We recently purchased a 27' AGP. The company outsourced the "free" install to a local company nearby. I found out that we have to provide for the cost of sand and concrete pavers, which amounts to $390. I guess I'm fine with this. I asked about upgrading to a foam bottom. The installer said it would cost an additional $690 for the foam bottom and foam cove. Or, the installer said I could purchase the foam components from my local hardware store, which would save me around $100 after I pay them to install it. The installer told me to buy 22 of the pink Owen Corning Foamular 4x8 sheets, but only in 1/2" thickness.
From searching numerous other foam posts, I haven't really seen anyone go with this thickness. Almost everyone goes with 1" or higher. Also, it seems like people either do sand OR foam over a leveled surface, not sand AND foam. So, why would the charge be $690 on top of $390 when they don't have to provide sand?
I just want to make sure I'm not getting screwed and that the price is in line with other installers. I'm also concerned about just the 1/2" thickness of the foam...should I go higher?