![]() My math says sustaining a 50F temperature difference (taking you down to -23F) across a ~12" circumference at R-4 is about 4 watts per linear foot. Apply a 1", R-4 jacket of continuous EPDM pipe insulation. Get a self-regulating heating cable and apply it to your 4" schedule 40 pipe. I will put this out there as an intermediate option: Or you could try a proper EPDM foam pipe insulation sleeve, like one or maybe several layers of this:īut before you resort to any of this, consider this:Īnd consider just burying the pipe and tank deep enough to start with, well below the frost line for your area. XPS would likely work, but is currently a ridiculous choice from a greenhouse gas perspective (until the next administration bans the blowing agent), and slightly more expensive to boot. If you want to pursue this, use a high-density EPS. ![]() Attempting to entrain air long-term in a poorly drained subsoil with waxes or binders is probably a fool's errand. ![]() ![]() Mineral wool saturated with moisture probably doesn't insulate as well as mineral wool with lots of entrained air. Mineral wool wicks moisture well enough to be used as a hydroponics grow medium (see the Grodan and Cultilene blocks). I have doubts that fibrous insulation is *worthwhile* below grade, unless very well-drained.
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