Johns Manville Introduces Gorilla Wrap, DuraBase

The Engineered Products Group of Denver-based Johns Manville (JM) has unveiled two new building
products: Gorilla Wrap™ house wrap, and DuraBase™ asphalt and nonwoven polyester roofing

The manufacturer and marketer of building and specialty products reports Gorilla Wrap, a
tear-resistant house wrap made of nonperforated, nonwoven polymeric material, increases energy
efficiency and offers maximum moisture control. The product’s tear resistance is 300 percent higher
than the leading house wrap, according to the company.

“Combined with its tear strength and superior ultraviolet inhibitors that allow at least six
months’ exposure time, Gorilla Wrap gives builders greater peace of mind and increased flexibility
with job scheduling,” said Fred Stephan, vice president and general manager, High Performance
Nonwovens, JM Engineered Products Group.

The company’s DuraBase product combines asphalt technology with high-performance nonwoven
polyester reinforcement, resulting in a puncture-resistant underlayment that holds nails better and
has greater tear strength than synthetics or felt, according to the company. The product also
offers waterproofing and ultraviolet resistance, and unrolls flat during installation in warm or
cold weather.

“Since JM is the only manufacturer with the ability to produce this combination of asphalt
and nonwoven polyester, we can offer builders and contractors this innovative product that provides
the performance of synthetics with the benefits and value of felt, while also providing the
industry’s most efficient installation process,” said Zain Mahmood, vice president and general
manager, Construction Material & Systems, JM Engineered Products Group.

January 1, 2006