A secondary method of installation instead of installing under the attic rafters is to lay the foil insulation over the attic floor.
Reflective foil in attic.
Note that reflective foil will conduct electricity so workers and homeowners must avoid making contact with bare electrical wiring.
If installed on top of attic floor insulation the foil will be susceptible to dust accumulation and may trap moisture in fiber insulation so it is strongly recommended that you not apply radiant barriers directly on top of the attic floor insulation.
Yes but a foil product will work much better than a radiant barrier paint ceramic paint additive or micro spheres.
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This foil is normally installed across the insulation that covers.
Also sheets of foil are more practical and economical that shredded pieces of aluminum radiant barrier chips and more effective because they allow for full coverage and easy access to your attic if needed.