I have been working in my attic trying to lower my energy bill. This is a house I bought so I'm doing this after the fact. I started by air sealing as much possible, installing airtight recessed cans, Great Stuff foaming the HVL's and properly venting them in the process. I installed a powered gable fan and installed double foil insulation on the roof rafters for ventilation I then started adding a layer of R30 on top of the existing insulation. I just happened to pass by a job site trash pile and picked up some 2x4 sized batts and was wondering if it would be a good idea to insulate the Gables. I live in South Louisiana where the Humidity is always high and the temps during the summer can reach 100 degrees.