jklingel
Well-known member
Does anyone have good info, or a link, for a below-grade design temp or degree-days? Our above-grade design temp is -51 and our degree days are 14,400 or so, but I can not find anything firm on what numbers to use for below-grade. I'd be curious to know what anyone else knows about how the two are related in cold areas, like Mich/Wisc/Ak, etc. Thanks. j