What material should I use to fill the footprint of my new home ?
As seen in the attached photograph the new home (near Brockville, Ontario, Canada) is being built 100% on granite bedrock. The site slopes to the west . That is the right-hand side of the photograph. There are two drains (4" diameter) located on the footings on the west side.
The home will have a 4" concrete slab on 2" of rigid insulation (taped). This will sit on the fill. At the east and north sides of the homes, the fill will be perhaps 1 foot thick. At the west side, the fill will be perhaps 4 feet thick.
My concern is that water will enter the footprint and saturate the fill. The fill could freeze during the winter and heave the concrete slab. This could happen during the building process before there the walls and the roof are covering the fill.
I presume that the fill should permit easy drainage of the water to the two 4" drains on the west side. Should I use Granular "A"(with fines), Granular "B"(with fines), sand, 3/4" clear gravel (no fines), or some combination?
Posted Nov 2, 2012 3:40 PM ET
Edited Nov 2, 2012 3:50 PM ET
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