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Hi Everyone,

We just purchased a 120 year old house full of plaster walls. We were removing the painted over wallpaper and discovered some brick and decided to expose it. What would be your recommendation to fill in the gaps between the existing plaster walls and the brick? Should I just go with pre-mixed plaster of paris and/or plaster patching or is there something better you would recommend? We'd like to make it so that it is seamless where the plaster meets the brick. I've included pictures (need to be rotated vertically since they were uploaded horizontally).

Thanks for your help!
 

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Guapo
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First, you have to remove any loose pieces of concrete & plaster. By that time, the gap maybe be fairly large. At that point you can decide what to use. A backer rod with plaster or mortar maybe be a possibility.
 

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The best way for a straight line down the brick would be to use a USG # 200-B Metal trim installed against the brick than skim coated on to the existing plaster.
For your plaster repair materials for that age home you should use a Gypsum based base to fill the deep areas than skim coat with a Veneer plaster. If you do use the metal bead you will have to skim out about maybe 18 inches so as not to leave an edge. A good product for the fill material would be a Product like USG Structo-Lite Gypsum Plaster & Gold Bond has the same product Gypso-Lite both are mill mixed & just require the addition of water. If you sift the Gypso-Lite thru a screen wire mesh you could get by with troweling it smooth. If you will need to Skim a complete wall to make it smooth look into using a good top of the line veneer plaster like Master of Plaster it will make your walls smooth as glass. You will not get good results by using Plaster of Paris by it self if you select to go that route mix Plaster of Paris with a Finish Lime like Ivory Finish Lime or Snowdrift Finish Lime Mix 2 lime to 1 Plaster of Paris working time 20 / 40 min. depending on temp.
 
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