Old Victorian with no sheathing – Insulating walls but code requires fire blocking
Hi all. I have read Martin Holladay’s article (https://www.greenbuildingadvisor.com/article/insulating-walls-in-an-old-house-with-no-sheathing), and related newer articles here (https://www.greenbuildingadvisor.com/article/managing-water-and-insulating-walls-without-sheathing) and here (https://www.greenbuildingadvisor.com/article/insulating-old-walls).
One thing all of these articles have in common is that they assume the stud bay can extend vertically from floor to ceiling, or in the case of my grand old 1890 Victorian home (Oakland, California) with balloon framing, from basement to attic. Unfortunately, when I pull out the lathe and plaster walls to “gut retrofit” my wall assemblies and insulate them, my local code will be requiring the addition of fire blocking every 8 ft high and at the floor and ceilings of every floor.
What are your suggestions on achieving good vapor permeability and dry-out of stud bays that have substantial horizontal fire block interruptions in each stud bay cavity? I have some ideas, but I want to hear what folks much more experienced than I have to say about it! Thank you.
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