Quote:
Originally Posted by niwell
When I worked with the Ontario Building Code a decade or so ago I got to see the results of flammability tests on mass timber / new wood composite beams. While not as good as a concrete masonry build it's quite a bit more survivable than light metal or even some steel beam construction. Tha latter will deflect to the point of structural failure long before a mass timber beam will go up in flames - they're quite survivable.
Stick buildings aren't really bad once complete either - it's the construction phase that's dangerous. As mentioned above though I'd avoid due to moisture concerns, as well as lack of noise attenuation.
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Do you know what the loss of moment strength is for mass timbers like CLTs after their outside layers get charred?