repairing window sill mortar joints

2238 Views 4 Replies 3 Participants Last post by Jay2019, May 22, 2020

Jay2019

Discussion Starter · May 22, 2020

I am repairing some crumbling mortar joints on my window sill. As I remove the old mortar I notice that usually the 1/2" of mortar before I reach the window caulk is in good condition. Do I have to remove this 1/2" of old mortar right up to the window caulking or can the new mortar dry against the old mortar here? I'm just wondering about water penetration. Thanks

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Windows on Wash

· #2 · May 22, 2020

How good is "good" on the caulking? You'll need to get anything that is remotely loose out of there so that you can get a good bite on the new mortar.

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Jay2019

Discussion Starter · #3 · May 22, 2020

Windows on Wash said:
How good is "good" on the caulking? You'll need to get anything that is remotely loose out of there so that you can get a good bite on the new mortar.

The window caulking is in good condition and is not an issue. I'm wondering if the new mortar can be tuck pointed into the gap in the photo where I chiselled out the old loose mortar (there is still 1/2" of old mortar that is solid before the window caulking). Or do I have to remove all of the window caulk and completely remove all of the old mortar?

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