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We are trying to tackle a holy grail—insulating old brick-front homes without covering or redoing the exterior brick.<BR>
Buildings are vintage 1890-1950. Typically brick with plaster interior and that’s about it. These are often rowhouses with rear extensions (not bricked), so it’s typical that we’re only talking about doing 1 or 2 sides of the building.<BR>
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It’s in the DC/MD region in the heart of mixed-humidness, but it’s noteworthy our winters are getting harsher. This is a concern I have.<BR>
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We’d like to avoid framing out the walls to minimize the loss of floor space. So, we’re thinking about air sealing then insulating on the interior with 2” foam board or mineral wool 2” board (R8). In either case, the plan is to attach sleepers and drywall right on top. We figure this isn’t ideal but is certainly an improvement.<BR>
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A main concern is that insulating the brick walls may lead to brick damage, but how much of this is germane only to cold climates?<BR>
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How nuts is this plan?<BR>
If we go foam board, how imperative is closed-cell or open-cell?<BR>
If not using closed-cell foam board, should we apply a vapor-smart weather barrier on the inside of the brick first?<BR>
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Bonus question: Any risk of also insulating bricked party walls that show leakage?<BR>
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Thanks,<BR>
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Jason Holstine<BR>
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