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Mississauga's Trusted Exterior Basement Waterproofing Company

When water keeps coming through the wall, the real fix is outside. DrainCom digs down to the footing, seals the cracks, and wraps your foundation in a waterproof membrane so water never reaches your basement.

Call 905-238-6800
Request Your Free Inspection
  • Confidential
  • Takes 5 seconds
  • No obligation

Why Mississauga Homeowners Hand Us the Shovel

DrainCom is the

No. 1 Rated

choice for licensed and insured basement waterproofing services in Mississauga, Canada.

We’ve protected Mississauga foundations for years, so we know your local soil, your older housing stock, and how water behaves against a basement wall after a hard spring thaw. We inspect the property, find where the water is really getting in, then recommend the right exterior solution – nothing you don’t need.

Our licensed specialists have waterproofed more than 20,000 homes, with over 700,000 feet of membrane and weeping tile installed. When we say we’ve dug up a foundation like yours before, we mean it.

Call us at 905-238-6800

for a free drain inspection and quote, or fill out the request form at the top of this page.

What Homeowners Say About DrainCom

Every Exterior Waterproofing Service Your Foundation Needs

Drainage membrane on a foundation wall in an open trench during exterior basement waterproofing

Basement Excavation and Wall Exposure

Many Mississauga basement leaks trace back to waterproofing that failed years ago. We excavate around the basement to expose the wall and reach the damaged area. That lets us fix the problem at its source, before water reaches your basement.

Exterior Foundation Crack Repair

Freeze-thaw cycles and natural settlement open cracks in your foundation wall, and those cracks let groundwater seep in. We repair and seal foundation cracks from the outside, stopping water before it ever crosses into your home.

Waterproofing Membrane Application

Old waterproof coatings wear out after years of moisture and shifting weather. We apply a high-performance membrane straight onto the foundation wall, from footing to grade. It forms a seamless barrier that keeps water away from your basement.

Delta MS Drainage Board Installation

Mississauga’s clay-rich soil traps moisture against foundation walls. A Delta MS drainage board creates an air gap that guides water down to the weeping tile. It eases moisture buildup and shields your waterproof membrane at the same time.

Exterior Weeping Tile Repair and Replacement

Plenty of older Mississauga homes have clogged or broken weeping tile. When drainage fails, water pools around the foundation and pressure climbs against the walls. We repair or install weeping tile to get proper drainage working again.

French Drain System Installation

Poor yard drainage leaves water sitting around your foundation after heavy rain. We install French drain systems across Mississauga that capture that water and carry it well away from your property. Less soil saturation means less pressure on your foundation.

Window Well Repair and Drainage

A window well that won’t drain fills with rainwater, and then water leaks through the basement window into finished space. We handle window well repair in Mississauga, fixing the drainage so water moves away safely and future leaks are far less likely.

Backwater Valve Installation (Outside)

Heavy storms can overload Mississauga’s sewer system and raise the risk of sewage backup. An exterior backwater valve blocks wastewater from flowing back toward your home. It’s one more layer of protection when the weather turns nasty.

Parging and Foundation Wall Restoration

Foundation walls crack, chip, and wear down as they age. Parging restores the surface and helps guard the wall against moisture and weather. It tidies up the look of your foundation, too.

Yard Grading and Backfilling

Poor grading sends rainwater toward your house instead of away from it. We backfill with the right materials and reshape the ground so water drains off. That keeps water moving away from your foundation all year.

What a Sealed Foundation Makes Possible

Skip the repeat repairs — solving it at the source means no more chasing the same leak every spring.
  • Finish the basement with confidence — build a family room, home office, or gym knowing water won't undo the work.
  • Add a rental or in-law suite — a dry, structurally sound foundation is the base for a legal basement apartment where permitted.
  • Protect your biggest investment — a waterproofed foundation guards the structural value of the whole house.
  • Store without worry — keep furniture, seasonal gear, and valuables safe from moisture and mould.
  • Sell with proof — a documented exterior system and transferable warranty give buyers real confidence at closing.
  • Skip the repeat repairs — solving it at the source means no more chasing the same leak every spring.
Worker fastening a dimpled membrane roll to a foundation wall for exterior basement waterproofing

How Much Exterior Basement Waterproofing Costs in Mississauga

Exterior waterproofing across the GTA usually runs from $150 to $400 per linear foot. It costs more than interior work because you’re paying for excavation, wall prep, membrane, drainage board, weeping tile, and full yard restoration. In return, you get a complete, permanent fix that stops water before it reaches your foundation.

