What does foundation caulking and sealing typically cost for a townhouse in Vaughan?

Foundation caulking and sealing for a typical Vaughan townhouse runs $400 to $1,500, depending on the scope of work, the number of joints and penetrations, and whether you're also applying a penetrating sealer to the foundation walls. End-unit townhouses cost more than interior units because they have more exposed foundation wall area.

For a standard Vaughan townhouse, the caulking portion of the job covers the joint where the foundation meets the siding or brick veneer, all utility penetrations (gas line, electrical conduit, water main, cable, dryer vent, exhaust fan vents), window wells, and any cracks or gaps in the exposed foundation. A professional caulking job uses polyurethane caulk ($5 to $15 per linear foot installed) for most joints because it adheres well to masonry, remains flexible through Toronto's temperature swings, and is paintable. Silicone caulk is used for expansion joints and areas requiring maximum flexibility but cannot be painted. For a typical interior townhouse unit with 20 to 30 feet of exposed foundation and 8 to 12 penetrations, expect $300 to $800 for professional caulking. End units with 40 to 60 feet of exposed foundation run $500 to $1,200.

The sealing portion involves applying a penetrating concrete sealer (silane or siloxane-based) to the exposed parging or foundation surface. This sealer soaks into the concrete and creates a hydrophobic barrier that repels water and road salt without changing the appearance of the foundation. At $3 to $7 per square foot applied, sealing the exposed foundation of a Vaughan townhouse adds $200 to $600 to the project depending on the area covered. This is particularly worthwhile in Vaughan because many townhouse developments from the 1990s and 2000s have concrete driveways and walkways immediately adjacent to the foundation, and winter road salt and de-icing chemicals splash onto the foundation walls constantly. Salt accelerates efflorescence and chemically attacks Portland cement-based parging, so a penetrating sealer provides genuine protection.

Vaughan's clay soil conditions add another dimension to foundation sealing. Much of Vaughan sits on heavy clay that expands when saturated and shrinks during dry periods, creating lateral pressure against foundation walls and holding moisture against the concrete for extended periods. While caulking and sealing the above-grade portion of the foundation is important, homeowners should also ensure proper grading (soil sloping away from the foundation at a minimum of 6 inches over the first 6 feet) and functioning downspout extensions directing water at least 6 feet from the foundation. These drainage measures work together with caulking and sealing to keep water away from the foundation.

This is a project where capable homeowners can handle the caulking portion themselves for $50 to $150 in materials — a good quality polyurethane caulk, a caulking gun, backer rod for wider gaps, and a utility knife. Clean each joint thoroughly, apply backer rod in gaps wider than 10mm, apply the caulk in a continuous bead, and tool it smooth with a wet finger or caulking tool. The penetrating sealer application is also straightforward — clean the surface, let it dry completely, and apply with a brush or roller per the manufacturer's instructions. Where you need a professional is if the foundation has cracks wider than 3mm, areas of delaminated or crumbling parging, or signs of water infiltration in the basement — those issues go beyond caulking and sealing into repair territory.

All professional contractors working in Vaughan must carry WSIB coverage. Need help finding a caulking or sealing contractor? Toronto Parging can match you for free through the Toronto Construction Network.