Modeling Asphalt Shingles and Felt Underlayment

Sushmit Shreyans · Post by **Sushmit Shreyans** » Wed Mar 03, 2010 7:42 am -1100

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 · Post by **Manfred Kehrer** » Wed Mar 03, 2010 8:16 pm -1100

Dear Sushmit,

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

Sushmit Shreyans · Post by **Sushmit Shreyans** » Thu Mar 04, 2010 4:06 am -1100

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

Manfred Kehrer · Post by **Manfred Kehrer** » Thu Mar 04, 2010 4:15 am -1100

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.