So my proposed building is done. I'm working on my baseline building and a little confused on how to model the baseline building envelope/exterior.

This project is a renovation in climate zone 8. Most of the interior walls remain.

All the original roof structures remain , All exterior walls remain. No new exterior walls were constructed.

All exterior walls received a 5-1/2" EIFS system. All roof structures received 8-1/2" foam system buildup with new 2" klip-rib style metal decking.

The only thing that didn't remain on the envelope was the existing decking and all windows and doors got replaced.

The proposed building is modeled to reflect all this in equest - it is very close.

The building was a chapel and it will remain a chapel (non-residential/religious worship).

So here's the question...

In the baseline model, do I model the pre-existing configuration or do I change all the wall systems completely to match Appendix G, table 5.5-8?

Table 5.5-8 sais the exterior walls, above grade, should show steel framed.

Also, with regard to the roof, would the baseline roof need to be modeled as it was originally, taking into account the energy usage that the building would have had without the foam buildup we added.

Or would I need to just go off of table 5.5-8 again? - in my case the baseline would be "insulation entirely above deck" from that table.

OR should I just do parametric runs to tweak the baseline values down to be in compliance??

What would be an acceptable practice given the nature of the renovation and that the existing building remained?

Chris Baker
CCI CAD Drafter

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