As a polyethylene/asphalt rubberized waterproofing membrane that is self-adhesive, the Bituthene® low temp roll is highly versatile. It can be used for parking decks and elevated plazas as well as tunnels, below-grade basements, and other subterranean applications. In this post, we’ll cover all the key facts you need to know about this waterproofing membrane!
It Can be Cold-Applied
The Bituthene® Low Temp roll is great for waterproofing concrete, wood, and masonry surfaces where surface and ambient temperatures are between 25°F (-4 °C) and 60°F (16 °C). It can be used in both above- and below-grade applications. The Bituthene® 3000 roll is an excellent option for surfaces and ambient temperatures of 40°F (5°C) or above.
It Has High Impact Resistance and Chemical Resistance
Due to the cross-laminated film of the Bituthene® low temp roll, dimensional stability is provided. This also means that it has high tear strength along with puncture and impact resistance.
Additionally, you can rest assured that your building or structure will be well protected from the elements, as this waterproofing roll is also chemically-resistant. It provides superior protection against external contaminants, such as aggressive soils and groundwater.
It Is Flexible
The Bituthene® Low Temp roll is a flexible material, meaning that it can accommodate shrinkage movement and minor settlement.
Its Thickness Is Controlled
As a factory-produced sheet, you can count on the Bituthene® Low Temp roll to deliver a controlled thickness. This ensures constant, non-variable site application.
Surface Preparation Is Key
Surfaces must first be prepared to have good structural integrity and be devoid of gaps, spalled regions, loose aggregate, and protruding sharp edges. Clean exposed surfaces to get rid of pollutants, grease, oil, and wax. Clear the dirt, loose stones, dust, and grime. Then, allow a set amount of time for the concrete to dry (at least fourteen days for lightweight structural concrete and seven days for regular structural concrete).
If time is of the essence, use Bituthene Primer B2 LVC or Bituthene Primer B2 to prime wet surfaces or green concrete for membrane installation.
Application Steps for Horizontal Surfaces
It is recommended that all horizontal surfaces be sloped to drain at least 1/8 in. per foot (11 mm per meter).
To ensure that laps shed water, apply the membrane from the low point to the high point. Overlap each seam by a minimum of 2.5 inches (65 mm). Spread out every end lap. As soon as you can, roll the membrane completely and firmly. Employ a regular garden roller loaded with water that is less than 30 inches (760 mm) broad and weighs at least 75 pounds (34 kilograms) to roll the flooring. To enable the membrane to completely cover the primed substrate, cover the roller’s face with a robust material, such as two wraps of indoor/outdoor carpet or a 1/2 in. (13 mm) thick plastic foam.
By the end of the day, Bituthene® Liquid Membrane should be used to seal all membrane terminations and T-joints.
Application Steps for Vertical Surface
Apply the membrane up to an 8-foot length (2.5 meters). Overlap each seam by a minimum of 2.5 inches (65 mm). Apply membrane to higher walls in two or more sections, with the highest part covering the lowest by at least 2.5 inches (65 mm). Use a hand roller to do so.
Terminate the membrane at the appropriate grade level. Using the butt end of a wooden tool, such as a hammer handle, press the membrane firmly against the wall or fasten it into a groove. Poor seals can result if high pressure isn’t applied at terminations. Lastly, seal top-of-wall terminations with Bituthene® Liquid Membrane or Bituthene® Mastic.
We hope you found this guide useful in learning about the Bituthene® Low Temp Roll and its complementary products. For more information, reach out to the experts at Metro Sealant!