Roof Insulation R Value Chart

Insulation level are specified by r value.

Roof insulation r value chart.

The common denominator among varieties of insulation is the r value. As an example a 1 board label will include information from lttr s770 03. I calculate insulation resistance to heat loss or r percentage improvement always as relative to the original number. R value is a measure of insulation s ability to resist heat traveling through it.

Jm sheathing r values will not change. 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. Polyiso is the industry s premier roofing insulation. R value is a measurement of thermal resistance and measures the ability of heat to transfer from one side of an object to another.

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. R value of various materials. Jm s wall sheathing line ap foil and ci max are not governed by lttr test methods and have different r value measurement standards.

The table below shows what levels of insulation are cost effective for different climates and. R3 r18 r21 total roof r value. Recommended home insulation r values. Calculate percent improvement in r value.

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. The increase r21 r3 exactly 18 the value by which you are increasing the r value. In q4 2013 jm will modify its packaging to reflect lttr values by both test methods. In comparison an inch of blown fiberglass insulation has an r value of 3 1 3 4 and.

Achieving greater r values in attics. The higher the r value the better the thermal performance of the insulation. Here s a handy r value table that covers most types of roof coverings building insulation and a few other materials. For a very good introductory overview article on r value see r values over at the website of.

It can be attached using a variety of methods and is compatible with all of carlisle s single ply systems. You should of course see the manufacturer provided technical data sheet for the r value of specific products. As a benchmark one inch of solid wood has an r value of 1. Tapered polyiso minimizes the negative.

Polyiso insulation thickness 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.