Of the most resilient deep soil lifting foams, AP Deep Lift® 420 is a two-component, high expansion, hydro insensitive polyurethane foam. It’s also the top slab solution for polyurethane void fill. AP Deep Lift® 420 weighs 1.8 to 2.2 pounds per cubic foot. For similar products, see the page on Concrete Leveling.
The Deep Lift® Process Explained