Foundation problems
Water Getting Into the Basement
Where is the water in my basement coming from?
The entry point tells you the cause, so find it before buying anything. Water on the wall above floor level is coming through the wall. Water at the joint where the floor meets the wall is coming from below under pressure. Water in a window well is a drainage failure at that well. Water with no weather trigger at all may be plumbing rather than groundwater. Each points at a different fix, and the cheapest ones are outside.
We are a referral service, not a contractor. Your request goes to an independent Calgary foundation company.
This one splits both ways. The specifics below decide it.
What you are probably seeing
- A damp patch or wet trail on the wall, often traceable upward to a crack
- Water appearing along the seam where the floor slab meets the wall
- A window well holding water after rain or melt
- Damp or lifting flooring against an exterior wall in a finished basement
- White chalky efflorescence marking where water has evaporated repeatedly
- A musty smell with no visible water
What causes it
- Surface water reaching the foundation
- Grading sloping toward the house, downspouts discharging at the wall, a settled patio, or a driveway shedding toward the foundation. The most common cause and by far the cheapest to correct.
- Hydrostatic pressure from below
- Saturated soil puts groundwater under pressure, which pushes up through the floor-wall joint, the slab, or the floor drain. Water arriving at the cove joint is the signature.
- Failed or missing weeping tile
- The drainage pipe at the footing has silted up, collapsed, or was never installed, so groundwater stays against the wall rather than being carried away.
- A specific defect
- A crack, a poorly sealed service penetration or a deteriorated patch of wall lets water through at one identifiable point, which is repaired directly rather than with a system.
- Condensation, not a leak at all
- Warm humid air meeting a cold wall or cold pipe produces water that looks exactly like seepage. Worth ruling out before spending anything, and characterised by dampness spread evenly rather than concentrated at a point.
- Plumbing
- A failed water heater, a burst supply line or an appliance hose presents very similarly, and calls for a plumber rather than a foundation contractor.
How serious is yours?
The left column is worth acting on. The right column is genuinely fine to watch, and saying so is the point of this page.
Get this assessed
- Get this looked at: Standing water accumulating now
- Get this looked at: Water near electrical panels, outlets or a furnace
- Get this looked at: Sewage or drain backup, which is a health matter and a different trade
- Get this looked at: Water arriving alongside new or widening cracks
- Get this looked at: Water entering at multiple points along the wall
Reasonable to monitor
- A brief damp patch during spring melt that dries out
- Slight seasonal humidity in an unfinished basement
- Efflorescence with no currently active water
- A musty smell that turns out to be a condensation and ventilation issue
How it is usually dealt with
Grading and downspouts
Re-establishing slope away from the house and discharging roof water well clear of the foundation. Often the entire fix for event-driven water, and a fraction of the cost of any system.
Window well drainage
Clearing or installing drainage in a well that fills, and fitting a cover. Cheap, and directly targeted where the water is entering there.
Crack injection
Where water enters through one identifiable crack, sealing that crack through the wall thickness.
Interior drainage and sump
Where water arrives along the floor-wall joint under pressure, a perimeter channel collects it and a pump discharges it outside.
Exterior excavation and drainage
Where the weeping tile has failed or the wall itself needs protecting, addressing the water before it reaches the structure.
The Calgary angle
Calgary basement water clusters in two windows and both are about volume rather than about the foundation failing. Spring melt releases a winter of precipitation over a few warm days onto ground still frozen underneath, so it runs across the surface to the lowest point it can reach. Summer downpours briefly exceed what the drainage around a house can carry. A basement that is dry for ten months and wet for one is describing a drainage capacity problem, and no interior system addresses the cause of that.
What to do next
These cost nothing and make any later assessment considerably more useful.
- Find and photograph the exact entry point while it is wet
- Note whether it is on the wall, at the floor joint, or at a window well, since this alone narrows the cause
- Record what triggers it: melt, heavy rain, continuous, or nothing weather-related
- Walk the perimeter outside and check grading, downspouts and window wells at that location
- Rule out plumbing if there is no weather correlation
The repair page for this problem
If you have decided it needs attention, this is the page covering what the work involves and what it costs.
Basement leak repairQuestions people actually ask
Why does my basement only leak in spring?
Because Calgary snowmelt concentrates a winter of precipitation into a few warm days, and it often lands on ground still frozen below the surface that cannot absorb it. Water then travels across the top to the lowest point, which is frequently a foundation wall. Seasonal water that tracks the melt is a drainage and grading signal, and the fix is usually outside rather than in.
Is water at the floor-wall joint different from water on the wall?
Yes, and it is one of the most useful distinctions you can make. Water on the wall face has come through the wall. Water at the joint where the slab meets the wall has come up from below under hydrostatic pressure. The first may be a crack repair; the second usually calls for drainage rather than sealing, because sealing a joint under pressure tends to move the water rather than stop it.
What is the cheapest way to fix a wet basement?
Correcting grading and downspouts, which is frequently a few hundred dollars and frequently the whole answer. Ground should fall away from the house and roof water should discharge well clear of it. Any assessment that goes straight to a system without examining these deserves a second opinion.
How do I know if it is condensation rather than a leak?
Condensation is spread fairly evenly over cold surfaces rather than concentrated at one point, it is worse in humid weather rather than after rain, and it often appears on pipes and windows as well as walls. Taping a square of plastic sheet tightly to the wall for a day distinguishes them: moisture on the room side is condensation, moisture behind it is water coming through the wall.
Not sure what you are looking at?
Send a description and a postal code. It goes to an independent Calgary foundation contractor who can tell you what it is.
We are a referral service, not a contractor. Your request goes to an independent Calgary foundation company.