Whats Kyanoil ?
-----Original Message-----
From: John Horton <[log in to unmask]>
To: [log in to unmask]
<[log in to unmask]>
Date: Wednesday, November 17, 1999 4:02 PM
Subject: Plaster woes


>I posted this query to preservation-l a while back and got some good
>response. I thought I'd toss it out to the BP wolves also to gnaw on a bit.
>I appreciate any comments.
>
>I'm currently consulting with a circa 1924 gothic revival church that has
>been abandoned for over 20 years. The roof leaked for some time along the
>gable end parapets (flashing and cement coping failure) and subsequently
>damaged the interior plaster. The walls are interlocking hollow clay tile
>with a brick veneer and plaster directly on the tile. Random testing
>suggests that most of the plaster is sound and could be preserved. The
>original finish on the plaster was a calcimine which was later painted over
>with multiple coats of oil paint. Of course the oil paint can be brushed
off
>with a feather and will be easy to remove.
>
>I am planning to have the paint removed, the calcimine scrubbed down, and
>the rotted plaster chisled out. The remaining plaster will be repaired,
>leveled out and repainted. My question is: what would be a good finish
>coating on the plaster? I do not want any coating that would block moisture
>or water vapor. My feeling is that without any membrane in the wall and
high
>exposure, I would like the wall system to breathe. There will be some
>repointing of the brickwork, but overall the mortar is in pretty good shape
>except up near the parapet. Would a BMC be appropriate? Or is there a
>specific product for this type of application? Someone suggested using
>calcimine again, but I worry about long term maintanence, especially if
some
>future building committee decides to repaint the interior - unknowingly
with
>latex.
>
>Would it be worth considering consolidation of the surface to prevent any
>future problem with the remaining calcimine? I've used Kyanoil for this in
>the past with good results. Would any consolidant defeat the purpose of the
>breathable coating by sealing the plaster too much? What would be a good
>consolidant to use?
>
>John Horton
>
>"Sometimes I feel like I've been tied to the wippen post."
>