Thermal Insulation Foil Roll R Value

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Thermal insulation foil roll r value.

For example if you have a type of insulation that has an r value of r 5 per inch of thickness you will need a depth of 6 inches of this insulation installed your attic to reach r 30 if you live in zones 2 or 3. If you read the fine print this rating is always achieved as part of an overall assembly which usually includes a lot of dead air spaces. However we see claims of up to r 14 for some bubble products. Typical fibreglass insulation for example requires 270mm of insulation to get to a u value.

In contrast reflectix is always tested as part of an assembly e g. R value up to 15 67 with one layer up to 20 10 with two layers. Foils do not use r values as you state but they do use a k value which can be converted into r value just like kwh can be converted into btus. In addition to the standard fibreglass insulation roll buyers can choose rolls with acoustic dampening properties fire resistance or where space is limited use reflective foil rolls with a great r value that have less depth and are slimmer than standard fibreglass rolls.

From the research i have done a k 19 value equals an r 5 6. U value of foil insulation. Sound barrier excellent sound deadener material. The u value is a simple measure of how easily heat is able to pass through a material.

Standard insulation is tested as a material with an r value per inch of thickness for example r 13 for 3 5 quot. Vapor barrier prevents condensation unaffected by humidity and moisture mold resistant can be used outdoor indoor. Most brands of insulation have a u value displayed on their products as a matter of pride. Note from this chart that the ideal r value differs for each part of your home.

Bubble foil does offer some r value because of the bubbles because remember radiant barrier does not have an r value on its own. 48 in x 10 ft roll industrial strength commercial grade no tear radiant barrier wrap for weatherproofing attics windows garages rv s ducts more. Of owens corning fiberglass and r 5 per inch with foamular foam board. Double bubble reflective foil insulation.

Lower u values mean better thermal performance. It is also a common mistake to only consider a material s r value when choosing insulation. A simulated wall with 2x4 studs dry wall an air space and layer of reflectix. Insulation companies who make metallic bubble wrap or their distributors like to boast about their products attributes and often add the equivalent reflective r values to the conductive values giving an overall equivalent r value.

It s highly possible for a thinner reflective material to provide better thermal performance than a thicker non reflective product even though the thicker product will have a higher r value.