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