11.   Would rigid insulation be OK to insert?

a. + insulation >>共 163
thermal 4.69%
extra 3.52%
new 3.52%
rigid 3.23%
asbestos 2.93%
blown-in 2.64%
home 2.35%
sound 2.35%
better 2.05%
old 2.05%
rigid + n. >>共 399
rule 4.99%
system 2.69%
structure 2.69%
body 2.30%
control 2.10%
form 2.10%
labor 1.90%
standard 1.50%
schedule 1.50%
discipline 1.40%
insulation 1.10%
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