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contributor authorHannah Carton
contributor authorBronwyn Chorlton
contributor authorJohn Gales
contributor authorEric B. Kennedy
date accessioned2025-04-20T10:23:46Z
date available2025-04-20T10:23:46Z
date copyright10/9/2024 12:00:00 AM
date issued2024
identifier otherJAEIED.AEENG-1751.pdf
identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4304639
description abstractWood as a building material is a common roofing material in both contemporary homes and older properties such as heritage buildings. As a combustible material, wood can be associated with higher rates of building damage from wildfires. This study investigates the spontaneous ignition of contemporary Eastern white cedar shingles (Thuja occidentalis), a commonly used roofing product in older houses and heritage properties in Ontario. The samples were tested with a cone calorimeter under radiant heat without a spark igniter. The samples were conditioned under three moisture content categories: (1) ambient; (2) dry; and (3) wet. They were tested using incident radiative heat for 15 min or until 2 min after flameout under three heat fluxes: (1) 20 kW/m2, (2) 30 kW/m2, and (3) 40 kW/m2. Moisture content and heat flux had a clear impact on ignition and pyrolysis. All samples ignited at 40 kW/m2 and the dry samples ignited at 30 kW/m2. In samples which did not ignite, indicators of pyrolysis such as off-gassing, charring, and ember formation were delayed as the moisture content increased. However, dry samples at 40 kW/m2 had a slower average ignition time by 20 s and a lower average peak HRR than the ambient samples by 8 kW/m2. It was posited that it could be due to the char layer forming faster at the lower moisture content, creating a protective layer that delayed ignition. Future research will investigate the impact of incident heat flux and moisture content on piloted ignition of cedar shingles via firebrands, which is common during wildfires. Research to evaluate the performance and ignition of heritage cedar shingles versus contemporary cedar shingles is also recommended.
publisherAmerican Society of Civil Engineers
titleFire Performance of Cedar Shingles under Radiant Heat
typeJournal Article
journal volume30
journal issue4
journal titleJournal of Architectural Engineering
identifier doi10.1061/JAEIED.AEENG-1751
journal fristpage04024039-1
journal lastpage04024039-10
page10
treeJournal of Architectural Engineering:;2024:;Volume ( 030 ):;issue: 004
contenttypeFulltext


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