Detailing wood framed parapets
I’m looking for anyone who has some parapet detailing experiences or opinions to share! Context is a wood framed 2-unit residential building with a flat roof with a TPO membrane, continuous rigid insulation and a parapet wall.
Typically, in a wood (or light-gauge steel) framed parapet situation, you seem to have two options to resist the wind loads on the parapet:
1. Diagonal kickers extending back from the parapet to the roof. It seems like these will cause a headache from a continuous insulation and roof membrane detailing standpoint.
2. Balloon frame the parapet wall. This causes a headache regarding moisture control. It seems that it requires that you use blocking and spray foam to form an air-barrier and vapor-retarder between conditioned space and the parapet like in figure 14 here: https://www.buildingscience.com/documents/insights/bsi-050-parapets-where-roofs-meet-walls
I think I’m leaning towards option 2, but I’m curious if anyone else has any experience with other options or approaches. Of if anyone has any experience with the details where the diagonal kickers, continuous insulation, and roof membrane all interact.
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