Notes: To obtain the best performance with Prodex installed in Locations 1, 2, 4, and 5, Prodex should also be installed over the gable ends. For attics that are open to the space over garages or carports, Prodex should extend eight feet or more into the garage or carport to achieve the same effect as installing Prodex on the gable ends. It is not necessary to cover the gable ends in Location 5..
Since proper attic venting is important to obtain the best radiant barrier performance, some modification in the attic vents may be required. If no ridge or gable vent exist, it is recommended that one or the other be installed. Always check existing ridge vent systems to ensure that roofing paper is not blocking the vent opening. Check soffit vents to ensure that they have not been covered with insulation..
When installing Prodex, care should be taken not to compress existing insulation present in the attic. The effectiveness of the existing insulation is dependent upon its thickness, so if compressed its R-value decreases. For instance, an R-19 batt compressed to 3-1/2 inches (to top off a 2 x 4 attic floor joists) would reduce to approximately an R-13 batt.
Disclaimer: The installation instructions are only recommendations relating to the locations of Prodex. Insulation4Less/Prodex makes no claims that these construction systems are universally accurate. They are not intended to illustrate proper construction methods (which is ultimately the responsibility of the builder or contractor).