Actual meaning of R-19 insulation

[coldkeeper1]

I just read in some specs a requirement in regards to the application of some blown-in insulation they call R-19. Is "R-19" just the tradename, or is it the actual R value of this insulation once it´s applied?

 

[IRstuff]

R-19 is a pretty common value for home insulation in the 70's:

http://www.srpnet.com/energy/ask/insulation.aspx

TTFN

FAQ731-376

 

[imok2]

The effectiveness of insulation is measured by its "R-Value". The higher a material's R-Value, the better it resists the flow of heat, and therefore, the better it insulates the building. For example, R-19 insulation retains heat better than R-11 insulation. You may be able to estimate the R-Value based on the thickness of the insulation. The most common materials sold for wall and ceiling insulation provide air-based insulation. That is, the materials trap air in tiny pockets, and the air provides the insulation. Each inch of thickness of your average air-based insulating material provides an R-Value of about 3. Therefore, a 3.5-inch thick batt of (average air-based) insulation provides an R-Value of about 11. A 6-inch thick batt of insulation provides an R-Value of about 19.

 

[IRstuff]

see:

http://en.wikipedia.org/wiki/R-value_(insulation)#List_of_examples

for a list of typical R-values for insulation

TTFN

FAQ731-376

 

[ChrisConley]

From your description 'R-19' would be the trade name, because the actual R value is dependent on the thickness of the wall cavity that the insulation is being blown into.