Heat Gain In The House With Radiant Barrier

Ask The Expert – Q & ACategory: Radiant BarrierHeat Gain In The House With Radiant Barrier
RIMA Expert Staff asked 11 months ago

Is there a difference in heat gain in the house if you place the radiant barrier on the attic floor or roof section? On top of the studs, with a vapor space.

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Best Answer
RIMA Expert Staff answered 11 months ago

Some studies show that the typical reduction of the heat flux in the ceiling of the house with the radiant barrier installed on the roof rafters is around 25%. When placed on top of the mass in the floor, the reduction is as much as 40%. I believe the testing was done with an R-19 mass in the floor. Of course, over time, if dust collects on top of the radiant barrier on the floor, the thermal performance will be reduced, whereas no such reduction would be expected on the roof rafter installation.