Basement and Garage Backfill: Gravel vs. Sandy Fill
I’ve run into an issue with my excavators that has me puzzled. Until this point they have undoubtedly been accommodating and done a fantastic job with the complex build that we have going on. I am at the point where the basement and garage are backfilled and compacted. I arrived to the site to find that they backfilled the basement and garage to grade, and did not put the gravel that I expected to put under my poly and insulation. Given that we are in a unique situation I am inclined to ask for your opinions before a costly and annoying request to removed compacted fill and replace with gravel.
Our home is built in central Massachusetts (Zone 5) in an area with a high water table (1 ½’ down) and on a slope with a walkout basement. To make the lot buildable, we have brought in 3,000 yards of well draining sandy fill (yes three thousand). Plus the backfill and the septic. I have included a diagram of what is happening. My excavator states that since we are built on well-draining fill with a full perimeter drain that discharges twice and with all gutters run into the perimeter drain he does not see a reason to bring in gravel at a higher cost when the fill is already well draining and we are above the water and have gone to such extremes to avoid water issues.
My question is, Should I make them remove the fill and put in the gravel or are they correct not to sweat the added expense of the gravel and making them remove it?
GBA Detail Library
A collection of one thousand construction details organized by climate and house part