ATLANTA — Georgia-Pacific announces the launch of DensDeck® StormX™ Prime Roof Board, the first high-performance gypsum roof coverboard (patent-pending) designed to help prepare commercial rooftops to hold tough under the dangers of impact and puncture caused by very severe hail conditions.

The product, which is classified for use in approved assemblies meeting FM Global’s Very Severe Hail Standard set in 2019, is available nationwide.

“DensDeck StormX Prime Roof Board is the premium choice in our product portfolio and the latest advancement in roof assembly preservation from Georgia-Pacific,” said Mikael Kuronen, director of product management, roofs, at Georgia-Pacific Building Products. “If your building is in a very severe hail zone or is frequently confronted by the intense moisture of hurricanes, you need a roof board that stands up to attack.

"This new option is classified for use in approved assemblies meeting the FM Global Standard for withstanding very severe hail, making it a stronger, more durable premium roof board. DensDeck StormX Prime Roof Board is your roof risk mitigator.”

Why DensDeck StormX Prime Roof Board? Geographical Applications?

Over the past eight decades, multiple factors have combined to raise the risk of experiencing a severe storm. More people and property are in the path of severe weather than ever before, with an estimated 75% of American cities experiencing a hail storm annually. Since 1960, there has been a 400% increase in weather-related disaster losses.

Through the benefits integration of DensDeck Prime with EONIC Technology and innovative product development, the use of DensDeck StormX Prime Roof Board helps enable structures to meet the FM Global Very Severe Hail Standard while simultaneously enhancing assembly protection. (See release notes for additional information).

“The unique combination of the GP legacy, plus the FM Global classification for Very Severe Hail, plus the extensive use applications combine to create a unique, premium, product choice,” said Kuronen.

DensDeck StormX Prime Roof Board is the perfect solution for structures within the Very Severe Hail zone, located across Arkansas, Colorado, Iowa, Kansas, Minnesota, Missouri, Montana, Nebraska. New Mexico, North Dakota, South Dakota, Oklahoma, Texas and Wyoming.

Proprietary engineering enables DensDeck StormX Prime Roof Board to not only prepare a roof to adapt to severe weather events, but to recover from them.

Trust the Georgia-Pacific Name

A dedication to advancement by Georgia-Pacific continues to bring new innovations to a product line with a noble history. Since its invention in 1987, DensDeck Roof Board has set new performance standards for roof assemblies. A dedication to advancement continues to bring new innovations to a product line with a noble history.

DensDeck StormX Prime Roof Board builds on this legacy by innovating on impact resistance. DensDeck StormX Prime Roof Board joins DensDeck Prime with EONIC Technology as the only gypsum roof board with manufacturing specifications that include 5% total water resistance by weight and 1 gram surface water absorption performance on both sides of the board.

For complete information on DensDeck StormX Prime Roof Board, to include technical specifications, please visit


Under the FM Global Standard, FM Global tests roof systems for moderate and severe hail impact resistance on how the systems withstand the dropping of a two-inch diameter 1.19 pound steel ball from either 8.1 inches or 141.5 inches.

The new Very Severe Hail designation uses an ice launcher to propel a two-inch diameter laboratory-made ice ball at 152-160 feet per second.

DensDeck® StormX™ Prime Roof Board is classified for use in approved assemblies that meet these rigid standards for impact resistance. Check for latest information on FM approvals.