I have a slate patio on my house and slate steps in my front and back yard. The slate has been coming loose from what I believe is the concrete beneath them. I have tried repairing them with masonry compound and even gorilla glue. The masonry compound did not work at all, the gorilla glue worked temporarily.
Sounds like you have a moisture/temperature issue. A good epoxy should be able to readhere these tiles. Unfortunately, a good epoxy can fail if it is too cold, or too wet. Ideally you need to have a few fair weather days in a row to properly cure the epoxy. If the weather doesn't work in your favor, sheild the repair work from rain or moisture as best you can until week has passed.
I have the same question about repairing slate steps. My situation is that there is set-stone beneath the steps, is it possible to mortar to the set stone and then mortar the seams or is there a better way.
The slate steps at the front door of my church are breaking off in pieces where the steel hanrails are attached. Short of cutting the stone and pouring cement in its place, is there any way to repair the joints or reattach the railings to the slate?
Slate is not strong enough to safely support railings and the reasonable use and abuse you have to expect. The leverages involved are way too high for anything that fragile, and you may have some building code violations there, which could invalidate your insurance.
Patch the cracks with liquid stone, a rock-dust filled epoxy, and move the railing supports to just beside the steps. The cheapest fix usually is to drive 1" galvanized pipes 3-4 feet into the ground and welding the railing stanchions to them.
When patching the stone, make sure it is warm through and through, otherwise you are wasting expensive epoxy.
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