HOUSTON – October 7, 2021 – Westlake Innovations, Inc., a subsidiary of Westlake Chemical Corporation (NYSE: WLK), and Nexii Building Solutions Inc. (Nexii) today announced that the companies have formed an alliance to support the construction of buildings with a reduced environmental footprint. Also, Westlake will be the preferred
supplier of certain building materials it makes for Nexii residential construction including siding, stone, roof tiles, trim and molding, pipe and fittings. Nexii is a green construction technology company that designs and manufactures high-performance buildings and building products that are sustainable, cost-efficient and resilient in the face of climate change. Westlake is a global manufacturer and supplier of building products and infrastructure materials that enhance life every day.

The alliance with Nexii supports Westlake’s longstanding commitment to sustainability and stewardship of the environment. In addition to the Nexii alliance, Westlake recently completed its acquisition of Dimex, which manufacturers consumer and building products from post-industrial-recycled polymers; and Boral’s North American building products businesses in roofing; siding, trim and shutters; decorative stone; and
windows.

Headquartered in Vancouver, British Columbia, Nexii has pioneered a proprietary material, Nexiite, that has comparable properties to concrete but contains no Portland cement or lime, reducing carbon emissions. Nexiite is used to create Nexii Panels that are precision manufactured at plants operated by Nexii or Nexii Certified Manufacturers, then are shipped flat-packed to site where they are rapidly assembled. This “whole-building solution” creates disaster-resilient buildings and retrofits with up to [1]75% faster build time1 compared to traditional construction methods and materials. Nexii creates near-zero construction waste onsite and produces buildings that are airtight and energy-efficient, further reducing climate impacts.

About Nexii
Nexii Building Solutions Inc. (Nexii) is a green construction technology company that is
committed to building a vibrant future for people and the planet. Nexii designs and
manufactures high-performance buildings and green building products that are
sustainable, cost-efficient and resilient in the face of climate change. The Nexii System
also significantly reduces construction timelines, enabling the rapid development of
green buildings across North America. Nexii is suited for industrial / commercial /
institutional, mixed-use, multi-family residential and single-family homes, as well as for
the green retrofit market. For more information, visit www.nexii.com, or connect with us
on Instagram (@NexiiBuilds), Twitter (@NexiiBuilds) or on LinkedIn (Nexii Building
Solutions).

About Westlake
Westlake Innovations, Inc. was formed in early 2021 to facilitate the company’s potential
investments in new technologies and pursue innovative digital, mechanical or chemical
applications such as carbon sequestration or recycling. Westlake is a global
manufacturer and supplier of materials and innovative products that enhance life every
day. Headquartered in Houston, we provide the building blocks for vital solutions —
from building products and infrastructure materials, to packaging and healthcare
products, to automotive and consumer goods. For more information, visit the company’s
web site at www.westlake.com.

Footnote: 1 Relative to conventional construction