all of the following are clues that insulation may have been added in a flat roof except\nplugged holes in…

all of the following are clues that insulation may have been added in a flat roof except\nplugged holes in roof coverings or ceilings\nvents added to the roof\na higher - than - expected roof surface temperature in winter\nextra thickness to the roof\na lower ceiling height than expected\nquestion 24\nwhich insulation is controversial with respect to health issues?\npolyurethane\npolyisocyanurate\nurea formaldehyde\nphenolic board\nvermiculite

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