Basement & Foundation Waterproofing in Gatineau & Aylmer
We waterproof basements in Gatineau and Aylmer — exterior membranes, interior drainage, sump pumps. Built for local clay soil, not a brochure.
RBQ Licensed #5659-5812-01
25+ years in Gatineau
Owner on every job
ARE YOU EXPERIENCING THIS?
Recurring dampness in the basement despite previous repairs
Persistent musty odour that cleaning cannot eliminate
Peeling paint or efflorescence bubbling on basement walls
Standing water on the basement floor after heavy rain or spring thaw
Basement waterproofing in Gatineau — keeping water out, for good
Basement waterproofing prevents water from entering or pooling in your basement through barrier membranes, perimeter drainage, and pressure management. Exterior waterproofing stops water at the wall surface. Interior systems capture and redirect what gets through.
Gatineau's Champlain Sea clay holds water against your foundation for weeks during spring thaw. That creates sustained pressure that overwhelms aging concrete and degraded membranes. A single-layer defence rarely lasts here.
We've waterproofed basements across Gatineau, Aylmer, Hull, Cantley, and Chelsea for 25+ years. Our RBQ-licensed team looks at your water entry patterns, soil conditions, and foundation type before recommending a system. The right fix depends entirely on how water is reaching your basement.

Exterior waterproofing — the most durable long-term barrier
Exterior waterproofing puts a continuous barrier between soil and your foundation wall. We dig down to the footing, clean and inspect the exposed surface, apply a weather-resistant membrane, and backfill properly.
Excavation with mini excavators handles the tight side yards common in Aylmer and older Gatineau neighbourhoods. Our machines fit through narrow openings without damaging driveways or neighbouring structures.
A modern membrane covers the full wall height and bridges the hairline cracks that develop over time. A drainage board over the membrane creates an air gap that channels water down to the drain at the footing, and clean backfill replaces the original clay.
Exterior waterproofing gives the highest level of protection because water never contacts the concrete.

Interior waterproofing — managing water inside the basement
Interior waterproofing manages water that's already through the foundation wall. A perimeter drainage channel under the basement floor collects water along the wall-floor joint and directs it to a sump pit.
A sump pump with battery backup removes collected water and discharges it away from the foundation. In Gatineau, spring power outages and peak snowmelt hit at the same time. Battery backup is not optional.
Vapour barriers on interior wall surfaces reduce moisture migration through porous concrete — that controls condensation and limits mold. Interior systems also work well when exterior access isn't feasible: row houses, additions tight to property lines, or mature landscaping that makes digging impractical.
When water enters through specific cracks rather than broadly across the wall, targeted crack sealing often solves the issue without a full interior drainage install.

Choosing the right waterproofing system for your home
The right system comes down to four things: where water enters, how much pressure is driving it, your foundation's condition, and whether exterior access is feasible. A single crack leak may only need sealing, not full waterproofing.
Basements with broad dampness along the entire wall length need exterior membrane and drainage correction. Properties in Aylmer built in past decades often have no original membrane. Those foundations relied entirely on the french drain — once it aged past its useful life, water infiltration became inevitable.
Combining exterior waterproofing with french drain replacement in the same project cuts total disruption. Exposing the foundation once for both systems protects your landscaping and avoids a second dig down the road.
When active water infiltration shows up alongside structural symptoms — bowing walls, widening cracks, floor heaving — the leak and the structural issue get addressed together. Waterproofing alone cannot protect a foundation that's still moving.

