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Don't even try: Dry stone walls are designed to shift slightly with the weather and with freeze/thaw cycles. They also drain freely, and, barring getting damaged by a falling tree or an earthquake, will last a hundred years with little or no maintenance. There should be no soil between the stones, so either your contractor screwed up, or your gophers are ...


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The classic "definitive" solution is to use hydraulic cement. It expands as it cures, and modern versions also include various chemical addictive to improve post-cure waterproofness. Hydraulic cement is designed to fix exactly this problem. Standard epoxy is a terrible idea. It dries hard, becomes brittle faster than cement, and does not expand and ...


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You are experiencing seasonal groundwater fluctuations that causing the seepage through small cracks. If it only around the pipe, I suggest using a hydrophobic-expandable sealer to cut off the water path. The suggested product is shown below, but it is not the only one in the market. Preparation: Make a deep grove/slot around the pipe. Thoroughly clean the ...


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You can leave the sand and pour directly on it. Wet the sand down good prior to the pour. If you do not wet the sand as you dump loads of concrete dry sand will be picked up more not a good thing. I find welded wire mesh the best for thinner slabs, we used to mix bales of zonolite in our pool bottom and side wall mix I don’t remember the ratio but it worked ...


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