How effective is bagging and what would be the best material for the application? At The International Pool, Spa, and Patio Expo last year, Lew Akins gave seminar on The Anatomy of a Million Dollar Pool, where he briefly discussed his process of supporting sections of a pool raised out natural ground. He referred to the technique as bagging, which are stacked bags of limestone and/or cement as the center support. Then, shot the pool floor on top with walls/footings around the sides. Should there be a concern with the bag material deteriorating over time, causing the limestone to settle?
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I have done it twice. The first time, we had a wet spot on a shallow end bank. This led to the bank falling into the pool. We dug out the dirt to an elevation below the bottom of the floor concrete. We then filled FIBERGLAS sacks with 3/4" gravel, folded the tops, and laid them flat in the caved area. This built up a bank to shoot against and moved the invading water down to the 6" gravel layer under the pool. Sunlight causes the fiberglas material to degrade. In this situtation, once the deck is in place, the fiberglas will never see the sun again.
I have used the techinique to build a retaining wall in a fountain excavation. The wall went in a ring and we filled the center with gravel. We laid the bags 3,2,and one on top. The covering concrete kept the sun away from the fiberglas bags.
These jobs are over twenty years old.
Rob