The energy rater had estimated the house should score around 80 and in fact the house come in at 88 which is not very good. I am going to have an energy modeling done to see where I could have improved on some of my decisions. It has to be said, however, that I did the best I could working with subs etc. who had only vaguely heard of green building and had no interest in it beyond that. Energy modeling allows you to run hypothetical scenarios into the Energy Gauge software and see how your results come out differently based on changes you make. For example, my spray foam insulation only had a R value of 15 vs. the desirable R19. This I can't change of course but it will be helpful to see where I could have improved. In my reading I thought it did have the R19 value... so I'll learn more on that later. As for the FGBC checklist, with a HERS rating of 88 I will receive 24 out of the 74 maximum points for the energy category.
2 comments:
In the spray foams defense an R-15 of closed cell foam outperforms
R-19 by a long shot due to it's efficiencey. closer to an R-50 vs. fiberglass.
www.thefoampros.com
You'll have to explain that further-
A material’s R-value is the measure of its resistance to heat flow. The higher the R-value the more the material insulates against heat gain. The R-value is the R-value rating all insulation consistently. Not sure what you mean...
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