1950s to 1960 house with rock lathe (dry wall) covered with a grey brown coat (wire mesh in corners) and then a thin white plaster coat. Was used as a doctors office and we are putting back to the original floorplan (adding a laundry room). Plaster of Paris should work as the top skim coat, but does Any one know the formula of the sandy grey brown coat???

  • and where to get the glue to apply to new drywall ? – Chrisj750 May 13 at 13:34
  • I do not understand "glue for drywall" it has always been nailed to the framing. – Jack May 13 at 15:15
  • The "glue" is to increase plaster adhesion to the drywall – Chrisj750 May 13 at 15:20
  • The glue was the stickiness of the mix itself, much like thinset for tile – Jack May 13 at 15:24
  • I just use liquid nails or some other construction adhesive, I tend to remove the old lath and plaster and just use Sheetrock usually updating the wiring in each room as I go. – Ed Beal May 13 at 18:54

The brown coat s a very weak mix of mortar. Back in the day it may have been a specialized mix for stickiness, so it stuck to the rock lathe. You could use as an alternative a ready mixed mortar for stone veneer. All or at least many repairs I seen in homes with rock lath and plaster, were made by using metal lath, scratch coat, base coat, then white coat.

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  • thanks. Guess I will use the metal lathe and 3 coat method. It is time tested. – Chrisj750 May 13 at 15:26

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