Question 1

Is cracked asphalt connected to leaking expansion joints below?

Accepted Answer

Often, yes. Expansion joints do not leak without something above breaking the membrane first, and where a joint runs near paved areas, cracked asphalt is a common cause. Sealing the joint without sealing the asphalt treats the symptom while the source keeps working.

Question 2

Do you need to find where the water is entering before injecting?

Accepted Answer

No, and that is the main advantage of the method. The resin takes the path of least resistance, which is the same route the water used, so it travels back toward the entry point on its own. On garage decks this matters because water can travel 20 feet or more under a debonded membrane before it exits at the joint.

Question 3

Is a block-wall elevator pit worse than a poured concrete one?

Accepted Answer

A block-wall elevator pit is harder to keep dry than a poured concrete one, because block assemblies have hollow cores and mortar joints that give water more paths through the wall. Poured concrete has a cold joint at the floor and occasional cracks; block has a grid of potential paths. It changes the strategy more than it changes the cost.

Question 4

Why can't you just seal a block-wall elevator pit completely?

Accepted Answer

Sealing a block-wall elevator pit completely, where the hydrostatic pressure outside is severe, means that pressure accumulates against the wall indefinitely with nowhere to go. Concrete block is weaker than poured concrete to begin with. The outcome is either rapid degradation of the wall or, at the extreme, the pit walls caving in — so the pressure has to be relieved rather than resisted.

Question 5

What are the warning signs of water damage on a garage beam?

Accepted Answer

Look for dark staining that persists in dry weather, white efflorescence streaking down the face, rust staining, and spalling where concrete flakes or breaks away. Staining alone is a maintenance item. Rust staining or spalling on a structural beam warrants an engineer's opinion.

Question 6

Why do expansion joints between parking levels leak?

Accepted Answer

Mostly from vehicles. Cars track a large amount of snowmelt, rain, and road salt into a Toronto parking garage, and that moisture runs across the slab and settles into the joint. It then works through to the level below, appearing as a leak on the ceiling of the level underneath.

Question 7

Can you just seal a crack in an elevator pit wall?

Accepted Answer

You can inject and seal a crack in an elevator pit wall only once you have confirmed the concrete around it is solid. Sealing over a hollow, delaminated area traps water behind it, and in our experience that leads to a larger area needing patching later — every time. The sounding test comes before the decision, not after.

Question 8

How do you find a leak in an elevator pit that isn't obvious?

Accepted Answer

Where the water path is not visible we use thermal imaging, which shows the saturated sections of an elevator pit clearly against the dry concrete. Read alongside the handful of ways water normally enters a pit, an infrared scan narrows it quickly. The harder judgement is predicting what fails next once the current path is sealed.

Question 9

What does rust-coloured staining on a concrete wall mean?

Accepted Answer

Yellow-brown staining around a crack means water has reached the rebar inside the wall and the steel is corroding. The staining is rust washing out through the crack. It usually indicates a narrower crack than a white-stained one, because it takes less water to corrode steel than to carry calcium out, but it points to a more structural problem.

Question 10

What does white powder around a concrete crack mean?

Accepted Answer

White deposits around a concrete crack are calcium carried out of the concrete by water moving through it, and the amount tells you the volume of flow. A heavy white bloom means a sustained, significant water supply behind that crack — not an occasional seep. It is the strongest visual signal that a crack is an active water path rather than a cosmetic one.

Question 11

Can the TSSA shut down an elevator because of water in the pit?

Accepted Answer

The TSSA can condemn elevator equipment over water in the pit, and it does not need to catch the pit flooded to do it. Staining on the pit walls showing water has previously reached half a foot to a foot is enough evidence of a history. The equipment usually stays out of service until the pit is waterproofed, and sometimes until the equipment itself is serviced or replaced.

Question 12

How long should elevator pit waterproofing last?

