Blown-in insulation is much more airtight than standard insulation that comes in the form of rolled batting.
Radiant barriers are utilized to reduce summer heat gain in attics. Attics heat up when the sun’s radiant energy heats the shingles and the heat is transferred to the interior attic space through the roofing materials via conduction.
If you need total protection from direct sunlight, that may be what is keeping you from enjoying your patio to the fullest on a hot summer day
Unless your home was specially constructed for energy efficiency, you can probably reduce your energy bills by adding more insulation. Many older homes have less insulation than homes built today, but even adding insulation to