This web page calculator provides the overall thermal resistance of a concrete block which contains circular or rectangular air voids. The user can vary the number of rows and columns of voids, and their dimensions. To confirm the input data, the web page will draw a sketch of the voided block, where the direction of heat flow is understood to be from the top to the bottom of the sketch.
This page is password protected please email masonry@mineralproducts.org if you would like access.
Click here to access the R-Value Calculator