The Polymeric Exterior Products Association (PEPA) is the trade association representing the breadth of polymeric exterior building and home improvement products used on and around homes across North America.

Become a Member

Formerly known as the Vinyl Siding Institute, we’ve long championed the benefits of resilient, beautiful siding. As our category has evolved, we’ve expanded our focus to represent the growing diversity of architectural products that share those same performance and aesthetic features.

A Category United

PEPA represents a broad range of polymeric building materials, bringing together some of the most advanced exterior products on the market.

Explore Polymeric Exteriors

Our Mission

Defending and expanding markets for polymeric products by promoting their benefits to the industry and its consumers

Preparing a larger, more experienced workforce to meet growing demand, through expanded installation training and certification programs

Championing members' interests at every level of government and industry, including proposed changes to ASTM and other code body standards and legislation to protect the right to choose polymeric exteriors

Elevating industry sustainability facts through life cycle inventory and environmental product declarations

Building a thriving community where ideas are shared, partnerships are formed, and collective success is celebrated

Fostering and promoting new innovations that push the boundaries of what's possible in beautiful, high-performance and sustainable exterior design

Focused Industry Wins

We drive positive changes that enhance the entire polymeric products industry, from legislative victories to advances in professional training and standards.

Shape the Future of Exteriors with Us

Let’s unleash new possibilities that drive more value for all.

Become a Member

Gain a wealth of benefits and opportunities for professional growth, networking and advocacy.


Make Your Voice Heard

Engaging public officials helps them make smarter policy decisions affecting polymeric products. Access free PEPA resources that help you advocate effectively in your community.

Get Involved

45 Years of Leadership

PEPA builds on VSI’s more than four-decade legacy of supporting the industry’s growth and innovation.

View our History