- Double-sided foil insulations: REFLECTION and EMISSION functioning in all positions.
- Single-sided (anti-glare) roll foil: REFLECTION or EMISSION is functioning, but not both.Walls: in summer, only low emission occurring, but will cease if R1.5-2.5 batts press against foil.
- Sloping ceilings: in hot climates, two foil radiant barriers needed for dual hot/cold climates, use a combination of bulk and foil, with 50-100mm airgap between foil and batts.
Radiant Barrier versus Fiberglass Insulation Hot Box Test
Interested in seeing the effectiveness of radiant barriers? Watch this short video from http://www.insulationstop.com, the leader in reflective foil insulation. This hour long hot box test is condensed down to a few minutes but clearly shows how a radiant barrier can control the amount of heat gain in an area. Watch the thermometers as the temperature in the side with just fiberglass insulation goes through the roof, literally!