Within the attic insulation is a must.
Hot attic insulation.
A good way to gage if more insulation is necessary is to look in your attic for ceiling rafters.
Whether using loose fill or batts put the vapor barrier closest to the warm side of your installation where hot moist air would get in facing the house s interior in cold climates beneath floor insulation and the attic s interior in hot climates on top of floor insulation.
The most important factor to consider in a warmer climate is the addition of a radiant barrier to whichever type of insulation you select.
A thick insulation between 14 to 18 inches will help reduce heat from entering your home.
If you can see the ceiling rafters you need more insulation.
With insulation more is usually better.
You can use products like radiant barrier on the underside of the roof spray foam or even good old fashioned batts of rock wool denim or fiberglass.
Focus a lot of energy pun intended on the underside of the roof to keep the heat out of the attic and not just the floor of the attic.
The two basic types of attic insulation are rolled insulation and blown in attic insulation.
Some regions don t require a vapor barrier.
And yet for example our fresno calif franchise abc cooling routinely insulates attics from r 50 to r 60 in home retrofits.
Building codes vary among the thousands of jurisdictions but a typical requirement in hot climates is r 38.