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Clay Plaster on new Drywall  RSS feed

 
pollinator
Posts: 189
Location: Penticton, Canada
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building rocket stoves woodworking
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I am looking at covering my newly hung drywall with a local clay plaster: 1 part clay: 3 parts sand : 1 part fibre.
I have done experiments on some practice pieces to ensure it will adhere OK. Some with a flour/ sand and/or clay precoat to see which one adheres the plaster to the drywall best.
So I am wondering if it is necessary to tape my drywall joints since the plaster will be put on almost a half inch thick when finished the 3 coats or will cracks eventually show up at the joints if I don't tape them?
 
Gerry Parent
pollinator
Posts: 189
Location: Penticton, Canada
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building rocket stoves woodworking
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Decided not to risk it and taped the joints.
 
pollinator
Posts: 240
Location: Northern New Mexico, Zone 5b
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It's good that you taped the seams. The plaster will crack along the joints if you don't. Good surface preparation is key to any plaster.
 
Posts: 209
Location: ALASKA
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You definately needed to tape the joints.  I would almost go as far as telling you that you probably should use stucco mesh wire as well.  Your plaster may or may not adhere properly, especially over time, when it is just smeared on basically a smooth surface such as drywall.  
 
Posts: 614
Location: Bendigo , Australia
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I would experiment with scratching the surface of the drywall, to create a ' key' for your clay mix.
 
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