Foil Board Insulation R Value

Each sheet is created with different r value ratings.

Foil board insulation r value.

Added r value is what the foilboard insulation panel combined with the adjacent still reflective airspaces adds to a particular system. They re much lighter and easier to work with than plywood sheets. At foilboard we create high quality foil insulation with various foilboard r value ratings. The r value is in essence the measurement of an insulation sheet s ability to resist heat flow.

Smaller sizes are also available. This material offers the highest r values about r 6 to 6 5. R value chart for enerfoil tm rigid foam faced insulation. 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 reflective surface of foil insulation takes heat and reflects it back out denying its entry into your premises. What is the r value or r rating of radiant barrier foil insulation. Note from this chart that the ideal r value differs for each part of your home. 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.

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. Thickness inches r value in i p imperial rsi r value in metric 0 5. This testing to designate an r value only applies to conductive heat flow not radiant heat flow.

An r value is a measure of an insulation product s resistance to thermal heat transfer. R value is a term to describe how quickly heat will pass through or be absorbed by a product. Products with foil facing help the panels resist moisture vapor. 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.

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. 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. The r value rating is essentially a gauge on how effective the insulation is at preventing heat conduction. Conditioned per atsm c1289 test method astm c5181 2.