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The main advantage of high r cw plus insulation over other xps boards is its higher r value per inch.
Highest r value insulation per inch. R value is the measurement of an insulation material s thermal resistance. Here are the installation methods from lowest to highest average r value per inch. Open cell spray foam is rated at about r 3 5 per inch while closed cell spray foam is much more efficient at r 6 0 to r 6 5 per inch. Insulation systems catalog for commercial buildings brochure pdf 5 01 mb.
It provides r values that range from 3 6 to 4 2 per inch. Closed cell spray foam insulation. Asbestos cement board r value. Closed cell spray foam has a far better r value per inch than other less effective insulations like cellulose fiberglass or even open cell foam.
The r value is r 3 5 to r 3 6 per inch so filling a 2 4 cavity yields about an r 13. Along with knowing the r value of a particular insulation it is also important to calculate the r value of a total system. Consider spray foam anywhere you need an air barrier as well as insulation. Estimated r value of asbestos insulation per inch for pipe insulation corrugated paper.
For example a wall with 3 fiberglass batting r value of 10 8. For every type and material of insulation check the r value per inch of thickness that the manufacturer has listed. Asbestos corrugated paper pipe insulation. In layman s terms it measures an insulation s ability to resist heat transfer through contact or conduction.
Asbestos cement shingle siding. It has a lower r value per inch than closed cell foam and is vapor permeable. It provides about r 5 per inch. Aerogel has the next highest r value about r 10 to r 30 per inch followed by polyurethane pur and phenolic foam insulations with r 7 per inch.
Opt for the closed cell variety if you need an air barrier vapor barrier and efficient insulation in the least amount of space possible. Asbestos lagging and paste will have a lower value. Some products have reinforced facing to make them sturdier. Now at a glance the insulation ratings above could be a little confusing so keep in mind those are the per inch r values.
Vacuum insulated panels have the highest r value approximately r 45 in u s. Thermal conductivity k 0 15. This material offers the highest r values about r 6 to 6 5. In comparison an inch of blown fiberglass insulation has an r value of 3 1 3 4 and an inch of blown cellulose in an attic has an r value of 3 2 3 7.
Asbestos loose packed fibers powder.
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