Excavation Systems
Exterior Foundation Waterproofing in Calgary
Full excavation, membrane, and drainage board that stops water at the outside of the wall before it ever reaches your basement.
Exterior Foundation Waterproofing Done Right in Calgary
If you need exterior foundation waterproofing in Calgary, water is likely seeping through the foundation wall itself rather than just at the floor. Exterior waterproofing is the most complete solution because it stops water on the outside of the concrete, where the original builder-grade damp proofing has usually failed after decades in Alberta soil.
We excavate down to the footing, clean and repair the wall, apply a rubberized waterproof membrane, add a dimpled drainage board, and install or replace exterior weeping tile before backfilling. The result is a foundation protected the way a new build should have been.
What's Included
- Careful excavation to the base of the foundation footing
- Wall cleaning, parging, and repair of cracks and voids
- Rubberized or peel-and-stick waterproof membrane application
- Dimpled drainage board to relieve hydrostatic pressure
- New or replacement exterior weeping tile with clean gravel
- Backfill, compaction, and basic grading restoration
Common Signs You Need This Service
- Seepage through the middle of the wall, not just the floor
- Damp patches or bubbling paint high on the foundation
- Old asphalt damp proofing that is cracked or peeling
- Negative grading that slopes water toward the house
- Persistent leaks that interior patches have not solved
- Efflorescence spreading across large wall areas
Our Process
- Inspection and locatesWe inspect the exterior, confirm the leak height, and call utility locates before any digging.
- ExcavationWe dig down to the footing along the affected wall, protecting landscaping where possible.
- Wall repairWe clean the wall, parge voids, and inject or seal any structural cracks.
- Membrane and boardWe apply the waterproof membrane and dimpled drainage board across the wall.
- Drainage and backfillWe lay new weeping tile in clean gravel, then backfill, compact, and restore grade.
Methods & Options Compared
Exterior systems vary by the membrane used and the drainage detail. We match the specification to your soil and budget.
| Membrane type | How it works | Best for |
|---|---|---|
| Rubberized liquid membrane | Sprayed or troweled seamless coating that spans hairline cracks | Most residential foundations |
| Peel-and-stick sheet membrane | Self-adhesive sheet for consistent thickness on flat walls | New builds and full-wall protection |
| Dimpled drainage board | Creates an air gap and channels water down to the weeping tile | Added over membrane in wet, clay-heavy sites |
What Affects the Price
Exterior waterproofing is the most involved option, so pricing depends heavily on access and depth:
- Depth of the foundation and volume of soil to be excavated
- Access for equipment versus hand digging in tight lots
- Linear footage of wall being treated
- Condition of the wall and extent of crack or parging repair
- Landscaping, decks, or walkways that must be removed and restored
Local Calgary Considerations
Many Calgary homes built before the 1990s were finished with a thin asphalt damp proofing that was never designed to hold back water under pressure. Combined with expansive clay in areas like Bowness, Braeside, and Acadia, that original coating fails and lets water through the wall. Exterior waterproofing replaces it with a modern membrane system built for our soils.
Why Choose Us
Why Calgary Trusts Waterproofing Pros Calgary for Exterior Foundation Waterproofing
Membranes Built to Last
The modern membranes we apply are rated for decades of service, far beyond the thin builder damp proofing they replace. We install to manufacturer specification so the warranty holds.
Restoration Included
Our quote includes backfill, compaction, and grade restoration. We leave your yard tidy and sloped away from the house, not as an open trench you have to finish yourself.
We Fix the Source
Exterior work stops water before it touches the concrete. Rather than managing water after it enters, we keep it out of the wall entirely, which is the most durable fix available.
Social Proof
What Our Customers Say
Water was coming in along the basement floor every spring. They installed an interior weeping tile system and sump, explained every step, and the basement has stayed bone dry since. No pressure, honest pricing.Kendall M.Calgary NW
Had two foundation cracks injected. Crew showed up on time, sealed everything in a morning, and cleaned up after. Fifteen years transferable warranty gave us real peace of mind.Dave R.Airdrie
After the spring melt our crawl space smelled musty and damp. They encapsulated it and added a sump. Huge difference in air quality upstairs and our energy bill actually dropped.Priya S.Cochrane
FAQ
Frequently Asked Questions
Is exterior waterproofing worth the extra cost over interior?
When water is seeping through the wall itself, or when the original damp proofing has failed, exterior waterproofing is the most permanent solution because it keeps water out of the concrete entirely. For simple floor-joint leaks, an interior system is often more cost effective.
Will you damage my landscaping?
Excavation does disturb the area along the wall. We protect what we can, keep the work zone tight, and restore backfill and grade. Complex hardscaping or mature plantings are discussed in your quote before work begins.
How deep do you dig?
We excavate to the base of the footing so the entire wall and the weeping tile can be treated. Depth depends on your foundation, commonly six to eight feet on a full basement.
Can you combine exterior work with new weeping tile?
Yes. While the excavation is open we routinely replace failed exterior weeping tile and set it in clean gravel, which is the ideal time to do it.
How long does an exterior job take?
A typical single-wall project takes three to five days, and a full perimeter can take a week or more depending on access, depth, and restoration.
Related Services
Foundation Damp Proofing
Moisture control coatings and barriers that stop dampness, condensation, and humidity before they turn into mold and musty air.
Learn more →
Weeping Tile Installation & Repair
New interior and exterior weeping tile that captures groundwater and carries it safely to a sump before it reaches your basement floor.
Learn more →
Foundation Crack Repair
Low-pressure polyurethane and structural epoxy injection that seals leaking foundation cracks permanently, usually in a single visit.
Learn more →Get Your Free Exterior Foundation Waterproofing Quote
We will inspect, diagnose the source, and give you a fixed written price with a transferable warranty.
Get a Free Quoteor call (587) 550-0000