Roof Insulation R Value Chart

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.

Roof insulation r value chart.

Polyiso is the industry s premier roofing insulation. Recommended home insulation r values. 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. Jm sheathing r values will not change.

Tapered polyiso minimizes the negative. In q4 2013 jm will modify its packaging to reflect lttr values by both test methods. Insulation level are specified by r value. R3 r18 r21 total roof r value.

The common denominator among varieties of insulation is the r value. As a benchmark one inch of solid wood has an r value of 1. Here s a handy r value table that covers most types of roof coverings building insulation and a few other materials. R value is a measurement of thermal resistance and measures the ability of heat to transfer from one side of an object to another.

The table below shows what levels of insulation are cost effective for different climates and. Understanding r value thursday december 13 2018 what does r value mean. As an example a 1 board label will include information from lttr s770 03. 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.

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. 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. I calculate insulation resistance to heat loss or r percentage improvement always as relative to the original number.

To learn more about r value see roof online s r value page. Polyiso insulation thickness r value chart. You should of course see the manufacturer provided technical data sheet for the r value of specific products. Carlisle s tapered insulation helps promote rooftop drainage while providing excellent insulating value.

Calculate percent improvement in r value. The increase r21 r3 exactly 18 the value by which you are increasing 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. For a very good introductory overview article on r value see r values over at the website of.

R value of various materials. R value is a measure of insulation s ability to resist heat traveling through it.