Renovation Services
Drainage & Waterproofing
Protect your home from Seattle's rain — French drains, foundation waterproofing, sump pumps, and water damage repair.
Get a Free AssessmentPNW Water Intrusion Specialists
Keep Seattle's Rain Outside Where It Belongs
Seattle averages 37 inches of rain per year — and much of it ends up where you don't want it: against your foundation. Water intrusion is the #1 cause of structural damage in Pacific Northwest homes, and most homeowners don't discover the problem until significant damage has already occurred.
Ergo Construction specializes in diagnosing and permanently solving water intrusion problems. We don't just patch symptoms — we identify the root cause and install the right drainage or waterproofing solution for your specific property.
Our Drainage Work
Every stage of the drainage and waterproofing process — documented and done right.
Services We Provide
Comprehensive water management solutions for Seattle homes and properties.
French Drain Installation
Perforated pipe systems surrounded by gravel, installed to redirect groundwater away from your foundation.
Foundation Waterproofing
Interior and exterior waterproof membranes, dimple board, and sealant applied to keep water out permanently.
Foundation Crack Repair
Injection grouting and structural repair of foundation cracks before they become water intrusion problems.
Fundation Water proofing
Most effective and permanent way to prevent basement flooding once and for all
Water Damage Repair
Assessment, drying, and full restoration of water-damaged framing, drywall, insulation, and flooring.
Our Drainage Process
We diagnose, plan, and execute permanent solutions — not temporary patches.
Free Assessment
We inspect your foundation, grading, downspouts, and interior moisture levels to identify all water intrusion sources.
Solution Design
We recommend the right combination of drainage, waterproofing, and repair — with a transparent, itemized quote.
Excavation & Prep
Careful excavation around foundation walls or interior concrete saw-cutting to access drainage areas.
Installation
Drain pipes, gravel beds, waterproof membranes, sump pits, and pump installation — all to code.
Restoration
We backfill, restore concrete, and return your space to normal — often better than before we started.
Frequently Asked Questions
How do I know if my foundation has a water problem?
Warning signs include efflorescence (white mineral deposits) on basement walls, damp or musty smells, standing water after heavy rain, cracks in foundation walls, and peeling paint or rust stains. If you see any of these, call us for a free assessment.
What's the difference between interior and exterior waterproofing?
Exterior waterproofing addresses the problem at the source by excavating around the foundation and applying a waterproof membrane. Interior systems manage water after it enters, using channels and sump pumps. We recommend the right approach based on your specific situation.
Is drainage work covered by homeowner's insurance?
Water damage from sudden events (like a burst pipe) is often covered. Gradual seepage or drainage issues are typically not. We can document the damage and help you understand what to submit to your insurer.
How long does drainage installation take?
A French drain installation typically takes 1–3 days. Fundation water proofing and crack fixing takes much longer time for the concrete and sealant to cure.
Worried About Water in Your Home?
Get a free assessment. We respond within 24 hours.