Wall Assembly Review - Zone 5 - GreenBuildingAdvisor

Wall Assembly Review – Zone 5 Steve2132 | Posted in General Questions on February 13, 2026 08:49am Hello Everyone, First let me say I have really enjoyed the content here and the Q&A’s.I realize a good amount of my wall assembly considerations have been covered but I wanted to throw out there where I am at and get opinions because I am not dead set yet. I am in Zone 5 (SW Michigan). Below is what I am thinking. Outside to in:-Vinyl siding-Vertical rainscreen furring strips-2″ Polyiso foam board-7/16″ zip sheathing-R-21 unfaced batt insulation (2×6 studs)-Drywall-Latex paint Now my Q’s:-First any glaring issues with this assembly? -Is it recommended to add a textured drainage plane between the zip and the exterior foam?  -Should I use foil faced polyiso? Open to other changes/ideas. I am owner building this and trying to balance cost and labor while working toward a decent wall assembly. Thanks -Steve Answer GBA Detail Library A collection of one thousand construction details organized by climate and house part Search and download construction details Join the leading community of building science experts Become a GBA Prime member and get instant access to the latest developments in green building, research, and reports from the field. Start free trial Related Questions Roof Assembly Review Wall Assembly Climate Zone 5 Wall Assembly in Climate Zone 5 with stucco Wall assembly for Zone 5 Replies [email protected] | Feb 13, 2026 12:17pm | #1 I'm curious if vinyl on furring st...