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Fire Safety of CLT Buildings with Exposed Wooden Surfaces
RISE - Research Institutes of Sweden, Safety and Transport, Safety.ORCID iD: 0000-0002-7663-1525
RISE - Research Institutes of Sweden, Safety and Transport, Safety.ORCID iD: 0000-0002-8001-401x
2018 (English)Conference paper, Published paper (Other academic)
Abstract [en]

An increasing number of tall buildings made of CLT have been built in recent years. Current architectural trends involve having visible timber surfaces in these tall CLT structures. This results in new fire safety challenges, especially because fire service interference is increasingly difficult for increasingly tall buildings.

 

Recently, a number of research projects involving large scale compartment fire testing studied the development of fires in (1) compartments with a fully encapsulated CLT structure and (2) compartments with exposed CLT surfaces. The studies have shown that sufficient gypsum board protection can avoid the involvement of CLT in a fire. However, fall-off of the base layer of gypsum boards during can result in continuous fires that do not extinguish without fire surface interference, as during fall-off large areas of initially protected timber surfaces start to contribute as fuel to the fire.

 

If CLT is exposed to a fire, fire induced delamination of CLT (also lamella fall-off or char fall-off) could occur due to weakening of bond lines within the CLT. During fire induced delamination the exposed lamella falls from the CLT and a new relatively cold timber surface becomes exposed to potentially high temperatures, which effectively makes additional fuel suddenly available to a fire.

 

Very recent studies involved the development of CLT products that are not subject to delamination. The studies indicate that the use of (a) sufficient fire protection, (b) CLT products with thermally resistant adhesives and (c) a limit regarding the surface area of CLT that can be exposed, result in fires that decay and eventually self-extinguish.

This paper reviews the studies and includes a summary of conclusions.

Place, publisher, year, edition, pages
2018.
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-36537OAI: oai:DiVA.org:ri-36537DiVA, id: diva2:1266158
Conference
4th Forum World Building Nordic Växjö
Available from: 2018-11-27 Created: 2018-11-27 Last updated: 2019-06-27Bibliographically approved

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Brandon, DanielJust, Alar

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CiteExportLink to record
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