Any NYC Sparkies in the House

chefwongDecember 21, 2009

Just short of taking the Hilti to it, I'm trying to determine what is the wall construction of my wall is . I can hear the adjacent resident next door. I'm in a old bldg in Chelsea, NYC. The primary wall is 5/8 sheetrock on what appears to be plaster of some sorts underneath. The plaster seems to be around 3/4 to 7/8 thick. However, when I took a sheetrock saw to it, cutting a 4 inch square, there did not appear to be lathe holding it.

However, after cutting the full square, the plaster would not budge. It's as if it has a *concrete slug* if I'm coining the term right, behind it.

I am trying to locate studs behind this plaster wall and I suspect there is none ? Behind the plaster, there appears to be only 1.5 inch at most of free space.

My next plan to to knock out the 4" squre I cutout and confirm if there is cinder block behind this ?

I've asked our landlord and super and both are unsure what is holding this plaster wall up.

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terribletom

I'm not a New York sparky but...

If I had to guess based on the information given, the original wall may have used "rock lath", which was a hard substrate popular in the 30s and 40s. It came in narrower sheets (sometimes 16" or 20" wide) and was grooved to accept a plaster finish coat. Given that there is about 1.5" of free space behind it, it was very possibly attached to 5/4" or 6/4" furring strips.

Concrete board (ca. late 40s/early 50s) is another possibility.

    Bookmark   December 24, 2009 at 12:14PM
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