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advice about 'black mortar' for 1920s house

Posted by kren_pa (My Page) on
Mon, Dec 17, 07 at 12:34

hello
i am wondering if anyone can advise me on the ingredients of "black mortar". the mason that will repoint our house has asked us to get the bags of mortar. he said, oh that's black mortar..i asked if he meant the color and he said well yes, it mixes up black but it's just called black mortar and it comes in 80 pound bags. called the concrete place in town and they had never heard of this. another person that looked at the house used the same term, "black mortar" and distinguished it from portland cement. anyone have any idea what this is? or who might carry it? thanks in advance.. kren


Follow-Up Postings:

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RE: advice about 'black mortar' for 1920s house

A Google search came up with the following:

If you are mixing a coloured mortar, add the cement dye to the dry aggregates and mix in thoroughly before folding in the gauging water. Alternatively, ready-mixed coloured mortars are available at most builders' merchants. We find that a black mortar, either made with a cement dye, or bought as a pre-pack, works well with natural stone and the riven types of patio flags, making the paving stand out, rather than the mortar. If using cement dye to make a black mortar, try to use a silver or very light coloured sands, as they require less dye to achieve a good black shade, than do the red sands.


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RE: advice about 'black mortar' for 1920s house

google for 'historic black mortar'. A number of hits come up. I'd also check the National Trust for HIstoric Preservation website - they have a wide variety papers on restoration subjects.


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RE: advice about 'black mortar' for 1920s house

Yup except try to use a 1-1-6 lime based historical mortar and dye it with black mortar colour, make sure your guy does a sample area for you, giving it a couple of days to dry out to its final colour and show his quality of workmanship. I usually do a wet test area first to match the colour which simply involves wetting down some of the original work and then match the colour of the new mortar which is also wet when first mixed up.
Cheers.


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RE: advice about 'black mortar' for 1920s house

You have to go to someone that carries brick, a concrete place will not be carrying mortar if all they do is concrete.


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