Roof Insulation R Value Chart

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

Roof insulation r value chart. For a very good introductory overview article on r value see r values over at the website of. The common denominator among varieties of insulation is the r value. Jm s wall sheathing line ap foil and ci max are not governed by lttr test methods and have different r value measurement standards. R value of various materials.

As an example a 1 board label will include information from lttr s770 03. The table below shows what levels of insulation are cost effective for different climates and. I calculate insulation resistance to heat loss or r percentage improvement always as relative to the original number. 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.

Understanding r value thursday december 13 2018 what does r value mean. To learn more about r value see roof online s r value page. Recommended home insulation r values. Jm sheathing r values will not change.

Polyiso is the industry s premier roofing insulation. 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. As a benchmark one inch of solid wood has an r value of 1. 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.

Tapered polyiso minimizes the negative. Achieving greater r values in attics. R value is a measure of insulation s ability to resist heat traveling through it. The higher the r value the better the thermal performance of the insulation.

It can be attached using a variety of methods and is compatible with all of carlisle s single ply systems. The increase r21 r3 exactly 18 the value by which you are increasing the 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. Insulation level are specified by r value.

In q4 2013 jm will modify its packaging to reflect lttr values by both test methods. 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. Here s a handy r value table that covers most types of roof coverings building insulation and a few other materials. In comparison an inch of blown fiberglass insulation has an r value of 3 1 3 4 and.

Calculate percent improvement in r value. R3 r18 r21 total roof r value.