Foundation Waterproofing in Newmarket — Exterior, Done Right

We do exterior foundation waterproofing in Newmarket — the kind that actually solves a wet basement instead of hiding it. That means digging down to the footing, scraping the wall clean, applying a real membrane, replacing the weeping tile, and backfilling with drainage stone. Newmarket’s clay-heavy soil holds water against your walls for weeks after every storm, and interior patches only buy time. Call us at 416-317-3090 for a free site visit and a written quote.

Why Newmarket Basements Leak

Two patterns drive most of the wet-basement calls we get in Newmarket. The first is the 1970s and 1980s Glenway housing stock, where the original parge coat and spray-on damp-proofing have aged out — they were never true waterproofing membranes, and after 40-plus winters they crack, flake, and let groundwater straight through. The second is the newer Stonehaven, Summerhill, and Woodland Hill builds where the original weeping tile gets crushed or silted up, or where lot grading has settled and now slopes water toward the house.

Layer Newmarket’s heavy clay subsoil on top of that and you have a foundation wall sitting in a wet sponge for most of the spring. Clay does not drain — it holds. Hydrostatic pressure pushes water through every hairline crack, every cold joint, every tie-rod hole. Interior epoxy injections and drylock paint only mask the symptom. The fix is on the outside.

Our Exterior Waterproofing Process

Every exterior waterproofing job we do in Newmarket follows the same five-step sequence. No shortcuts, no spray-and-pray.

1. Locate and protect. We call utility locates, protect landscaping, decks, and AC units, and set up a soil stockpile area that respects the property line and the neighbour’s driveway.
2. Excavate to the footing. We dig along the affected wall down to the bottom of the footing — typically 7 to 8 feet on a full basement. Trench walls are sloped or shored to keep the crew safe.
3. Clean, repair, and membrane. The wall gets pressure-washed, cracks get parged or hydraulic-cement patched, and we apply a full waterproofing membrane — usually a self-adhered rubberized asphalt sheet or a dimpled HDPE drainage board, depending on the wall condition.
4. New weeping tile and stone. We lay new 4-inch perforated weeping tile against the footing, wrap it in filter fabric, and cover it with at least 12 inches of clear stone so water moves down and out instead of sideways into the wall.
5. Backfill and restore. We backfill in lifts, compact where needed, regrade to slope water away from the house, and put your lawn, walkway, or interlock back the way we found it.

Materials and Scope

We waterproof poured concrete, concrete block, and stone foundations in Newmarket. Membrane choice depends on wall type and groundwater conditions — peel-and-stick rubberized sheet for most poured walls, dimpled drainage board for block walls that need a pressure break, and elastomeric coatings only as a backup on tight-access sections. We pair the wall work with a sized weeping tile run that ties into a sump pit or, where lot grade allows, a gravity outlet. If a French drain along the property edge makes more sense than a full wall dig, we will say so — see our companion page on French drain installation in Newmarket.

Permits, Trees, and Conservation

Exterior waterproofing in Newmarket is excavation work, so a couple of municipal items come into play. Newmarket’s Private Tree Protection By-law requires a permit before you remove any private tree with a diameter over 20 cm measured at 1.4 m above ground — if our dig is going to threaten a protected tree, we plan around the root zone or pull the permit before we start. Properties along the East Holland River corridor fall under Lake Simcoe Region Conservation Authority (LSRCA) regulation under Ontario Regulation 41/24, and we handle that approval where it applies. We do not guess — we check.

Why Newmarket Homeowners Call OCM

We are an excavation company first, and exterior waterproofing is an excavation job. That matters in Newmarket because half the cheap basement-waterproofing quotes you will get are interior-only crews who will charge you to drill weep holes and call it a day. We bring the right equipment to the site, dig the wall properly, and put the yard back together so your neighbours cannot tell we were there. Every quote is written, every scope is itemized, and we do not start work without you signing off.

We serve Newmarket and the surrounding York Region and GTA — see our full service areas for the city list.

Frequently Asked Questions

How long does an exterior waterproofing job take in Newmarket?

A single-wall job on a standard Newmarket lot usually runs 3 to 5 working days from dig to backfill. A full-perimeter waterproofing on a Glenway or Stonehaven home can take 7 to 10 working days depending on access, weather, and whether weeping tile and a sump pit are part of the scope. We give you a written timeline before we mobilize.

Is exterior waterproofing better than interior in clay soil?

For Newmarket’s clay soil, yes. Interior systems collect water after it has already passed through your foundation wall — they manage the leak. Exterior waterproofing stops the water from reaching the wall in the first place. In clay, where hydrostatic pressure stays high for weeks, blocking the water at the source is the longer-lasting fix.

Will you damage my landscaping?

Excavation along a foundation wall does disturb whatever sits above it — sod, garden beds, interlock, decks. We document everything before we dig, protect what we can, and restore sod, soil, and grading as part of the job. Specialty hardscape like flagstone or custom interlock we will quote separately so there are no surprises.

Do I need a building permit for foundation waterproofing in Newmarket?

Waterproofing on its own typically does not trigger a Town of Newmarket building permit, but related work — foundation repair, structural underpinning, or a tree removal near the dig — can. We confirm with the Town before we book the job and handle any required permits as part of our quote.

What about my weeping tile — does it have to be replaced?

If we are already digging to the footing, yes — almost always. On 40-year-old Glenway homes the original clay tile or unwrapped perforated pipe is usually crushed, silted, or root-invaded. Replacing it while the trench is open costs a fraction of doing it as its own job later, and a new wall membrane only performs if water can actually drain away from the footing.

Can you work in winter?

We do limited foundation waterproofing in Newmarket during winter — frozen ground slows excavation, membranes have minimum installation temperatures, and backfill compaction is harder when soil is frozen. We will tell you honestly whether your job should wait for spring or whether we can do it safely during a winter thaw window.

Get a Free Quote

If your basement is wet, your sump pit is running constantly, or you can see efflorescence creeping up your basement wall, the fix starts on the outside. Call OCM Excavation & Construction at 416-317-3090 or request a free quote online. We will come to your Newmarket property, look at the wall, and give you a straight answer.

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