fiberglass insulation in BCL?

answered 2018-10-24 11:14:09 -0500

updated 2018-10-25 11:27:32 -0500

Deleting my original answer; BCL has fiberglass continuous insulation, but not batts. The reason for this is thermal bridging from the studs and amount of continuous insulation will greatly change the effectiveness of batt insulation. You should instead use on the of pre-made construction assemblies that account for thermal bridging, or use CA Title 24 Appendix JA4 or ASHRAE 90.1 Appendix A values for overall assembly U-values for a given wall assembly. You can adjust the wall insulation material in one of the pre-made construction assemblies to get the target T24 or 90.1 value.

There is some discussion on whether to include a parallel path method for specifying constructions in EnergyPlus to account for assemblies like this that include batt insulation, but this is still a poor approximation given the 2D nature of heat transfer with studs.

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I have looked through this. I cannot find fibreglass insulation. The closest thing is "Glass Fiber - Organic Bonded", and I don't even know what is: https://bcl.nrel.gov/node/34590
Besides, a majority of this list in spanish: https://bcl.nrel.gov/search/site?f%5B...

re-measure ( 2018-10-25 10:14:16 -0500 )edit

Okay, I still can't find the continuous batts. Can you please link to the material page?

Thanks for the T24 and 90.1 suggestions, that's ultimately what I will have to use.

My apologies as I am a newb to Open Studio. The wall assembly I am trying to describe is a steel framed building, clad with what looks like standing metal seam siding, with 24" rib spacing, the fibreglass batts are placed between the ribs and then it is sided with another layer of corrugated metal siding. So basically 2 sheets of metal with some fibreglass between them.

re-measure ( 2018-10-25 17:15:11 -0500 )edit

Go to the BCL website (bcl.nrel.gov) and download the component Construction Assembly -> Wall -> Exterior Wall of Metal Building type for your ASHRAE 90.1 vintage and climate zone.