Building Science

Fire resistance

Ensure fire-rating continuity

Maintaining a consistent fire rating throughout a structure is crucial for safety. More than that, building codes around the country require continuity between fire-rated systems. Learn how National Gypsum Company provides fire-rating solutions.


Solutions for creating fire-rated assemblies

The PURPLE Book® is the industry’s leading resource for fire-rated assemblies in commercial construction.

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How to build a shaftwall in commercial construction

Learn the basics of building a shaftwall system from the experts at 1-800-NATIONAL®, including details for corners, duct and elevator door openings.

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Top fire-rated assembly questions and answers

Learn about the testing standard for fire-rated assemblies, modifications permitted to those assemblies and the most common questions about fire-rated assemblies.

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Best of the NGC Blog

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Importance of fire-rating continuity in wood-frame assembly intersections

Find out how a lack of fire rating continuity affects your structure's safety and compliancy with building codes

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Shaft and area separation firewall assembly solutions

Solving challenges in fire-rated wood-frame assemblies

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Understanding shaftwall design in commercial construction

Get answers to 10 common questions about shaftwall and stairwell enclosures for commercial buildings

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How gypsum delivers fire-rated performance

Explore the science and history of gypsum, plaster and drywall

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Construction Services


Have a unique situation or application involving gypsum-based materials, finishing products or cement board? Call our experts at 1-800-NATIONAL for assistance. A free phone call from anywhere in the U.S. and Canada puts you directly in touch with National Gypsum’s technical information experts.

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