The sun heats up the roof and then the heat is transferred by radiant heat across the attic space until it hits the attic insulation.
Fiberglass attic insulation vs reflective.
Radiant barriers reflect radiant heat.
Radiant barriers and reflective systems.
Reflective insulation is significantly thinner than fiberglass insulation.
Air migrates from warmer spaces toward colder spaces and insulation is designed to help prevent or at least slow that migration.
The key to using reflectix properly is that you should take a little time to understand how reflective insulation works in the first place.
Remember traditional attic insulation has r value that works to slow conductive heat.
The radiant barrier resulted in roughly 4 times more savings than the added insulation.
Which is better will depend on the topography of the specific roof you re insulating.
Both types of heat are trying to enter your home on a hot summer day.
What is the right insulation for an attic.