Our process
Inspect the basement and measure moisture along walls and floor
Identify every water entry point — cracks, joints, broad seepage, or drainage failure
Design an interior, exterior, or combined waterproofing system
Install the membrane, drainage channel, sump pump, or full exterior barrier
Backfill, restore grade, and verify performance under water load
Inspect the basement and measure moisture along walls and floor
Identify every water entry point — cracks, joints, broad seepage, or drainage failure
Design an interior, exterior, or combined waterproofing system
Install the membrane, drainage channel, sump pump, or full exterior barrier
Backfill, restore grade, and verify performance under water load
A $2,000 crack injection today can prevent a $25,000 excavation next year.
Frequently asked questions
What homeowners are saying
Real homeowners. Real projects. Honest results across Gatineau and Aylmer.
Co-designing and executing the landscaping near our house with Pascal was an easygoing exercise with a great result. He offered multiple good options and always listened to our feedback. He was able to explain the strategy behind his recommendations with an aesthetic eye: how the approach would look from the road, how to tie in various structural and colour elements of the house with the landscaping. The interlock included some contrasting colours and patterns, and the front driveway circle is a rarity. Highly recommended.
Kelvin Prosyk
June 2025
Renovatech is one of the best companies that I've ever hired to complete a renovation project. Pascal is transparent and honest when it comes to discussing design choices and pricing and the team work extremely hard to deliver quality work within established timelines. Would recommend to anyone and will continue to call them for my future projects.
Madyson Charbonneau
April 2025
I just had my daughter's birthday party in our new backyard. Everyone was really impressed, which is what inspired this review! Pascal really has a vision for these spaces. The project included cutting out a slope, putting in a beautiful wood retaining wall, new grass, cedars, and a fantastic interlock patio that runs from the deck around to the garage. I now have a decorated sheltered seating area under the overhanging 2nd floor. Everything came out so nice. I strongly recommend Renovatech for any landscaping needs.
C Vass
March 2025
We cannot recommend Pascal and the Renovatech team strongly enough. The quality of work is impeccable, the worksite is always kept clean, they manage projects to be the least disruptive and deliver what they say and when they say it. When we've had any issues with the house, they are extremely responsive — even showing up late on a Sunday evening of a long weekend to help with a surprise leak in our foundation. Cannot recommend the Renovatech team strongly enough.
Dan Benoit
April 2025
Renovatech — Pascal and Team — are my go-to contractors for all things around our home. From landscaping projects, to bathrooms, and basements they do it all. Fair and honest, and 100% transparent — they'll take the time to explain the various materials, pro-cons, and stick within your budget, and always perform high-quality workmanship.
Pej Javaheri
February 2025
Pascal from Rénovatech helped us plan new steps, choose materials, and explained how it could be accomplished using his vast array of equipment. He kept us informed when our initial plan was snagged due to production delays — but the product arrived just in time to meet our strict deadline. His team started excavating Thursday morning and by the end of the next day our entrance stairway was completed. The new steps look great! We would gladly work with Rénovatech again.
Robert Way
September 2025
We had a great experience with Renovatech. They redid our front steps and we are really happy with the work. Pascal was very patient in talking us through our options and helped us pick the right stone to match the house. It was a pleasure to work with them and we wouldn't hesitate to work with them again on another project in the future. Highly recommend!
Valerie Goodhue
March 2025
Excellent work! The team are super professional and their product is next to none. Pascal truly puts his heart into the work his team does! We absolutely recommend them! We love the beautiful deck they made us. The detailed work is incredible!
Jake G
April 2023
We couldn't be happier with Renovatech's work — Pascal and crew were professional and meticulous, starting with a critical repair to our foundation and a new patio in the backyard. We highly recommend this company and their quality workmanship. Hat's off to a job well done!
Charlene Campbell
March 2025
Pascal and his team are amazing. We needed a deck built around this cabin renovation project and they delivered!! Very precise, professional, and punctual — we would highly recommend their services!
Steve Bedard
April 2025
Reliable and hard working. They understand what quality work is all about.
Martin Pham Dinh
March 2026
An honest contractor who takes pride in his work — harder and harder to find these days. Pascal and his team are rare gems. They built the deck we had always dreamed of.
Nicolas Pham-Dinh
Mars 2026
Excellent service at Renovatech Gatineau! The team was courteous and professional. We really appreciated the suggestions and advice that helped us make the right choices for our project, especially for our hardwood floors. The staff is knowledgeable, attentive, and takes the time to explain the different options. Highly recommend!
Gabrielle Aubert
Mars 2026
I want to thank Pascal and his team at Renovatech. Last year for the construction of my patio and this year for the grading work. You did a remarkable job!! A professional and dedicated team that always gives their best. Very satisfied client. Highly recommend!!
Mathieu Rioux
Avril 2025
Pascal and his team always do exceptional work, they listen to their clients' needs and can solve any problem. Attention to detail is very important to Pascal and that is what makes his projects a success. It is a pleasure to work with them.
Gabrielle Aubert-Dubois
Mars 2025
Very positive experience with this company. A skilled, professional, and efficient team. The work is done with care and the quality is excellent. You can tell they know their trade perfectly and know exactly what to do to get an impeccable result. Highly recommend!
Stephany Labelle
Mars 2026
Great work from Pascal's team. He redid my driveway, my steps, and graded my yard. He was very helpful and reliable, and proposed good solutions to achieve the desired result.
Étienne Gosselin
Avril 2024
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Call us or send a quote request. We'll walk your property and tell you what we see.
819.213.0597