Heat loss factor for stone exterior walls......Cosmo

Cosmo_3

How do you guys figure r-factor for stone walls? I have learned to use 1/2 R-value per inch thickness. This homeowner plans to trowel-plaster the interior of the stone wall for an interior finish. After much friendly advice to try to separate the interior wall from the stone, they will not budge!!!

Let's see what we come up with....



Cosmo Valavanis
Dependable PHC Inc

Jerry Boulanger_2

According to ASHRAE

Fundamentals 2001, page 25.15, the R value per inch of thickness for basalt is about 0.6, and for shale, granite, limestone, dolomite and marble all pretty much the same at about .033. A 10" thick granite wall would have an R value of 0.33 - very low!

Cosmo_3

Thanks!!

I have to order materials from ASHRAE, then I wouldn't have to keep asking here....of course it is so much fun!! Wow, it's late for me.... how bout' you?

Thanks again Jerry!


Cosmo Valavanis
Dependable PHC Inc