Fire-resistance of Cross-Laminated Timber

CLT firetests 2


Canadian researchers recently put Cross-Laminated Timber (CLT), a somewhat new building product, to the test to determine fire-resistance properties. Their findings were:

The tests demonstrated that CLT assemblies can achieve significant fire resistance that is close to three hours in some cases with even unprotected CLT under full loading conditions. The failure modes were a mix of integrity and structural failures.

The (abbreviated) table below shows some of the results:

# of PliesThickness (mm)Gypsum Board ProtectionFire Resistance (min)
31142 x 12.7 mm106
31142 x 12.7 mm77
31051 x 15.9 mm86
51751 x 15.9 mm124


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