Foil Board Insulation R Value

Smaller sizes are also available.

Foil board insulation r value.

The r value is in essence the measurement of an insulation sheet s ability to resist heat flow. Thickness inches r value in i p imperial rsi r value in metric 0 5. Note from this chart that the ideal r value differs for each part of your home. The r value rating is essentially a gauge on how effective the insulation is at preventing heat conduction.

Added r value is what the foilboard insulation panel combined with the adjacent still reflective airspaces adds to a particular system. The reflective surface of foil insulation takes heat and reflects it back out denying its entry into your premises. Products with foil facing help the panels resist moisture vapor. Most people are familiar with the term r value when discussing insulation properties.

The reflective foil facing makes it an excellent insulation board when radiant heat is involved. Each sheet is created with different r value ratings. R value is a term to describe how quickly heat will pass through or be absorbed by a product. Working with home insulation boards insulation panels typically come in 4x8 foot sheets.

Conditioned per atsm c1289 test method astm c5181 2. What is the r value or r rating of radiant barrier foil insulation. This testing to designate an r value only applies to conductive heat flow not radiant heat flow. Basically r values range from 1 5 to 7 and the higher the number is the more effective the insulation sheet is at increasing thermal efficiency and thereby insulating your home.

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. Polyiso is typically used with a foil facing and it has an r value of 7 0 to 8 0 per inch of thickness. The foil facing also makes it very easy to seal with good quality foil faced tapes. Johns manville ap foil faced polyiso foam sheathing boards are available in r values up to r 28 and offer a reflective foil facer on one side and a non reflective facer on the other.

R value chart for enerfoil tm rigid foam faced insulation. The actual amount of airspace adjacent to the material will have a profound impact on the r value the larger the space the higher the r value. It s a measure of how long it takes a heat absorbing product to absorb 100 of its potential and begin to transfer that heat out the other side of the product. They re much lighter and easier to work with than plywood sheets.