Service Approximate Cost (CAD)
Exterior Waterproofing $150 – $400 per linear foot
Foundation Crack Repair (up to 5 ft wide / 9 ft deep) $1,800 – $3,700
Window Well Repair (Regular) $1,900 – $3,500
Sump Pump + Tank $2,200 – $3,500
Exterior Backwater Valve Installation $2,400 – $3,500
Weeping Tile Replacement (Exterior) Free quote — priced per linear foot

These are approximate ranges for typical residential projects. You get a detailed written estimate after your free on-site inspection, and the price we quote is the price you pay.

💰 City Rebate Alert: Backwater valve and sump pump installations bundled into your exterior project may qualify for Mississauga Basement Flooding Subsidy. We explain what’s available and prepare the paperwork during your inspection. Rebate amounts and rules change, so we confirm what’s current before you commit.

What Shapes Your Exterior Waterproofing Quote

Every home is different, so the final number depends on your foundation and the work it needs. We’ll walk you through all of it during the free inspection.

Membrane and sock-wrapped drain pipe on a foundation wall during exterior basement waterproofing

Excavation depth

Deeper foundations mean more digging, labour, and equipment.

Foundation condition

Cracks, deteriorated parging, or damaged concrete may need repair before waterproofing starts.

Accessibility around the home

Decks, porches, walkways, driveways, and landscaping can complicate the dig.

Soil conditions

Mississauga’s heavy Peel clay holds moisture and is slower to excavate than loose or sandy soil.

Waterproofing materials

The membrane, drainage board, and protective coating you choose affect the total.

Drainage upgrades

Replacing weeping tile, adding a sump pump, or installing a backwater valve widens the scope

The Ground Truth: Why Mississauga Foundations Leak

Mississauga sits on heavy Peel clay, with pockets of clay and shale near the Credit River and a high water table close to the Lake Ontario shoreline. Pair that ground with our weather and a lot of aging homes, and foundation water problems show up more here than in many parts of Ontario.

Exterior basement waterproofing services including excavation, membrane application, and drainage system installation
  • Peel clay and shale — dense local soil holds water and pushes it hard against your foundation after rain.
  • Lake Ontario water table — homes closer to the shoreline deal with groundwater sitting high beneath the slab.
  • Heavy rainfall — intense storms saturate the ground and overwhelm home drainage fast.
  • Spring snowmelt — melting snow raises groundwater and the risk of seepage right along with it.
  • Freeze-thaw cycles — with frost reaching roughly four feet down, repeated freezing widens foundation cracks winter after winter.
  • Aging weeping tile — older systems across Mississauga clog or collapse and stop draining.
  • Poor surface grading — a yard sloping toward the house funnels rainwater straight to the foundation.

Exterior waterproofing stops these at the source. It builds a waterproof barrier and routes groundwater safely away from your foundation.

Red Flags That Say It's Time to Call an Exterior Waterproofing Contractor

Ignore the early signs and a small foundation leak becomes an expensive repair. Spot any of these? Book an inspection.

Black dimple board drainage membrane wrapped around concrete foundation footing exterior GTA home
  • Water leaks after heavy rain — often a sign the exterior system has failed.
  • Foundation wall cracks — exterior cracks let groundwater through and only get worse.
  • Damp or musty basement — persistent moisture means water is finding a way in.
  • Peeling paint or efflorescence — white powder or flaking finishes point to moisture moving through the concrete.
  • Wet spots near foundation walls — damp patches along the perimeter often signal outside water intrusion.
  • Pooling water around your home — standing water raises hydrostatic pressure and leak risk.
  • Damaged or aging parging — cracked, crumbling parging leaves the wall exposed.
  • Repeated basement leaks — if leaks keep returning after repairs, the fix likely belongs on the outside.

How We Waterproof Your Foundation, Step by Step

Worker in a shored trench laying gravel and membrane during exterior basement waterproofing

Free inspection

We check your foundation walls inside and out, look over the drainage, find the cracks, and pin down where water is getting in.

Permits, where required

When a permit is needed, we pull it before work starts. Every project follows the Ontario Building Code.

