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