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Pointing Mortar Mix dicko 05-29-2008
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Posted by dicko on May 29, 2008, 10:58 pm

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

Posted by ransley on May 29, 2008, 11:42 pm
> 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? =A0I 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. =A0I ready to put the new mortar and bricks
> back in.
>
> -dickm

Besides the joint has to be clean, acid and a powerwash work

Posted by John Grabowski on May 30, 2008, 6:24 am

>
> 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


The correct way to do pointing is to have the existing mortar tested for its
exact ratio of sand, lime, and cement. You need to take samples from
several sections as the mix may have changed with each batch during the
original construction. Once you know the correct ratio, you mix your own to
the same specifications.


Posted by Don Young on May 30, 2008, 9:55 pm

>
> 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
I don't know anything about types of mortar mix but I do know that any
mortar or cement repair job will not last long if the mortar or cement dries
out too quickly. You will need to dampen the repair area before the mortar
is put in, protect it from sun and otherwise keep it damp for as long as
possible. Misting the area afterward can help, once the mortar has set up
enough.

Don Young



Posted by DanG on May 31, 2008, 7:10 pm
You don't indicate the age of the structure or type of brick used.
IF you put high compressive strength mortar with very old bricks,
you will destroy the bricks. The strength of the mortar is
subject to the ratio of Portland, lime, and sand. The color is
most affected by the color of the sand.

--
______________________________
Keep the whole world singing . . . .
DanG (remove the sevens)
dgriff237@7cox.net



>
> 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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