We are working on a raised patio project and need some help. The project includes removal of an existing wood deck, using a segmental retaining wall system to retain the elevation changes and build steps then installing pavers. I have two questions:
1) Beneath the deck they had used clear limestone gravel a couple of inches thick I would assume for weed suppression. We will be raising the area anywhere from 12-18" with compaction gravel. Does the clear gravel need to come out? Or can we regrade, compact and cover it with a geotextile to keep the two gravels seperate?
2) As part of this project the homeowner wanted a sleeve installed beneath the patio and walls in case his water line ever needed replaced. The home builder has this completed but not backfilled. Should the trench be filled with clear gravel or compaction gravel?
Edit:This discussion has been included in the site beginner's brick paving page.