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Air barrier
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Ed May
Partner, Building-Type LLC

Hi Jason,

I wouldn't rely on your denspack cellulose on its own to provide airtightness to the Passive House levels. While it's certainly true that denspack cellulose will help your airtightness overall, that kind of insulation should always be coupled... (More)

Devon Basher
Director of Eco Energy Options, NJ, USA

Hi Justin,

Hope you are well! Maybe this one is in the books. My thinking with a flat/low slope roof as described (and many assemblies with no or low outward drying capacity and hygroscopic inboard insulation) is that a taped... (More)

Ed May
Partner, Building-Type LLC

Hey Justin,

If you are using air-permeable insulation like cellulose I think you'd want to comply with the IBC's 1202.3.5.139 in that case, right?:

Insulation shall be located in accordance with the following:
5.1: Item 5.1.1, 5.1.2, 5.1.3 or 5.1.4... (More)

I agree with Ed May‘s response. Section 5.1.2 applies to your scenario. However, I think you are also asking about the assembly order, to IRMA or not to IRMA, and who installs the XPS?

My opinion is that the XPS... (More)