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Join Date: Nov 2009
Location: Chambersburg, PA
Re: Concrete/mortar question
Refractory mortar most likely will not do what you want to do. Refractory mortar is not like regular Type N, S or M mortars. It's a lot more runny. And fishkrane is right...the joints are more along the line of 1/8 of an inch in lieu of 3/8 of an inch. When using refractory mortar, it's more of a "smearing of the brick" instead of "buttering the brick." It will actually run off of the brick if you spread it on too thick. If you're looking for mortar to lay up stonework, you may just want to use a lime mortar and point it with Type N mortar.
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