Originally Posted by
hvacvegas
Most of the benefit being?
If you spray the roof sheathing, then you have to heat and cool the space in the attic. Whats worse, having a super-insulated duct system in a well ventilated attic, or having to heat and cool your entire attic?
Seems to me like starting your envelope at the drywall is a good place.
All of the homes we've done with geo-thermal have been high efficiency homes and all have had the closed cell foam insulation installed under the roof. This provides both basic insulation as well as a thermal barrier against the sun load, as well as sealing the attic. Naturally forced, controlled ventilation is a must but forced ventilation that can be controlled is far superior to natural ventilation that runs willy-nilly and decreases as it gets warmer outdoors due to less chimney effect. In winter, those attics get quite warm just from convection air rising from the living space. In summer, with well sealed and insulated ducts, they stay warm but not hot. Thus, the actual load on the 2nd floor zone is decreased as opposed to a 135° attic space.
If YOU want change, YOU have to first change.
If you are waiting for the 'other guy' to change first, just remember, you're the 'other guy's' other guy. To continue to expect real change when you keep acting the same way as always, is folly. Won't happen. Real change will only happen when a majority of the people change the way they vote!