Trusted Basement Waterproofing & Foundation Repair Since 2006
Why Choose Down Under Waterproofing?
Down Under Waterproofing has helped over 2,000 homeowners solve basement waterproofing issues, foundation problems, and structural concerns throughout New Jersey and Eastern Pennsylvania. Based in Robbinsville, NJ, we understand the soil conditions, drainage challenges, and seasonal weather patterns that commonly cause basement leaks and foundation damage in this region.
We provide basement waterproofing, foundation repair, crawl space encapsulation, drainage solutions, and structural repair services designed specifically for local conditions. Every project is focused on identifying the root cause of the issue and delivering a long-term solution — not a temporary fix.
We are fully licensed, bonded, and insured, and we believe in fixing problems the right way the first time. Our team provides honest recommendations, clear communication, and long-term solutions without high-pressure sales tactics.
We proudly serve homeowners in Morris, Monmouth, Middlesex, Mercer, Somerset, Hunterdon, Ocean, Bergen, Essex, Union counties in NJ, along with Bucks County and Montgomery County in Pennsylvania.
Our Location
Our Services
Professional French drain installation, sump pump systems, foundation crack repair, and basement moisture control services throughout New Jersey.
Foundation repair services in New Jersey including bowing wall repair, failed footing stabilization, underpinning, brick and masonry repair, foundation wall replacement, historic foundation restoration, and basement dig-outs (floor lowering).
Structural repair services in New Jersey including sill plate replacement, floor leveling, termite damage repair, rotted wood replacement, and installation of support columns, beams, girders, and floor joists.
Building envelope waterproofing services in New Jersey including commercial caulking, waterproof coatings, and flashing installation to protect against water intrusion.
Crawl Space Encapsulation
Unsealed dirt crawl spaces allow moisture, mold, mildew, and pests to thrive. Our crawl space encapsulation services in New Jersey create a clean, dry, and protected foundation environment.
Doors-Windows
Professional Bilco door and basement egress window installation in New Jersey, improving safety, accessibility, and home value.
Professional traditional stucco and EIFS (Exterior Insulation and Finish System) repair, installation, and replacement services throughout New Jersey.
Professional repair, full rebuilds, and new installations across New Jersey.
Professional masonry services in New Jersey including brick repair, repointing and tuckpointing, step construction and replacement, block work, and chimney brick restoration.
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Latest Projects
Latest Basement Waterproofing Tips
Basement Waterproofing Tips & Foundation Repair Advice
Helpful resources for homeowners in New Jersey and Eastern Pennsylvania
Explore the Down Under Waterproofing blog for expert advice on basement waterproofing, foundation repair, crawl space moisture control, sump pump systems, drainage solutions, and warning signs homeowners should never ignore.
Our articles are written for homeowners across Central New Jersey and Eastern Pennsylvania, with practical guidance based on local soil conditions, seasonal weather, and the most common causes of basement leaks and structural damage in the region.
Read our latest posts to learn how to spot early signs of trouble, prevent costly water damage, and make informed decisions about protecting your home’s foundation.