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ICC Completes Mass Timber Fire Safety Tests

Thursday, August 3, 2017

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The International Code Council Ad-hoc Committee on Tall Wood Buildings has completed five full-scale mass timber fire tests as research that will inform code changes to tall wood buildings, a building technique that’s growing in popularity.

In cooperation with The U.S. Forest Service’s Forest Products Laboratory, the tests provided five scenarios in two identically furnished one-bedroom apartments constructed of cross-laminated timber at the Bureau of Alcohol, Tobacco, Firearms, and Explosives’ Fire Research Laboratory, in Beltsville, Maryland.

American Wood Council

The International Code Council Ad-hoc Committee on Tall Wood Buildings has completed five full-scale mass timber fire tests as research that will inform code changes to tall wood buildings, a building technique that’s growing in popularity.

According to the American Wood Council (a partner that helped fund the study) scenarios included:

  • Test 1: A mass timber structure fully protected with gypsum wall board was subjected to a large furnishings and contents fire. The test was terminated after three hours without significant charring on the protected wood surfaces of the structure.
     
  • Test 2: Approximately 30 percent of the cross-laminated timber ceiling area in the living room and bedroom were left exposed. The test was terminated after four hours, providing additional time to determine if there would be any significant fire contribution from the exposed CLT. Notably, once the furnishings and contents had been consumed by the fire, the exposed CLT essentially self-extinguished due to the formation of char that protected the underlying wood.
     
  • Test 3: Parallel CLT walls were left exposed, one in the living room and one in the bedroom. Similar to Test 2, once the apartment furnishings and contents had been consumed by the fire, during which a protective surface of char formed on the CLT, the mass timber surfaces essentially self-extinguished.
     
  • Tests 4 and 5: Examined the effects of sprinkler protection. For both tests, all mass timber surfaces in the living room and bedroom were left exposed. Test 4 demonstrated that under normal operating conditions, a single sprinkler easily contained the fire. For Test 5, the fire was allowed to grow in the compartment for 23 minutes before water was supplied to the sprinklers, which quickly controlled the fire.

“The results of these fire tests will continue to be studied and will help inform code change recommendations from the Ad-hoc Committee later this year,” said Stephen J. DiGiovanni, P.E., Ad-hoc Committee Chair and Fire Protection Engineer for the Clark County (Nevada) Department of Building and Fire Protection.

“These tests are an important part of the extensive research data the Committee has reviewed to validate the performance of tall wood buildings.”

   

Tagged categories: Fire; ICC; Regulations; Wood

Comment from Jesse Melton, (8/3/2017, 10:11 AM)

"...Essentially self-extinguished." Essentially is one of my favorite meaningless words.

I do not understand what is driving this push for tall wooden buildings. It's backwards and, frankly, bizarre. Like sacrificing a goat before the witch burning every Saturday at the community center.

I can't see any good coming from this.


Comment from Trevor Neale, (8/3/2017, 11:27 AM)

I would also be concerned about termites.


Comment from Jesse Melton, (8/4/2017, 7:07 AM)

I didn't even consider termites! Does carbon stay sequestered in the wood after being processed by a termite?

I wonder what the lifespan of these buildings will be? Assuming they don't all burn or get eaten by termites.


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