Foundation waterproofing is the definitive physical barrier against groundwater and hydrostatic pressure. A certified waterproofing membrane protects your basement for decades — no leaks, no mould, no premature concrete deterioration.
⚠️ Water or moisture in your basement? Priority service available → (514) 730-7107
25 years
warranty
300+
foundations treated
2–4j
job duration
Delta MS
approved membrane
Understanding
What is foundation waterproofing?
Foundation waterproofing means applying a waterproofing membrane to the exterior face of your foundation wall. This membrane creates a continuous physical barrier that stops groundwater, capillary moisture and soil gases from passing through the concrete and into your basement.
Unlike interior solutions that hide the problem, exterior waterproofing treats the cause at the source — where water meets your foundation. It's the lasting solution structural engineers recommend for protecting foundations in Quebec.
→Delta MS membrane or certified equivalent — a continuous physical barrier
→Applied from the footing to ground level without interruption
→Lasting protection against moisture, roots and hydrostatic pressure
→Compatible with a French drain for maximum protection
80%
of recurring leaks are linked
to a missing or deteriorated waterproofing membrane. Treating the exterior cause is the only way to eliminate the problem at the source.
A definitive, lasting solutionTransferable 25-year warranty — approved Delta MS membrane
Warning signs
Your foundation is sending you signals
These symptoms indicate that a waterproofing membrane is missing, deteriorated or inadequate.
Recurring leaks after rain
Water marks that keep coming back despite spot repairs show that the source of the problem — the foundation's exterior permeability — hasn't been treated.
Foundation walls that are always damp
Chronic moisture on the inside basement walls means water is actively passing through the concrete — a sign of a missing or deteriorated membrane.
White efflorescence on the concrete
These white mineral deposits show that water is passing through the concrete and carrying mineral salts to the surface. It's the classic signature of an active leak.
Peeling or blistering paint
Paint or wall coverings coming loose in the basement are caused by moisture pressure from the concrete — a reliable sign of permeability.
Foundation over 25 years old, never treated
Foundations built before the 2000s often have no waterproofing membrane at all. A preventive inspection is a must before problems appear.
Finishing the basement
Before investing in finishing your basement, make sure your foundation is waterproofed. A moisture problem discovered after the work is done can be very expensive.
Our method
Complete waterproofing in 5 steps
From inspection to restoration, here's how we protect your foundation.
01Step 01
Inspection & diagnosis
Complete assessment of the foundation, identifying at-risk areas and existing leak points.
02Step 02
Targeted excavation
The foundation is exposed to its full depth around the targeted perimeter. Trees and landscaping are carefully protected.
03Step 03
Preparing the concrete
High-pressure cleaning, sealing of existing cracks and a bonding primer applied so the membrane holds as well as possible.
04Step 04
Applying the membrane
The certified Delta MS membrane is installed from the footing to ground level, with continuous coverage and no seams or gaps.
05Step 05
Backfill & finishing
Drainage stone placed against the membrane, careful backfill in compacted layers, then grass seeded or sodded depending on the season.
What is foundation waterproofing and how does it work?
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Waterproofing means applying a waterproofing membrane to the exterior face of your foundation. The membrane forms a continuous barrier that stops water and soil gases from getting into the concrete. It works at the source of the problem, where water meets the foundation, before it can seep in.
What's the difference between waterproofing and a French drain?
+
A French drain collects and carries away water that builds up at the base of the foundation. Waterproofing stops water from passing through the concrete with a physical barrier. The two systems work together: the drain handles the volume of water, and the membrane stops it before it reaches the concrete.
How much does foundation waterproofing cost in Montreal?
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The cost depends on the perimeter to treat, the depth of the foundation and how accessible the property is. Contact us for a free on-site quote, with no obligation.
How long does waterproofing take?
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Usually 2 to 4 days for a standard single-family home, depending on the targeted perimeter. The yard is left clean and restored at the end of the job.
Is the waterproofing membrane under warranty?
+
Yes. Our work is covered by a 25-year warranty on labour and materials, transferable to the new owner with written notice.
Can you waterproof from the inside only?
+
Interior solutions exist (floor drain, waterproof paint), but they treat the symptom, not the cause. Exterior waterproofing is the only method that stops water before it reaches your concrete — it's the solution structural engineers recommend.
Should waterproofing be combined with a French drain?
+
In many cases, yes. If your property has a high water table or poorly draining soil, the French drain removes hydraulic pressure while the membrane protects the concrete. Our technicians recommend the best combination for your situation.
Real results
Foundations protected, homeowners reassured
Waterproofing
★★★★★
"My basement had leaks for 3 springs in a row. After the waterproofing, nothing. The team protected my mature trees and the yard was spotless that same evening."
MD
Martin D.
Saint-Laurent, Montréal
Waterproofing
★★★★★
"Before finishing my basement, I wanted to make sure it was dry. Fissure et Drain XT waterproofed the foundation first. My contractor was impressed by the quality of the work."
IB
Isabelle B.
Terrebonne
Waterproofing
★★★★★
"I had doubts at first. After the work, I understand why it was necessary. No moisture for 2 winters. The 25-year warranty convinced me to go ahead."
MF
Michel F.
Laval, Pont-Viau
Protect your foundation for good
Get a free, no-obligation quote for waterproofing your foundation.
*
The warranty covers only workmanship defects and construction flaws related to the work performed by Fissure et Drain XT. It does not cover damage caused by ground movement, soil defects, earthquakes, exceptional flooding, work done by third parties or any unauthorized modification after the work is completed. Warranty transferable to the new owner upon written notice. RBQ 5863-7364-01.
RBQ 5863-7364-01
25-year warranty* transferable
