Radon Retrofit Difficulty Due to Existing Slab Condition

Older New Jersey basements in Morris, Sussex, and Hunterdon Counties frequently test above the EPA action level of four picocuries per liter but have cracked, thin, or patched slabs that render sub-slab depressurization retrofits ineffective. Suction points leak and mitigation systems underperform.

A basement floor lowering project rebuilds the slab from scratch over fresh aggregate, a new vapor barrier, and a radon-ready stub-up, which ensures that any future mitigation system will achieve full suction across the basement footprint.