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Slate on Fire: Can it be Reused?

NSA Slate on Fire
July 30, 2023 at 12:00 p.m.

By Evelyn Witterholt. 

Learn all about how slate interacts with fire and if it can be salvaged afterwards. 

It’s common knowledge that slate is fire-resistant, but can it be reused after it interacts with fire? The answer is a bit complicated as there are many factors to consider, such as the condition of the slate or its proximity to fire. The National Slate Association (NSA) outlines all the considerations to make when it comes to reusing slate after a fire in their technical bulletin, “Reuse of Slate Shingles Exposed to Fire”

In the bulletin, the NSA outlines the impressive fire-resistant properties of slate roof tiles. For decades, slate roof shingles were considered effective against fire exposure. But in 2009, when it was called into question over whether or not slate was effective against fire when installed over combustible roof decks, the NSA performed further testing. 

The bulletin states that once fire tests were performed again, “Slate shingles installed over a combustible roof deck were once again recognized as having a Class A rating over combustible decks in the 2015 edition of the International Building Code.” 

Although slate tiles themselves will not combust, the question of whether slate exposed to fire can be reused still remains. According to the bulletin, there is no universally accepted answer. A lot of factors must be taken into consideration, including the type of slate used, its age or its condition. 

One consideration the NSA encourages you to take into account is the previous condition of the slate. They state that “a slate nearing the end of its service life, based on age or as evidenced by significant surface delamination, cracking, and broken corners on the exposed faces, is probably not a good candidate for salvage and reuse, regardless of whether it has been exposed to fire, or not.” 

Check out the entire technical bulletin from NSA to learn more about if slate can be reused after being exposed to fire.

Learn more about National Slate Association (NSA) in their Coffee Shop Directory or visit www.slateassociation.org.

About Evelyn 

Evelyn works as a writer for RoofersCoffeeShop, MetalCoffeeShop and AskARoofer. When she isn’t writing about roofing, she’s either at the gym lifting weights or curled up on the couch watching a movie. 

About the National Slate Association (NSA)

Early in 2014, the NSA met in Florida to discuss and define who we are and what we stand for. The last time this happened was in 2002, in Saratoga, New York. Before that, in Bomoseen, Vermont, 1922. Like all the best ideas, the answer was ultimately very simple: to promote slate in North America, and to promote the highest standards of materials and installation. This Purpose Statement was achieved after much discussion, a dialectic that reflected a deep respect for the tradition and history of slate, while looking to ignite a new fervor for a national heritage that has value and relevance to the future.



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