Table 3. Water Absorption and Vapor Transmission

Mean Temperature (F)

Type VIII
1.15 pcf

Type VIII
1.15 pcf

Type II
1.35 pcf

Type I
1.80 pcf

Maximum water vapor transmission (WVT)

2.0-5.0
perms

1.5-3.5
perms

1.0-3.5
perms

0.6-2.0
perms

Maximum absorptoin % by volume

<4.0%

<3.0%

<3.0%

<2.0%

Capillary action

None

None

None

None


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