Below-Grade Concrete in Laval, Sealed Against Water
A basement that stays dry starts with waterproofing and proper drainage, not with the finished floor. Laval Concrete handles the slab work, crack sealing, and moisture barriers that let you build a usable space below grade, whether you need a new floor, a renovation base, or a walkout exit. Free written estimate on every project.
A basement slab sits where groundwater pressure is constant. Without proper foundation waterproofing and crack sealing, moisture will migrate through the concrete, under flooring, and into the space above. That is why we address the walls and drainage system first.
Once the envelope is sealed, the basement floor can be poured or resurfaced to the right flatness and detail. A vapour barrier sits between the sub-base and the slab, and the concrete is finished to a level that accepts finished flooring without shimming or additional prep.
The result is a dry, stable foundation for basement renovation work. Whether you are framing a bedroom, installing a workshop, or adding a walkout basement exit, the concrete underneath has to be sound and moisture-free. That starts with the foundation itself.
Recent work
The sequence
How Basement Concrete Gets Done in Laval
Assess moisture and cracks
We inspect the foundation walls, floor, and perimeter drainage to identify where water enters and what needs sealing or repair before any new concrete goes in.
Seal and waterproof
Active cracks are injected, walls are sealed with membrane or coating, and drainage is restored so groundwater is managed away from the slab.
Prepare and pour
The sub-base is compacted, a vapour barrier is laid, and the concrete is poured to the correct elevation and finish for your planned use.
Cure and transition
The slab cures to full strength, we walk the space with you, and you receive care instructions and a timeline for finished flooring or framing.
Expanding the space
Renovation Slabs and Walkout Basement Concrete
A dry basement opens possibilities. Basement renovation concrete includes the slab levelling, repair, and detail work that finished basements require. The floor must be flat enough for flooring, properly sloped for drainage, and set with the right vapour barrier so moisture does not migrate up through the finished surface.
A walkout basement is a larger undertaking. It involves cutting a new exit through the foundation, installing new footings and steps, and tying in drainage and slab detail so the exit is safe and the space gains daylight. Both projects depend on a dry, sound basement floor as the base, which is why waterproofing and crack repair happen first.
Waterproofing, floors, cracks and walkout work for basement concrete in Laval.
Yes. Waterproofing and drainage come before any finished surface, because water under or behind a slab will find every shortcut. We deal with where water gets in first, then pour the floor.
Usually. A basement floor can often be resurfaced or re-poured flat over a prepared sub-base, with crack repair first where cracks are active. We confirm the cause before recommending a fix.
A walkout basement means cutting a grade-level exit into the foundation, with new footings, steps, drainage and slab detail to match, so a below-grade level gains daylight and direct yard access.
Spring melt raises the water table and pushes against the foundation. Seasonal leaks usually mean cracks plus a drainage problem, both addressed together with crack repair and waterproofing so the fix holds.
Yes. Basement renovation concrete covers the slab repair, levelling, vapour barrier and detail work that has to be right before framing and finished flooring go in.
Leaking walls, uneven floors, renovation prep, or a walkout exit. Tell us what is happening below grade and we will schedule a free assessment with a written, itemised quote.
