Subgrade Waterproofing

​Subgrade Waterproofing Services in the South Bay

​Protect Your Foundation from Costly Water Damage

At Ewell Construction, we specialize in subgrade waterproofing solutions that keep your home or building safe from water intrusion below ground level. Your foundation is one of the most critical parts of your property — yet it’s also the most vulnerable to moisture, leaks, and long-term damage if not properly protected.
With the South Bay’s coastal climate and variable soil conditions, investing in professional subgrade waterproofing ensures long-lasting protection against water seepage, mold, and structural deterioration.
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Why Subgrade Waterproofing Matters

  • Prevent Foundation Cracks & Shifting – Keep water from eroding soil and stressing your foundation.
  • Eliminate Mold & Mildew Growth – Stop moisture before it enters basements, crawl spaces, or slab areas.
  • Preserve Property Value – A dry, secure foundation increases long-term stability and resale value.
  • Save on Costly Repairs – Addressing waterproofing now prevents thousands in potential foundation and structural repairs later.
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​Our Subgrade Waterproofing Process

  • Inspection & Site Evaluation - We analyze soil conditions, drainage patterns, and existing foundation integrity.
  • Excavation & Preparation - We carefully expose the foundation walls to apply professional-grade waterproofing materials.
  • Membrane & Sealant Application - We install high-performance waterproofing membranes, sealants, and drainage boards to prevent water intrusion.
  • Drainage Solutions - We integrate footing drains, French drains, or sump pumps (if needed) to redirect water away from your property.
  • Backfilling & Final Check - Once sealed, we backfill with protective material and ensure proper grading for lasting protection.
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Why Choose Ewell Construction?

  • Local South Bay Expertise – We understand the soil, climate, and building codes unique to the area.
  • Proven Waterproofing Methods – We use premium materials designed for long-term performance.
  • Full-Service Solutions – From minor leak repairs to complete subgrade protection, we handle it all.
  • Licensed, Bonded & Insured – Giving you peace of mind from start to finish.
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FAQs – Subgrade Waterproofing

Q: How do I know if I need subgrade waterproofing?
A: Warning signs include water pooling near your foundation, damp walls in basements or crawl spaces, cracks in the foundation, or a musty odor indoors.

Q: Can waterproofing be done on an existing home, or only new construction?
A: Both. We provide solutions for new construction projects as well as retrofitting older homes with effective subgrade waterproofing.

Q: How long does subgrade waterproofing last?
A: With high-quality materials and proper installation, professional waterproofing can protect your foundation for decades.

Q: Will excavation damage my landscaping?
A: We take care to minimize disruption. Our crews work efficiently and restore the area after the waterproofing system is installed.
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Q: What’s the difference between waterproofing and damp-proofing?
A: Damp-proofing only slows moisture vapor, while true waterproofing blocks water under pressure. At Ewell Construction, we only install full waterproofing systems for complete protection.
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