Roof Insulation R Value Chart

Polyiso is the industry s premier roofing insulation.

Roof insulation r value chart.

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. Achieving greater r values in attics. R value is a measure of insulation s ability to resist heat traveling through it.

For a very good introductory overview article on r value see r values over at the website of. R3 r18 r21 total roof 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. The table below shows what levels of insulation are cost effective for different climates and.

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. In q4 2013 jm will modify its packaging to reflect lttr values by both test methods. To learn more about r value see roof online s r value page. 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. 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 common denominator among varieties of insulation is the r value.

Insulation level are specified by r value. I calculate insulation resistance to heat loss or r percentage improvement always as relative to the original number. Tapered polyiso minimizes the negative. In comparison an inch of blown fiberglass insulation has an r value of 3 1 3 4 and.

It can be attached using a variety of methods and is compatible with all of carlisle s single ply systems. Here s a handy r value table that covers most types of roof coverings building insulation and a few other materials. As an example a 1 board label will include information from lttr s770 03. Jm s wall sheathing line ap foil and ci max are not governed by lttr test methods and have different r value measurement standards.

Jm sheathing r values will not change. The higher the r value the better the thermal performance of the insulation. 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. Understanding r value thursday december 13 2018 what does r value mean.

Polyiso insulation thickness r value chart. R value of various materials.