Radiant Barrier -Reduce the heat or coolness of your attic by as much as 50% 

Sacramento Brower Mechanical Energy Upgrade California
"HeatBloc-Ultra radiant attic barrier coating is a water-based, low-emissivity (low-e) product which reflects up to 75% of radiant energy. Designed to be sprayed on the underside of the roof deck, ridge and gable ends, it is breathable and will not increase attic moisture.
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