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Pointing Mortar Mix
First a bit of history. My Chimney has been pointed twice in th e10 years I've owned my house. The first time about 9 years ago, the second about 3 years ago. The first time, it looks like the guy just scraped out about 1/4" of mortar and filled it back in. Now that thin layer of new mortar is falling out. However, its still hard as a rock. The second time, just a few spots were patched but the mortar used looks like it has turned to sand and is disintegrating. I've been able to remove a few bricks where this is happening. I figure I can do just as good a job as the "professionals" who screwed it up before so I'm going to give it a try. The question I have is what type of mortar is used? I see the home centers sell a type N mortar mix and a type O mortar mix. Type N being stronger and is used for exterior walls and type O being weaker and is sometimes called pointing mortar. So far I have all the affected joints cleaned out to about 3/4 inch depth, and all the old mortar has been cleaned from the few bricks that I was able to remove. I ready to put the new mortar and bricks back in. -dickm |
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