07:10PM | 04/25/02
Member Since: 04/24/02
1 lifetime posts

I had a contractor replace several of the used bricks that make up the exterior walls of my house. He used a gray mortar that he said would dry to white and match the existing mortar. It didn't.

Is there anything I can do to bleach the new mortar to match the existing mortar?

Thanks for any help.



06:04AM | 04/28/02
To match an existing mortar color can be a challenge. Here is what I would suggest:

1. Use a 4” angle grinder to remove the mortar ½”- ¾” deep in the areas that do not match.
2. If the old mortar is white. Use white mortar mixed with white masons sand.
3. Mix a small amount and let a sample dry or use a hair dryer to dry it more rapidly.
4. Check the color match. Adjust if necessary using regular mortar sand or coloring. (Coloring for concrete or mortar is available from any brick or architectural block supplier.)
5. When the match is found, tuck point the mortar into the areas that you previously removed.

This is the method we use all the time when an exact match is required.



02:06AM | 04/29/02
Member Since: 10/19/98
223 lifetime posts
The key here is letting it dry. Mortar changes color as it dries out and this could take a week or more, depending on weather conditions.
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