Question-and-Answer Resource for the Building Energy Modeling Community
Get started with the Help page
Ask Your Question

How is the U-factor estimated for insulation cases classified as 'None' or 'Uninsulated' within the ResStock tool, and what assumptions or default values are used in this estimation process?

asked 2024-03-30 21:11:18 -0500

Mia's avatar

updated 2024-03-31 09:19:23 -0500


I was just curious to know how ResStock treats cases like 'Insulation Ceiling' with Option=None or Uninsulated. As defined in options_lookup.tsv, it was assumed for that case: ceiling_assembly_r=0 and ceiling_insulation_r=0. So, how the U-factor is estimated for such cases? I am looking to use buildstock generated by ResStock and its options_lookup.tsv for a different modeling tool.

Also, I was wondering if it is possible to reproduce the same buildstock as 2024.1 Release or 2022.1 Release.


edit retag flag offensive close merge delete

1 Answer

Sort by ยป oldest newest most voted

answered 2024-04-02 11:34:59 -0500

For any given wall, there is a wall_assembly_r in options_lookup.tsv. For example, it's R-3.4 for an uninsulated wood stud wall. However, note that a siding R-value (e.g., here) and/or continuous insulation R-value (e.g., here) can get added to it.

If you want to confirm the overall assembly R-value (or U-factor), you can find it directly in the HPXML file that is produced for a building with a specific set of parameters. It would look something like this and will include interior and exterior air films.

edit flag offensive delete link more


@shorowit ... Thank you so much for the information!

Mia's avatar Mia  ( 2024-04-16 12:34:28 -0500 )edit

Your Answer

Please start posting anonymously - your entry will be published after you log in or create a new account.

Add Answer

Training Workshops


Question Tools

1 follower


Asked: 2024-03-30 18:58:47 -0500

Seen: 94 times

Last updated: Apr 02