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