Modeling Asphalt Shingles and Felt Underlayment

[Sushmit Shreyans]

I wanted to know how to model asphalt shingles and felt underlayment for a roof. Is it included in the Material Database (Asphalt impregnated paper/Building paper/Bituminous Paper).

[Manfred Kehrer]

Dear Sushmit,

just use a vapor retarder with sd=1500m from the database

[Sushmit Shreyans]

What should I use for modeling Asphalt Shingles? Is the Asphalt impregnated paper equivalent to Shingles?

[Manfred Kehrer]

Just make the Asphalt impregnated paper thicker and it should work.

I think only the following is important:

bulk density and thickness are rough known.
use vapor tightness (µ value about 10000)
use no capillary transport.