Once you understand the purpose of a vapor barrier, understanding where to use one versus using a perforated barrier is easy.
Warm moisture-laden air found inside your home/building structure moves via convection to cooler areas and condenses squeezing out the moisture creating condensation/water droplets. If this condensation comes in contact with fiberglass insulation found in your walls or attic, it will damage the insulation rendering it useless and damage the framing structure.
Therefore, vapor barriers are almost always installed on the warm air side (inside wall) of insulation found in your home to stop the transference of this moiture-laden air to the insulation. In the small region between the southern tip of Texas to the Florida-Georgia border on the Atlantic ocean, vapor barriers are typically installed on the outer side (outside wall) of the insulation.
When installing a radiant barrier over the attic floor, it is a MUST to use a "perforated" radiant barrier to allow any moisture-laden air passing up through the ceiling and any existing insulation to pass through the radiant barrier up and out the attic. If a solid/vapor barrier is used, the moisture-laden air will be stopped, condensate, and then drip onto the ceiling and any existing insulation causing water damage.
98% of our sales of RadiantGUARD™ radiant barrier products are for the perforated version. If you decide you need a solid/vapor barrier, our RadiantGUARD™ Ultra radiant barrier is available in a solid version.
Warm moisture-laden air found inside your home/building structure moves via convection to cooler areas and condenses squeezing out the moisture creating condensation/water droplets. If this condensation comes in contact with fiberglass insulation found in your walls or attic, it will damage the insulation rendering it useless and damage the framing structure.
Therefore, vapor barriers are almost always installed on the warm air side (inside wall) of insulation found in your home to stop the transference of this moiture-laden air to the insulation. In the small region between the southern tip of Texas to the Florida-Georgia border on the Atlantic ocean, vapor barriers are typically installed on the outer side (outside wall) of the insulation.
When installing a radiant barrier over the attic floor, it is a MUST to use a "perforated" radiant barrier to allow any moisture-laden air passing up through the ceiling and any existing insulation to pass through the radiant barrier up and out the attic. If a solid/vapor barrier is used, the moisture-laden air will be stopped, condensate, and then drip onto the ceiling and any existing insulation causing water damage.
98% of our sales of RadiantGUARD™ radiant barrier products are for the perforated version. If you decide you need a solid/vapor barrier, our RadiantGUARD™ Ultra radiant barrier is available in a solid version.
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