This graph shows the temperature at five points in our bedroom, and one point outside the house, over a 24 hour period. The lowest, and most stable temperature, is that of the earth. Our bedroom floor is about 12 inches above an old cement garage floor. The blue line, "earth", is a probe attached directly to this cement floor, which itself sits directly on dirt. There is a small air gap and then one inch of foil-backed polyisocynurate insulation. The purple line, "mid insulation", show the temperature above this 1" layer of insulation. Above this is 4.5" of the same kind of insulation and then pressure-treated floor joists and plywood. The green line, "subfloor", shows the temperature above the 4.5" layer of insulation and just below the plywood. There is 1.5" of Thermacrete directly on top of the subfloor. The "floor" line shows the temperature of this Thermacrete floor. The probe is inside of a thick copper tube, the same kind that carries warm water through the floor to heat the floor. There is one more temperature probe in this room, in the wall. The aqua line shows this temperature. The bedroom is one zone (of the nine in the house) and its temperature is regulated using the wall temperature for the setpoint. The red line shows the outside air temperture, under the eaves.
Back to top-level home-monitor page