Natural Stone With Big Gaps - Grout? - Tiling, ceramics, marble - DIY Chatroom Home Improvement Forum

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Old 12-22-2010, 02:45 PM   #1
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Natural stone with big gaps - Grout?

Hi everyone
my first post, though I've found these forums to be extremely valuable over the past few years as I participated in the building of my house + other projects (so thank you!)

I've just mortared a bunch of natural stone to a small wall behind our woodstove (5' square). The stone is a sandstone-based material that we just went and found in the bush.

Being completely irregular in shape, the stonework has left some biggish gaps, some as big as 2" square. I am looking for the right product to use for grouting. The Mapei Keracolor S grout I have (leftover from tiling project) says it's for up to 5/8" gaps so I'm concerned it will crack in the bigger gaps here. I do not want to use the gray mortar between the rocks (aesthetics)- the rocks are reddish-brown. So I'm looking for brown-tone product.

Any suggestions on what product I should be looking for to do this job right?

Thank you very much!


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Old 12-22-2010, 06:46 PM   #2
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Sanded grout should do


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Old 12-22-2010, 08:31 PM   #3
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Seal the stone first. Natural stone will pull moisture and color from grout. Are you planning to trowel it in or use a mason's mortar bag?
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Old 12-22-2010, 08:50 PM   #4
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Make your own grouting material.

White Portland Cement
Silica Sand
Masonry Colorant.
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