Bijan Mansouri

Bijan Mansouri is the Technical Manager at Magnera, working specifically on the TYPAR brand of weather protection products. He has spent over 25 years developing solutions to meet emerging building code standards. Holding bachelor and masters degrees in Mechanical/Aerospace Engineering, Bijan is a recognized expert in building envelope systems and a member of the Air Barrier Association and ASTM International. He can be reached at BijanMansouri@magnera.com.

Liquid flashings offer a seamless, fully adhered seal around window openings—eliminating concerns about tape adhesion loss due to thermal cycling or installation variability.

What Building Science Professionals Need to Know About Solving Challenges in Building Envelope Transitions

Sealing the Gaps

Bijan Mansouri

September 19, 2025

While Weather-Resistive Barriers (WRBs), flashings, and sealants perform reliably in controlled conditions, the true challenge arises at joints, corners, and penetrations—where distinct components and trades meet.

Understanding How Fiber Cement and Other Cladding Materials Can Influence Building Wrap Performance

Bijan Mansouri

November 5, 2021

The type of cladding material chosen for a project not only affects the building’s overall aesthetic, it also plays a central role in how the rest of wall system should be designed to best protect the structure from the elements.

New Generation of Building Wraps

Innovative Products Take on Bulk Water Drainage

Bijan Mansouri

June 11, 2018

Among the many performance characteristics we expect of today’s building wraps, draining bulk water is increasingly gaining importance

Finding Harmony Between Waterproofing and Breathability

Bijan Mansouri

December 11, 2017

No matter how tightly we construct our buildings, water is inevitably going to find its way in

Credits: 1 AIA LU/HSW; 0.1 ICC CEU; 1 IIBEC CEH; 0.1 IACET CEU

On Demand In modern roofing systems, vapor retarders and air barriers do more than just minimize air leakage—they’re essential to maximizing performance and longevity. This engaging course dives into the next generation of moisture control: permeable vapor retarders and air barriers. Discover how these cutting-edge technologies are transforming low-slope roofing assemblies by improving energy efficiency, managing moisture, and boosting wind uplift resistance.

Credits: 1 AIA LU/HSW ; 1 IIBEC CEH; 0.1 IACET CEU

On-Demand Designing a high-performance building enclosure requires more than just surface-level protection; it demands a rigorous, performance-based mastery of below-grade water and gas mitigation. This discussion will provide an expert-level analysis of below-grade waterproofing within the comprehensive framework of the high-performance building enclosure.

Bijan Mansouri

ARTICLES

What Building Science Professionals Need to Know About Solving Challenges in Building Envelope Transitions

Understanding How Fiber Cement and Other Cladding Materials Can Influence Building Wrap Performance

New Generation of Building Wraps

Finding Harmony Between Waterproofing and Breathability

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