TERM Underslab Water|Termite Barrier excludes both water, Formosan termites, and all other pests. Here is a quote from ASTM E 1643 committee members:
X2.3.2.4 Protection Theory- “Polyethylene films and reinforced polyethylene films are seldom capable of surviving normal jobsite traffic and abuse….
X.2.3.3.1…….Even with a cushion of sand or granular fill, these products can still be easily damaged.
Slab construction is the most destructive construction process. Strong and abuse resistant underslab barriers and needed. Class A vapor barriers of 15 mil thickness only require 2000 grams (4.41 lbs) of puncture resistance. TERM Underslab Water|Termite Barrier is designed with over 100,000 grams (224 lbs.) pounds of puncture resistance. Moreover the 69 mil thickness of TERM Sealant Barrier in the middle of TERM's 95 mil thickness is designed to self-seal small punctures. Termites , with a width of 0.02", can work their way through extremely tiny punctures.
On top of all this abuse resistance, TERM Underslab Water|Termite Barrier waterproofs and excludes Formosan termites and all other pests, barriers are needed.