My Father (a senior) has an above grade (1 to 12 inches above) stone patio deck. The previous owner used pressure treated small railroad type ties to hold the stone's substrate (fine powder) in place. Over time the ties have worn out and the substrate has moved, causing the patio stones to shift downward.
What inexpensive repairs can be done to:
A. hold in the substrate beneath and in between the patio stones
B. that also won't buckle any deck retaining wall or lumber
The house sit on a down steep sloping grade, it has a covered deck (20x10 approx.), that extends just short of the where the old ties sat at the base of the deck.
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