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‘Blind Side’ Waterproofing Bonds Tighter

Thursday, March 28, 2013

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Preprufe, the longtime backbone of Grace Construction Products'  pre-applied waterproofing line, has a new family member that boasts easier application and a stronger adhesive.

Preprufe Plus is "the next generation" of Preprufe for pre-applied or blind-side waterproofing applications, according to Grace, a global provider of water and moisture protection.

Preprufe Technology

In pre-applied waterproofing, the membrane is installed before construction of the below-grade area of a building.

Preprufe, in use worldwide for more than 20 years, forms an adhesive bond to the concrete and thus does not rely on the earth outside the building to confine or hold the membrane in place.

Photos: Grace Construction Products

Grace's Preprufe 300R was among the products used to waterproof the foundation of Sonoma State University's Green Music Center. The new Preprufe Plus is designed with a stronger adhesive than other Preprufe products, according to Grace.

Like Preprufe, Grace says, Preprufe Plus is designed to be durable, puncture resistant, chemically resistant, and unaffected by precipitation or moisture during installation. A watertight seal with the concrete prevents lateral water migration, according to Grace.

What's New

The Plus product, however, boasts "stronger and more robust adhesive lap than the standard product to more easily achieve a watertight seam," the manufacturer says. In addition, Plus does not have a release liner, which reduces waste and expedites installation.

"Preprufe Plus is simply rolled or kicked out, which is much faster and easier for the installers than the standard process," which requires installers to lift and unroll the roll, Grace said in a product announcement.


Preprufe Plus can be rolled or kicked out, easing installation, Grace said.  Colored "zip strips" cover a stronger adhesive than that of the standard product.

Preprufe Plus has colored "zip strips" at the top and bottom of the seam area on the roll's edge. The strips cover an aggressive adhesive that, once exposed, allows "a magnetic adhesive-to-adhesive bond" at the seam that is stronger than with the standard product. 

More information:


Tagged categories: Below grade waterproofing; Building envelope; Concrete slab waterproofing; Grace Construction Products; Waterproofing; Waterproofing membranes

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