TegraSeal Products, LLC
9231 Penn Ave S, Suite 2A
Bloomington, MN 55431
Tel: 952-888-1816
Fax: 952-888-1786
Toll Free: 888-815-1816

How does your technology compares to the needle punched GCL’s and what are your points of difference/competitive advantages?

TegraTite has bentonite laminated to HDPE (20-mil virgin-resin) and weighs approximately 1 lb per sf. TegraTite Plus has an additional polypropylene fabric to cover the bentonite layer. As discussed above, we upgraded TegraTite in multiple areas.

TripleSeal is our premier product and nobody has a membrane like it. TripleSeal has bentonite laminated to both sides of the HDPE with the polypropylene fabric. Thus, TripleSeal will form a waterproof seal on both sides of the HDPE membrane-- for the most difficult applications such as blindside lagging with shotcret, elevator pits, underslab, split slab applications. For example, in a green roof application, the TripleSeal is the only product available that will form a waterproof seal to both the roof deck and insulation, thus preventing water migration between these layers. When cold water migrates below the insulation, it cools the roof deck basically negating the value of the insulation and reducing the energy efficiency of the building. One effect cold water has on the roof deck is the possibility for water condensation on the inside of the building. This same principle is true for a below-grade vertical wall. Thus, TripleSeal can increase the energy efficiency of a green roof and prevent the possibility of water condensation inside the structure and the subsequent growth of mold and mildew. TripleSeal, with double the self-sealing/re-sealing bentonite protection, is unique among the bentonite waterproofing membranes.

There are also differences between the GCLs (such as Cetco's Voltex) and our TegraTite membrane. The needle-punched GCL use a woven membrane on one side and a non-woven geotextile on the other. The different ASTM testing requirements make a direct comparison between the two membranes more difficult. But these differences provide at least two competitive advantages for TegraTite.
  1. With Voltex, the activated bentonite must squeeze out between the woven geotextile to contact the concrete and provide the waterproof seal. With TegraTite, the bentonite is in intimate contact with the concrete, preventing water migration behind the membrane and forming a better seal, especially along the seams. Unlike Voltex, the seams on TegraTite don't need additional bentonite mastic to close the seam (which must be specially treated for Voltex). Thus, TegraTite will save time and money during installation. We do recommend simply taping the joints when not using drainage board to prevent exposure during backfilling.
  2. Another important difference is that it doesn't have the HDPE membrane. The bentonite alone has water vapor permeability of approximately 1 x 10-9 cm/s, while the bentonite/HDPE combo has water vapor transmission rate of approximately 1 x 10-13 cm/s, or 1000x less. And generally, the soil is considered to have a relative humidity of 100%. Water vapor can be as significant portion of the water/moisture/humidity that enters the building. Thus, TegraTite (and TripleSeal) also function as a water vapor barrier. We recommend that the architectural specification be written with a water vapor permeability of less than 5 x 10-12 cm/s, or 0.03 perms.
  3. Now, just to provide full disclosure, Cetco does make waterproofing with a thin HDPE membrane to provide a water vapor barrier (Voltex DS, Coreflex, UltraSeal, Swelltite). But the prices of these products are higher than the standard Voltex, where our TegraTite Plus will be very price competitive.
  4. The TripleSeal (1.5 lbs per sf) has the most bentonite per sf and it forms a seal in both directions. TegraTite (1.0 lb per sf) had approximately the same amount of bentonite as the Volex (1.1 lb per sf), which is less than the TripleSeal. These levels of bentonite, with caveats like brackish water or geotextile membranes, are sufficient to form a waterproof seal.
  5. Here are some advantages of bentonite waterproofing and of TegraSeal in particular.
    •  The LOWEST permeability- for bentonite waterproofing, 1000x lower than GCLs
    • Excellent hydrostatic resistance- stronger than 150 ft of water pressure
    • Re-sealing and self-sealing characteristics- bentonite swells to fill 3/8” cracks, membrane seams, or damage during construction. Also prevents water migration behind the membrane.
    • Intimate contact with the concrete- The bentonite in TegraTite is installed directly to the concrete. The intimate contact with the substrate forms a better waterproofing seal.
    • Long lasting- bentonite is 90 million years old, virgin-resin HDPE is rated by the EPA for greater than 100 years.
    • Chemical Resistant- 20-mil virgin-resin HDPE is very resistant to acids and hydrocarbons.
    • Easy to install- TegraTite and TripleSeal rolls are 3.5 ft wide and 75 lbs for a light-weight easy-to-carry roll. Important when crossing rough construction sites.