Roof Insulation R Value Chart

Carlisle s tapered insulation helps promote rooftop drainage while providing excellent insulating value.

Roof insulation r value chart.

R value of various materials. You should of course see the manufacturer provided technical data sheet for the r value of specific products. R3 r18 r21 total roof r value. R value insulation chart find your zone on the map and then use the chart to determine the level of insulation you need to properly insulate your attic walls floors and crawlspaces.

The common denominator among varieties of insulation is the r value. Tapered polyiso minimizes the negative. As an example a 1 board label will include information from lttr s770 03. In comparison an inch of blown fiberglass insulation has an r value of 3 1 3 4 and.

R value is a measurement of thermal resistance and measures the ability of heat to transfer from one side of an object to another. In q4 2013 jm will modify its packaging to reflect lttr values by both test methods. Insulation level are specified by r value. As a benchmark one inch of solid wood has an r value of 1.

Depending on where you live and the part of your home you re insulating walls crawlspace attic etc you ll need a different r value. A higher r value means that the insulation will do a better job of holding in conditioned air whether that s heat in the winter or cool air in the summer. Typical recommendations for exterior walls are r 13 to r 23 while r 30 r 38 and r 49 are common for ceilings and attic spaces. The table below shows what levels of insulation are cost effective for different climates and.

The following table provides typical r values and rsi for various materials these r values were taken from manufacturer technical data sheets and are the reported r values per inch of actual products. Recommended home insulation r values. Understanding r value thursday december 13 2018 what does r value mean. R value is a measure of insulation s ability to resist heat traveling through it.

Jm sheathing r values will not change. Polyiso is the industry s premier roofing insulation. For a very good introductory overview article on r value see r values over at the website of. Calculate percent improvement in r value.

To learn more about r value see roof online s r value page. The increase r21 r3 exactly 18 the value by which you are increasing the r value. Polyiso insulation thickness r value chart. It can be attached using a variety of methods and is compatible with all of carlisle s single ply systems.

The higher the r value the better the thermal performance of the insulation. I calculate insulation resistance to heat loss or r percentage improvement always as relative to the original number.