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Trying to match old mortar DJW 04-26-2008
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Posted by DJW on April 26, 2008, 2:25 pm
I have a 55-year-old cut squared block stone house. The stone is in
need of tuck-pointing in some areas.

First off is it called tuck-pointing when it is not brick but stone?
The other thing is how do I go about to try to mix matching mortar? It
looks like a lot of aggregate (sand) was used in the motor.

Is there a good site about how to mix mortar to match old mixes? Or is
there a service where I can send a piece of the mortar and get a
formula for its mix. Because of its age am I actually seeing it aged
in color too and a pigment may be needed also? Is there mortar that is
only lime and no cement? Help!

Posted by ransley on April 26, 2008, 7:28 pm
> I have a 55-year-old cut squared block stone house. The stone is in
> need of tuck-pointing in some areas.
>
> First off is it called tuck-pointing when it is not brick but stone?
> The other thing is how do I go about to try to mix matching mortar? It
> looks like a lot of aggregate (sand) was used in the motor.
>
> Is there a good site about how to mix mortar to match old mixes? Or is
> there a service where I can send a piece of the mortar and get a
> formula for its mix. Because of its age am I actually seeing it aged
> in color too and a pigment may be needed also? Is there mortar that is
> only lime and no cement? Help!

Talk to local masons , cement yards, a city paid architect-free, For
my Indiana Limestone it took White portland and tint, plus it should
not be harder than the stone itself. Its a real tough job to match
it , but ive done it 20 times. Research with your city, and go for it
done right.

Posted by beecrofter on April 26, 2008, 8:38 pm
> I have a 55-year-old cut squared block stone house. The stone is in
> need of tuck-pointing in some areas.
>
> First off is it called tuck-pointing when it is not brick but stone?
> The other thing is how do I go about to try to mix matching mortar? It
> looks like a lot of aggregate (sand) was used in the motor.
>
> Is there a good site about how to mix mortar to match old mixes? Or is
> there a service where I can send a piece of the mortar and get a
> formula for its mix. Because of its age am I actually seeing it aged
> in color too and a pigment may be needed also? Is there mortar that is
> only lime and no cement? Help!

Make a soft mortar with 2 -3parts lime to 1 part portland and 8 parts
sand. portland comes in white or gray. If you can dissolve out a
sample of the existing mortar with acid you can get a better look at
the sand originally used.

Posted by DJW on April 27, 2008, 9:29 am
>
> > I have a 55-year-old cut squared block stone house. The stone is in
> > need of tuck-pointing in some areas.
>
> > First off is it called tuck-pointing when it is not brick but stone?
> > The other thing is how do I go about to try to mix matching mortar? It
> > looks like a lot of aggregate (sand) was used in the motor.
>
> > Is there a good site about how to mix mortar to match old mixes? Or is
> > there a service where I can send a piece of the mortar and get a
> > formula for its mix. Because of its age am I actually seeing it aged
> > in color too and a pigment may be needed also? Is there mortar that is
> > only lime and no cement? Help!
>
> Make a soft mortar with 2 -3parts lime to 1 part portland and 8 parts
> sand. portland comes in white or gray. If you can dissolve out a
> sample of the existing mortar with acid you can get a better look at
> the sand originally used.

What would I be using to try to devolve the sand out?

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