Excavation

We dig down to the footing along the affected walls, protecting plants, walkways, driveways, and nearby structures as we go.

Wall cleaning and crack repair

We clean the exposed wall, seal every crack with hydraulic cement, and let it cure before waterproofing.

Membrane application

We apply a continuous, high-performance waterproof membrane from footing to grade — a seamless barrier against water.

Drainage board installation

A Delta MS or equivalent board goes over the membrane to protect it and channel groundwater into the weeping tile.

Weeping tile repair or replacement

We inspect the system, repair or replace it as needed, and connect it properly to the storm drain or sump pump.

Backfilling and grading

We backfill with clean soil, compact it in layers, and grade the surface so water drains away. Your yard is restored as neatly as we can manage.

Final walkthrough and testing

We verify the drainage connections, check the system, and walk you through the finished work before we leave.

The Long-Term Payoff of an Exterior Seal

Increases property value — a professionally waterproofed foundation gives buyers confidence.
  • Stops water before it reaches your basement — the barrier blocks water outside the foundation, heading off leaks and flooding.
  • Protects your foundation — keeping water away reduces cracks, settlement, and long-term structural damage.
  • Reduces hydrostatic pressure — proper drainage relieves pressure against the walls.
  • Prevents mould and mildew — a dry foundation makes it harder for mould to take hold.
  • Extends the life of your system — quality membrane and drainage keep protecting your home for the long haul.
  • Increases property value — a professionally waterproofed foundation gives buyers confidence.

Why DrainCom Is Mississauga's Go-To Waterproofer

  • 20+ years of exterior waterproofing experience

We’ve helped homeowners across Mississauga protect their foundations with proven exterior solutions that last.

  • A track record you can check

More than 20,000 homes waterproofed. Over 300,000 linear feet of foundation walls sealed. 700,000 feet of membrane and weeping tile installed. 800+ reviews on HomeStars at a 9.9/10 rating.

  • 25-year transferable warranty

Most of our exterior systems carry it, so you get long-term protection that follows the home if you sell.

  • Licensed and experienced specialists.

Our crew uses professional excavation methods, premium materials, and proven installation techniques — and treats your yard like their own.

Request Your Free Inspection
  • Confidential
  • Takes 5 seconds
  • No obligation

Top Rated Waterproofers just a call away!

Business Hour:
Monday to Friday: 8a.m -9p.m
Saturday and Sunday: 9a.m – 2p.m

Call 905-238-6800

Frequently Asked Questions

It stops water before it reaches your foundation. The job includes excavation, crack repair, a waterproof membrane, and a drainage system that keeps your basement dry from the outside in.

Most projects run $150 to $400 per linear foot. The final cost depends on your foundation, excavation depth, and the drainage work required. You get a written estimate after a free on-site inspection.

It depends on the problem. Exterior work stops water outside the foundation, while interior basement waterproofing work manages it after it reaches the drainage system. We’ll tell you honestly which one your home actually needs.

 A professionally installed system protects your home for decades. Most DrainCom exterior projects include a 25-year transferable warranty.

Yes. Excavation exposes the foundation wall so it can be repaired, waterproofed, and protected with a new drainage system.

 Most projects wrap in three to seven days. Larger homes or complex digs may take longer, and we’ll give you a clear timeline after the inspection.

Yes. A dry, protected foundation improves buyer confidence and helps preserve your home’s long-term value.

Yes. We repair cracks before the membrane goes on, which helps stop future water intrusion.

Many do. Older homes often have worn-out coatings and aging weeping tile that no longer protect the foundation.

Watch for basement leaks, foundation cracks, damp walls, musty odours, and water collecting around your foundation after rain. Any of those is worth a free inspection.

Fast. Draincom offer 24/7 emergency service and work across Mississauga daily, so we can usually get a crew to you quickly, even on short notice.

We do. We’re a licensed contractor, our qualifying installs meet the requirements, and we prepare the documentation so you’re not chasing paperwork yourself.

Ready for a Dry Basement? Start Here

Don’t wait for a small foundation leak to turn into a major repair. Our team will inspect your property, find the source, and recommend the right exterior waterproofing solution for your home.

You’ll get honest advice, a detailed written estimate, and zero pressure to move forward.

Book Your Free Basement Inspection
Call 905-238-6800

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