determining {TAIL ~ the thermal resistance} of the insulation from the known cavity depth and {HEAD ~ insulation density} 
determining { TAIL ~ the thermal resistance } of the insulation from the known cavity depth and { HEAD ~ insulation density }
OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD