unfaced. If steel bands are used, a vinyl facing is used as a vapor barrier and for a finished look. A second method is to install following the roof pitch. If you use wide blankets and install from the peak to the eave, banding can be applied. Any blanket thickness can be used, however, an airspace may be created between the roof panel and insulation creating condensation. Another method is to install the blankets typically between the roof purlins supported with banding. The blanket thickness is usually determined and limited by the depth of the roof purlins. For High R-Values (up to R-49) both methods can be combined.
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