Basement Waterproofing in Don Mills

Injecting one crack in a 1950s poured wall starts around $400. When the diagnosis calls for drainage inside the footing, expect $100 to $250 for each foot of wall treated, and excavating outside to apply a membrane runs $250 to $450 for each foot. We price only the lengths of wall the diagnosis points to, which on most houses here is a small part of the perimeter.

Frequently, and it changes what the correct repair is. When water is coming down the slope from the lots above, it is moving across the ground rather than sitting under pressure, so the first fix is usually outside: regrading, a shallow swale to steer it around the house, and downspouts that empty well away from the path it takes. We look at where the house sits before we look at the wall.

Usually, yes. A crack that leaks but is not structural gets injected from the basement side with polyurethane or epoxy resin that fills the route the water is using, normally a few hours of work. Where the crack is being worked open by ground movement or ongoing pressure, injection alone will be followed by a new crack, so we pair it with drainage improvements outside.

Yes. The mid-rise apartment and institutional stock around Don Mills and Flemingdon Park carries below grade parking, much of it on original or first replacement membrane. Traffic bearing systems, expansion joints, and crack injection, with reports formatted for reserve fund studies.

Excavating the outside of a Don Mills foundation is the longest option: three to five days on an ordinary lot, and more on a ravine property where a machine has a harder time getting down beside the house. Inside work is quicker, with an interior perimeter system taking one to two days and a crack injection a few hours.

It is, in writing, with terms that belong to the particular system we put in. You receive them before any work begins, and we explain how the cover differs for an injected crack, an interior drainage system, and an exterior membrane, so the limits are clear well before you would ever lean on them.

Worth checking, because where a Don Mills roof is flat it often drains through one or two scuppers or downspouts rather than eavestrough on every side, which puts the runoff from the whole roof at a single corner of the foundation. If that outlet empties beside the wall or into a blocked line, the leak in that corner of the basement is really a roof drainage problem, and rerouting the discharge costs very little.