Accepted Answer

Properly installed elevator pit waterproofing generally holds around the ten-year mark, and we have had installations run well past five years even on pits where the walls were in poor condition to begin with. The variable is the substrate, not the coating — a pit with sound concrete lasts longer than one where the walls were already frail when we arrived.

Question 13

Does the elevator piston housing itself leak?

Accepted Answer

The piston housing does not leak. It is a fully sealed steel cylinder holding the piston and its oil, and it does not degrade or fail in the way people assume. The water problem is around it, not through it — the void in the ground surrounding the housing fills with groundwater, and that water then rises into the elevator pit.

Question 14

Can our building's superintendent just pump the elevator pit out?

Accepted Answer

Pumping an elevator pit out is reasonable as a first step and it is what most property managers do, but it treats the symptom. Pumping also does not tell you where the water came from — and if the pit is full of sediment and debris, nobody can see the entry point at all. The useful version is pumping, cleaning, and then inspecting the empty pit.

Question 15

Can the elevator pit walls collapse if we leave the water?

Accepted Answer

The elevator shaft will not collapse if the pit walls fail. The shaft is built as a stack of independent rings that do not bear on each other, so even a completely destroyed pit floor leaves the shaft above standing. What you lose is the elevator: it cannot run without a sound pit, so you are looking at a rebuild before the car moves again.

Question 16

Does the season change how much water gets into an elevator pit?

Accepted Answer

Season makes almost no difference to an elevator pit, because the pit sits deep enough underground to stay at a stable temperature year-round. What changes the water volume is groundwater — heavy rain and sudden snowmelt push more water against the shaft. That is why a pit can be dry for months and then flood twice in one week.

Question 17

How much water in an elevator pit is too much?

Accepted Answer

Any standing water in an elevator pit is worth acting on, and staining that shows water has reached half a foot to a foot up the walls is the level that draws regulatory attention. The pit floor is designed to be dry. Elevator equipment sits low in the shaft, so water depth translates directly into corrosion on parts that are expensive to replace.

Question 18

Is water in an elevator pit an emergency?

Accepted Answer

Water in an elevator pit is not usually an emergency on the day you find it, but it stops being optional quickly. The TSSA can condemn elevator equipment over a pit that shows a history of flooding, and it reads that history off the staining on the walls — so a pit that is merely damp today can still fail an inspection. Water also rusts elevator equipment, which is the expensive part.

Question 19

Why is there oil in the water in our elevator pit?

Accepted Answer

Oil in an elevator pit comes from the elevator equipment itself, most often hydraulic oil, and it accumulates on the pit floor over years. It matters for two reasons: oil is heavier than water, so it settles and clogs the bottom half of the pit drain, and it soaks deep into the concrete pores and has to be ground out before any coating will bond.

Question 20

How do I know if the leak in my parking garage is coming from the expansion joint?

Accepted Answer

Water running out along the line of a joint in the ceiling of P1, especially onto parked cars, points to the expansion joint. But the joint is where the water exits, not where it entered — the actual breach in the membrane can be 20 feet away or more. An inspection identifies the entry point before anyone budgets a repair.

Question 21

Why does the leak appear in a different place than where the water gets in?

Accepted Answer

Water that gets under a debonded deck membrane runs along the concrete slab until it reaches the expansion joint, then exits there. On one downtown Toronto garage we measured roughly 20 feet between the crack in the membrane and the visible drip inside. This is why digging directly above the drip often misses the failure.

Question 22

What is a cold joint in concrete?

Accepted Answer

A cold joint is the seam formed where fresh concrete was poured against concrete that had already started to set, leaving the two pours imperfectly bonded. It is created during construction rather than by damage or age, and it runs through the full thickness of the element. Because the bond across it is weaker than the surrounding concrete, it is a common water path.

Question 23

Can a cold joint be sealed from the inside?

Accepted Answer

A cold joint can be repaired from the accessible side, which is how nearly all of this work is done in an occupied building, with no excavation and no access to the outside face required. The repair cuts into the seam, injects adhesive deep into it, then rebuilds and waterproofs the opening. Sealing only the surface does not work, because the seam continues behind it.

