[Greenbuilding] Insulating brick unframed envelopes

[Jason Holstine]

We are trying to tackle a holy grail‹insulating old brick-front homes
without covering or redoing the exterior brick.
Buildings are vintage 1890-1950. Typically brick with plaster interior and
that¹s about it. These are often rowhouses with rear extensions (not
bricked), so it¹s typical that we¹re only talking about doing 1 or 2 sides
of the building.

It¹s in the DC/MD region in the heart of mixed-humidness, but it¹s
noteworthy our winters are getting harsher. This is a concern I have.

We¹d like to avoid framing out the walls to minimize the loss of floor
space. So, we¹re thinking about air sealing then insulating on the interior
with 2² foam board or mineral wool 2² board (R8). In either case, the plan
is to attach sleepers and drywall right on top. We figure this isn¹t ideal
but is certainly an improvement.

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?

How nuts is this plan?
If we go foam board, how imperative is closed-cell or open-cell?
If not using closed-cell foam board, should we apply a vapor-smart weather
barrier on the inside of the brick first?

Bonus question: Any risk of also insulating bricked party walls that show
leakage?

Thanks,


Jason Holstine


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