[Greenbuilding] Exterior insulation retrofit
elitalking at rockbridge.net
Wed May 18 06:58:22 PDT 2011
Exterior Finish Insulation System does provide the exterior finish, thereby
reducing the cost of another finish. I know dryvit had a class action
lawsuit that was settled for bulk water drainage problems. Ultimately the
solution was to assume imperfections in the flashing installation and manage
the water by overlaying a building wrap on original wall with a drainage
space maintained. My question is does that drainage space on the
conditioned side of the insulation create a convective path for air leakage?
In the best of all worlds, the building wrap would be a perfect air barrier.
Just as with the bulk water flashing, perfection is hard to achieve. Could
that be a source of air leakage from the building?
In my installation, I located the bulk water drainage outside the insulation
with 3/4" osb furring strips for siding screws. I attempted to seal between
the insulation boards to achieve tight air barrier. I also added a
redundant building wrap layer to do the same. Both were vulnerable to
imperfections. However, there is no known hole on conditioned side.
----- Original Message -----
From: "John Straube" <jfstraube at gmail.com>
To: "Green Building" <greenbuilding at lists.bioenergylists.org>
Sent: Tuesday, May 17, 2011 9:42 AM
Subject: Re: [Greenbuilding] Exterior insulation retrofit
> Being done all the time in North America. Although this really only got
> common in the last decade. I expect to see a lot more.
> The problem is, you have to like the look of stucco, which is not always
> what is wanted, and the impact resistance of EIFS leaves lots to be
> On 2011-05-17, at 9:27 AM, Norman Feldman wrote:
>> In April I heard an architect describe how they're using EIFS insulation
>> in Germany and Austria to insulate existing buildings from the exterior.
>> They apply EIFS panels to the outside of the building while tenants are
>> in the building then, once the insulation is done, bring the windows out.
>> I will forward more about this offlist if anyone wants.
> Dr John Straube, P.Eng.
> Associate Professor
> University of Waterloo
> Dept of Civil Eng. & School of Architecture
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