My attic currently has batt insulation between the joists, and a second layer of batt insulation on top of that. In the summer, the second floor is quite a bit warmer than the first floor. I'm thinking about adding more insulation to the attic, but I'm not sure what the best approach is.
Originally I was considering simply throwing another layer of batt insulation on the floor. Now I'm thinking about insulating the roof instead, by adding batt insulation between the rafters.
Obviously I'd have to extend the baffles, to allow air to flow up to the ridge vent.
Would this approach cause any moisture, or any other unforeseen problems? Is there any benefit to this approach, over simply adding an additional layer of batts to the floor? Should I use faced or unfaced batts?
Best Answer
Remember, heat rises. In the summer the second floor will be hotter than the first for several reasons. I found that after reaching a reasonable amount of insulation in the attic which helps more in the winter season, removing the heat from the attic is the best remedy. I installed a power vent running off a thermostat. You need to make sure you have enough vents around the eve of the house and that they are not blocked for this to work effectively. The cooler outside air will replace the hot attic air and as hot air rises, this happens quickly. It worked for me when I lived in New York, but now that I am in Florida it is even more important to get the heat out of the attic. Most Florida homes have wind turbine vents and several of them to make this effect work. Newer homes here have high ceilings eliminating attics.