Matching Mortar


Old 10-30-18, 01:38 PM
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Location: USA
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Matching Mortar

Reinstalling a wood mantel on top of a stone fireplace. Need to replace the mortar between the two.

Trying to match old mortars, doesn't have to be exact. Current mortar has a higher white content in it than the gray stuff found everywhere. I know you can spray muriatic acid on it which I don't want to do because of it's location inside (fireplace).

I can't source "white mortar" anywhere around here big box or the trade houses. I've read that lime can whiten it up a bit. Thinking of using the gray that I have

with this

or maybe this would be better

Any suggestions, limits on amount, alternatives?


Last edited by Tumble; 10-30-18 at 01:57 PM.
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Old 10-30-18, 02:45 PM
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Hitting cement based mortar with muriatic acid really won't change it's color. It will dissolve the cement so it's often used for cleaning up mortar that's gotten where you don't want it but it's not great for changing the color.

I would ditch the big box home center and talk with local masons, lumber yard or search online for lime and mix your mortar. Big box home centers don't carry it but it's really easy to make/mix yourself. If you want to take it to the next level look carefully at your old mortar and see what color the sand is and find sand that is similar for your mortar.
Old 10-30-18, 06:57 PM
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Agree, big box store won't get you there. Seek out mason, brick dealers in your area. Take a sample of your current mortar to them and they can match. Unfortunately, you will have to buy a 70 lb bag of mortar to match, but it will get you closer than any other methods.

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