Installing Radiant Barrier in the Attic
Stapled to roof chords: 
This method requires the most work and time to install. It is generally considered the best method in cooling dominated areas as it keeps the entire attic space cooler, and blocks radiant heat from hitting ductwork and air handlers located in the attic. In addition, attic air leaked into the return side of the ductwork is at a lower temperature, creating less stress on the cooling equipment and increasing its efficiency. In this location, the foil is generally not affected by dust.
- Perforated material should be used for this job
- Unroll the Radiant Barrier, hold in place and staple to bottom of roof joists
- Cut around vertical bracing
- If possible, it is generally easiest to apply the strips perpendicular to the direction of the roof joists
- Overlap each run by about 2 inches
- There is no need to tape the seams in this installation
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Under the roof decking:
This method is used primarily in new construction or when replacing roof decking. It works similarly to "Stapling to roof cords", however, is easier to install.
- Perforated material is preferable for this job
- Unroll the Radiant Barrier over the top of the roof trusses or joists
- Allow the material to sag down about 2 inches between each joist
- Periodically staple to hold it in place
- Overlap each run by about 2 inches
- There is no need to tape the seams in this installation
- Nail roof decking on top as usual
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On top of Insulation: , 
This is perhaps the easiest and probably the most common way in which RB is installed in the attic. It works to help reduce direct radiant heat gain through the ceilding in the summer. In addition it helps to retain heat in the winter.
- You must use perforated material for this job
- Unroll the Radiant Barrier over the existing attic insulation
- Cut around vertical bracing
- Periodically staple to the ceiling joists to hold it in place
- Overlap each strip by about 3-4 inches
- There is no need to tape the seams in this installation
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Reflective Sheathing:
Several companies offer sheathing products with aluminum foil laminated to it. You can make your own reflective sheathing for a fraction of the cost. Just staple our 48" wide foil products to regular OSB or Plywood steathing.
- Use industrial grade perforated material for this job
- Unroll the 48" wide Radiant Barrier over the sheathing and staple or glue it in place.
- Cut the foil off at the end of the sheathing.
- You have just made reflective sheathing or roof decking at a savings of about 35 cents per sq ft.
- When you install it on your roof, face the aluminum side down toward the attic space.
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