Class 1/A Fire Rated ASTM Weight 32lbs/1000sqft 96% Reflective 2013 Energy Tax Credit Installation Guide: On Top of Attic Insulation (Perforated) Overlap 2" to 3" but do not staple joists. Perforated Radiant Barrier MUST be used to avoid trapping moisture in the batt or blown-in insulation. Stapled Under Roof Rafters Staple solid Radiant Barrier from the ridge board down to the eave or horizontally across the rafters, whichever is easier. If ridge venting is used, staple right to the ridge board. If other roof and/or gable venting is used, leave a 2" opening below the ridge board and above the floor joists as shown to prevent trapping heated air. Never block any venting with a Radiant Barrier Over Crawlspaces or Unfinished Basements Staple solid Radiant Barrier along the bottom of the floor joists. Tape all joints with 2" aluminum faced tape for a vapor barrier. In northern climates be aware that the winter temperature in the basement or crawlspace will drop considerably. Over Purlins and Girts Staple or tape to the ridge board of post-frame or steel buildings and pull down to the eave. The extra strength of our Radiant Barrier easily withstands heavy use. Overlap Radiant Barrier 2" and fasten roof and side panels over it. Under Trusses Our Radiant Barrier can span up to eight feet unsupported. Use heavy-duty staples every 8" - 10", or tapping screws every 12" to 16". The superior strength of Radiant Barrier will support 3" to 5" of fiberglass insulation laid on top, if desired. Space fasteners every 6" when supporting added insulation. Over Joists Under Roof Sheathing Lay Radiant Barrier over rafters allowing it to 'drape' several inches. Staple as necessary to hold in place until roof sheathing is fastened down. The air space created by draping will reflect downward heat intrusion, while the bottom side will stop heat transfer with its low emittance surface. The same effect occurs, but in reverse, in the winter months to stop heat loss.
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