Fiberboard Sheathing Used For Waterproofing?
We are building on a hill and there is a concern with having a dry basement since it is a walk-out and will be finished. To address this, the builder has put a thick coating of tar on the exterior cinderblock walls. Now over that they have attached GP Stedi-R Regular Fiberboard Sheathing. In reading about this product on their website, it states it is for above-ground applications as underlayment under wood, vinyl, aluminum, etc.
Is there any benefit to using this below-grade as a waterproofing agent? I had asked the builder about using something like Miradrain, but this is not what I had in mind. Besides that, it has been applied with gaps of 1 - 2 inches between panels. Does anyone know anything about using the product in this manner? I've contacted Georgia Pacific about this, but haven't heard back from them yet and I hate to let them backfill until I know if it should be left like this.