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Thatched Roof Shear Capacity?

Thatched Roof Shear Capacity?

Thatched Roof Shear Capacity?

(OP)
I have a project in Hawaii in which a African thatched roof will be used.  It uses compressed Berg or Mountain grass that is about 10-12" thick.  It is tied to 2" dia. purlins that are 10" on center and the purlins are supported every 3.5'.  I need the roof to have an allowable shear capacity of 200plf.  If I calculate the shear capacity ignoring the thatch I can only get about 40plf. The Thatching is pretty solid and stiff.  I know it must contribute to the strength and stiffness of the roof assembly.

I have been unsuccessful in finding any shear testing information although I know thatch roof construction is very common in some parts of Europe.

Anybody have experience with thatched roofing?

Thanks.

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