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Lynn Javoroski
Senior Member
Username: lynn_javoroski

Post Number: 251
Registered: 07-2002
Posted on Wednesday, November 09, 2005 - 10:55 am:   Edit PostDelete PostPrint Post

We are installing new lighting in a church sanctuary and will be cutting holes in acoustic plaster installed in 1965. I'm assuming that it is gypsum plaster (but I could be wrong about that). The Owner wants to paint all the plaster after the holes are patched. I'm afraid that paint will destroy the acoustic qualities of the plaster.
I suggested that we ask the contractor to cut out large sections of the plaster panels, then cut the smaller holes for the lighting. The larger pieces could then be replaced and patched around, leaving a less visible "seam" to touch up. I'm told there are already areas where the plaster has been patched, however, and the Owner would like to restore the monolithic, one color look.
Is there a paint out there that would work? Any other ideas?
Brett M. Wilbur CSI, CDT, AIA
Senior Member
Username: brett

Post Number: 71
Registered: 12-2004
Posted on Wednesday, November 09, 2005 - 11:03 am:   Edit PostDelete PostPrint Post


this may or may not be relevant, but I was just researching the same issue in regards to field painting of Tectum. I found this bulletin that describes their requirements for maintaining the acoustic properties of that material. You can find it at:


Hope that helps.
Dave Metzger
Senior Member
Username: davemetzger

Post Number: 143
Registered: 07-2001
Posted on Wednesday, November 09, 2005 - 04:10 pm:   Edit PostDelete PostPrint Post

In my limited experience with acoustical plaster, they can be either gypsum based or portland cement based.

It's not easy to patch an existing installation, and get a match in either texture or color. And for an installation dating back to 1965, asbestos may be an issue.

There are various manufacturers of acoustical plaster. The manufacturer would be best source for information on painting or otherwise trying to get a uniform color in a patched existing installation. I'd think that the thicker-bodied (and more uniformly colored) the paint, the more detrimental effect it would have on the acoustical performance of the plaster.

We have specified Pyrok Acoustement for various projects. URL is www.pyrokinc.com

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