Question 24

How do I tell a cold joint leak from a crack leak?

Accepted Answer

A cold joint leak follows a straight horizontal line at a consistent height, usually where a wall meets a floor slab, while a crack leak wanders and often runs diagonally or vertically. Staining, efflorescence or damp along a straight seam at the base of a garage wall is the signature of a cold joint rather than a crack.

Question 25

Is a leaking cold joint an emergency?

Accepted Answer

A leaking cold joint in a parking garage is not usually an emergency, but it is a continuous path for chloride-laden water to reach reinforcing steel, so it gets worse rather than staying stable. In an elevator pit the same seam is urgent, because water reaching elevator equipment can put the elevator out of service.

Question 26

Are cold joints a construction defect?

Accepted Answer

Cold joints are a normal consequence of pouring concrete in stages and are not in themselves a defect, since every multi-storey building has them. What varies is how well the joint was prepared and treated at the time. A cold joint that leaks fifteen years on is usually showing the limits of the original detail rather than anything that went wrong later.

Question 27

Can a crack with water coming through it be repaired?

Accepted Answer

A crack with water actively running through it can be repaired, but not by patching the surface — the water pushes the repair off before it bonds. The crack is injected with a material that cures in wet conditions, sealing it from the inside. Most cracks worth repairing in a parking garage have water in them.

Question 28

How can you tell if garage water is coming from the slab above or tracking in from outside?

Accepted Answer

Look at where the staining stops. If the water marks are confined to one element — a conduit box, a pipe chase, a single joint line — and the rest of the P1 ceiling is clean and dry, the water is being carried in from outside rather than coming down through the deck. A slab-above failure almost always leaves staining in more than one place.

Question 29

Why is water leaking into our pool mechanical room?

Accepted Answer

The usual cause is the expansion joint around the pool deck rather than the pool shell itself. The joint runs the full perimeter where the deck slab meets the pool structure, and when the sealant fails, deck water passes straight through into the space below. On a suspended condominium pool that space holds the pool plant, so the water lands on pumps, filters and controls.

Question 30

Why does water pond on a floor that used to drain properly?

Accepted Answer

Usually the floor did not change, the room did. Partition walls get added, a line moves, one room becomes two, and drains that were correctly placed for the original layout end up somewhere the water never reaches. The slab still falls exactly the way it was poured. It just no longer falls towards a drain.

Question 31

What does staining on the ledge beam under a garage ramp mean?

Accepted Answer

Staining, calcite deposits and active dripping on the ledge beam under a garage ramp usually mean the trench drain above it is leaking. Water gets into the trench drain body through cracks or porous old concrete, or escapes around the outside of the drain pipe where it drops through the slab, then tracks into the beam. Left alone it progresses to cracking and delamination of the beam concrete.

Question 32

Does the garage ramp have to close to repair the trench drain?

Accepted Answer

No — a trench drain repair at the bottom of a garage ramp is done half at a time so the ramp never fully closes. We take one side under traffic control, work the roughly ten feet of trench on that side, then open it and move to the other. Each half runs one to two days depending on debris and cracking, and weather rather than traffic sets the schedule.

Question 33

How do you seal around a drain pipe that leaks on the outside?

Accepted Answer

Water escaping around the outside of the drain pipe is sealed by bonding fibreglass reinforcement across the junction and coating it with membrane so the trench floor and the pipe become one continuous surface. The area is ground and cleaned, a bonding agent goes down, the fibreglass runs about three inches onto the trench floor and a couple of inches down inside the pipe, then the membrane coats over it.

Question 34

How do you know a trench drain repair actually worked?

Accepted Answer

A trench drain repair is verified with a flood test — the drain is run full and checked for flow and for any water reaching the ledge beam below. Ask to see the underside after the test, not just the trench. On our jobs the ledge beam below is also cleaned up and repaired, so the topside and the underside both show finished work rather than fresh membrane over old staining.

Water damage & leaks