Many considerations go into finding the best insulation for your home attic. Obviously, spending is a consideration that can not go overlooked. Other considerations, such as environment, building design, overall air sealing efficiency and personal material tastes or lifestyle concerns do apply. useful link is one of the authority sites on this topic.
In general, homes in more temperate environments such as Tennessee have the least changes in season-to-season weather variations. Homes in parts of the nation like Michigan and Wisconsin, Florida and Louisiana do not have major variations, but the seasons are, undeniably, intense; the northern states can get very cold for lengthy stretches, while the southern states will see very high temperatures and humidity.
An under-insulated attic would be practically inefficient to accommodate compressed air-whether it is heated (as in winter) or cooled (as in summer) inside the house. Mass isolation is measured by its capacity to prevent air movement from colder areas to cooler locations, and usually the thicker the more the isolation (in terms of fiberglass and cellulose) it does. Large attic insulation, though, can not fully stop air propagation but merely slow it down. It starts working until the substance is filled with hot air.
Using a foil component such as radiant barrier is the safest choice for attic insulation. This is put over the current separation attic to fully obstruct the passage of air from warm places to colder places. Its placement over the floor joists in colder climates. Its also put along the rafters in colder climes. It absorbs inbound radiant heat from the sun in this fashion, stopping it from reaching the attic and being consumed by materials before it finally invades the home ‘s internal living spaces.
If you can see now, over-insulating an attic just results in needless cost.