Water occurring under slab
Water occurring under slab
(OP)
We have recommended a 2 ft over excavation and backfill with crushed limestone aggregate w/fines under a slab on grade for a building. However, there is either ground water or drainage occurring within the in situ soils. The soil is a fat clay/expansive.
I would think we would need to divert the water somehow, or possibly put some open graded rock(gravel) under the aggregate base. Thoughts?
I would think we would need to divert the water somehow, or possibly put some open graded rock(gravel) under the aggregate base. Thoughts?





RE: Water occurring under slab
f-d
¡papá gordo ain't no madre flaca!
RE: Water occurring under slab
RE: Water occurring under slab
f-d
¡papá gordo ain't no madre flaca!
RE: Water occurring under slab
RE: Water occurring under slab
Lastly that "vapor barrier" had better be a good one. Ordinary Visqueen is not good enough, especially with stakes driven thru it.
RE: Water occurring under slab
Mike McCann
MMC Engineering
RE: Water occurring under slab
Dik
RE: Water occurring under slab
We recommend dense-graded aggregate below all ground-supported slabs. It is less of a vapor barrier (i.e., capillary break), but much better for construction.
f-d
¡papá gordo ain't no madre flaca!
RE: Water occurring under slab
Also, someone on the project needs to consider the impact of vapor intrusion on floor coverings. I believe greater than 3 to 5 pounds per 1000 square feet per 24 hours is excessive for most varieties.
The completed slab can be tested for vapor intrusion...