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+1 855-733-7442
SIGA
1229 N. North Branch St.
Suite 310 Chicago, IL 60642
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SIGA North America Corporate Office
2355 Highway 36 West, Suite 400
Roseville, MN 55113
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SIGA Canada Billing Office
Unit 5 – 85 Glacier Street
Coquitlam, BC V3K 5Z1
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SIGA. Your answer for creating an air and weather tight building envelope.

Popular products

Wigluv®

Single-sided, diffusible and rainproof high-performance adhesive tape for permanent windtight bonding of component layers outdoors.

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Majvest® 500 SA

A self-adhering, vapor permeable membrane with the reverse face efficiently coated by a pressure-sensitive glue for direct bonding to substrates.

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Majvest® 200

Diffusion-open, wind and rainproof facade membrane for permanent protection of the exterior wall.

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Find your SIGA rep

Find SIGA Rep

Construction professionals can buy SIGA products directly from the manufacturer. Contact your local SIGA rep to buy products, receive job site training, and answer any questions you have about building air and weathertight.

Find my SIGA rep

As seen on

The Ultimate Guide to Window Flashing (eBook)

Reduce the risk of building failure

Make sure water can't travel into your wall assembly by expertly flashing your window.

Download now

Upcoming events:

Wed, Apr 22, 2026
8:00 AM – 12:00 PM PST

The airtightness workshop is a fresh look at the features of resilient and efficient envelope design that examines the key layers that comprise the fabric of the building, and how a well-planned weather, air, and vapor sealing strategy avoids risk and saves money.

Sign up for the workshop

Thu, May 21, 2026
8:00 AM – 12:00 PM PST

The airtightness workshop is a fresh look at the features of resilient and efficient envelope design that examines the key layers that comprise the fabric of the building, and how a well-planned weather, air, and vapor sealing strategy avoids risk and saves money.

Sign up for the workshop

Wed, Jun 24, 2026
8:00 AM – 12:00 PM PDT

The airtightness workshop is a fresh look at the features of resilient and efficient envelope design that examines the key layers that comprise the fabric of the building, and how a well-planned weather, air, and vapor sealing strategy avoids risk and saves money.

Sign up for the workshop

“The durability of SIGA's peel-and-stick WRB [Majvest 500 SA] was a game-changer for us, especially since we faced a long turnaround time for our window package, which was coming from overseas. The WRB held up exceptionally well despite the delay, proving its reliability.”
Steven Thacker, Director of Kaven Developments
"We're switching to SIGA and I'm so excited!"
Michelle Apigian, AIA,LEED AP, AICP, CPHC Associate Principal, Practice + Sustainability Leader at Icon Architecture
“For us, Rissan is kind of a game changer. You’re getting a high-quality product with a thick skin that’s still workable, it performs in the cold, and it’s durable enough that you trust it when installing windows. We came from using a lot of other materials, and after switching to SIGA, we won’t go back.”
Christopher Neill, Field Project Manager, Northeast Trade Services

Attend a SIGA educational workshop

High performance building workshops

Get your learn on. SIGA offers AIA-accredited lunch and learns and Passive House building envelope hands on training.

Attend a workshop

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