Slate roof

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IMPACTMC
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Slate roof

Post by IMPACTMC »

Hello,
I'm trying to model a slate castle roof nailed onto oak sheathing without an air gap. How can I define the water vapour diffusion and porosity of this material :roll: ?
Thanks
Christian Bludau
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Re: Slate roof

Post by Christian Bludau »

Hi,

the only values for the slate roof I found where in a German research report. In there for a slate roof teh following effective sd-values where given:
Natural slate sd = 3,5 m
Synthetic slate sd = 6 m
You can use this sd-values directly as a sd-value in the surface transfer coefficients instead of creating a layer.

Christian


Source of values: Winter, S.: Technische Regeln zur Volldämmung von Altdächern mit unterschiedlichen Dachdeckungen (außer Dachsteindeckung). IZH-Forschungsbericht. März 1994.
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