I laid these sandstone type slabs (used to be roof tiles on an old building) about 20 years ago. They are on a sound concrete base, the trouble is they keep expanding/contracting over time and the mortar breaks up (I must have replaced it 2 or 3 times over the years). Is there now a flexible sealant/grouting that will last, some of the spaces are 1 to 2 inches between slabs, the slabs are about 1 inch thick. The area is about 12 ft by 6 ft.
Flexible filling for between natural stone slabs
- Thread starter yottie
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imamartian
i'm no expert, but a two inch gap between slabs is huge??!!! can you not fill it with gravel?
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It's not the slabs expanding and contracting, it's the ground. If you use cement you will have problems as it's hard, and won't flex. Have a look at a firm called Whatco, they sell some flexible materials. They are also expensive.
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