Insulating Layers on Mass and Other Walls

The data in Table IV.14 of Joint Appendix IV from the PDF "Masonry Properties" may be used to modify the U-factors and C-factors from Table IV.12, Table IV.13, and Table IV.14 of Joint Appendix IV from the PDF "Masonry Properties" when an additional layer is added to the inside or outside of the mass wall. For exterior insulation finish systems (EIFS) or other insulation only systems, values should be selected from row 26 of Table IV.14. In these cases, the R-Value of the layer is equal to the R-Value of the insulation. The other choices from this table represent systems typically placed on the inside of mass walls. The following equations calculate the total U-factor or C-factor, where U_Mass and C_Mass are selected from Table IV.12, Table IV.13, or Table IV.14 of Joint Appendix IV from the PDF "Masonry Properties" and R_Outside and R_Inside are selected from Table IV.14 of Joint Appendix IV from the PDF "Masonry Properties". R_Outside is selected from row 26
while R_Inside is selected from rows 1 through 25.

Equation IV-4

 

 

 

Equation IV-5

 

 

The values from Table IV.14 may be used to modify the U-factors of other construction assemblies as well, when non-homogeneous layers are added (see Equation IV-1).

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