U-value

[airprep]

I am in iraq and i have to initiate load calculations on warehouses and i do not know what to do about these 18 inch thick concrete walls how do i figure out the u-value of this mayerial

[hvacker]

If you have just concrete with no exterior siding I can tell you the # for 12" and 6" and you can probably extrapolate from there.


6"
Depending on the #/cu ft
30# .134
80# .304
140# .671

12"
30# .071
80# .176
140# .478

Have fun!!!

[airprep]

I have got that info in manual N i do keep alot of references here, but we run into alot of irregularities here at camp taji. Like aluminum foam panel warehouses that have 2 inches of foam sandwiched between two panels of aluminum, how would you find the u-value of that to perform proper load calculations, and the numbers in front of the 12",6" brick does that represent a type of brick. It is a bit frustrating, also trying to figure design outdoor temp for iraq there are no set information set for these areas that i knw of. Thanks for the information

[jayhawker]

http://www.builddesk.co.uk/buildeng/calculating_u_values.asp

Maybe this software can help you make the calculations for the U values you need.

[dan sw fl]

I have got that info in manual N i do keep alot of references here, but we run into alot of irregularities here at camp taji.

aluminum foam panel warehouses that have 2 inches of foam sandwiched between two panels of aluminum, how would you find the u-value of that to perform proper load calculations,

One inch of foam might be ~ R-3.
... Sound like R-7 Total might be in the ballpark

... Obtain ASHRAE reference books

Do you have a specific product/material or manufacturer?