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A.The terms are
probably based loosely on the HPVA specifications
for water resistance. The HPVA (Hardwood Plywood
Veneer Association) set up the designations Type I,
Type II, and Type III to denote degrees of water
resistance. The Type I designation undergoes the
most strenuous testing and can be considered to
mean "waterproof." Type II testing is less
strenuous and can be considered to mean "water
resistant." Type III would not be considered water
It is important to note that such testing is
intended for plywood only and doesn’t
really have a lot of meaning outside of plywood
gluing. The ASTM has set up similar specifications
for determining water resistance. Joints that pass
their "wet use" specification are considered to be
waterproof. Other industries such as the door
industry use other specifications in determining
Caulks Adhesives and Sealants
Codes and Standards
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