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A Common Problem
Over the years we have found that most of the San Antonio area homes we visit have inadequate levels of insulation. For proper protection from the heat, your attic insulation should have a minimum insulation rating of R38. That equates to roughly 10 to 12 inches of fiberglass batting or blown cellulose fiber insulation.
While addressing the level of insulation in your attic, you may also want to consider removing the old insulation. This is especially true if your existing insulation has been damaged by rodents.