Breaker Boxes & External Foam Retrofit
BLUF: Do breaker boxes need to be bumped when installing external foam in a retrofit?
Background: Climate Zone 4C, 2-story home with 2×4 16″OC exterior framing and degraded fiberglass bats, with OSB and siding that is disintegrating in many locations. As we look into re-siding, we are reading about external foam (or wood fiber insulation if it becomes available in our region by the time the project happens). Unfortunately the duct work is in the vented crawlspace and the upstairs ducts go through the exterior studs, making some continuous exterior insulation all the more desirable. I’ve read the GBA articles on dealing with the windows (probably doing new construction triple panes in a outie design), but I’m having trouble finding info on how to deal with the breaker box. We’d be adding 1 3/8 to 2/38 of thickness (adding a rainscreen + 1-2 in foam). Do the breaker boxes, meter and the conduit need to be bumped out to sit on top of the siding (I am assuming yes which may be $$ given costs of involving electricians in my area), or can the foam and new siding be built around it?
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