Basement slabs take a lot of abuse. They have to support heavy furniture, lots of foot traffic, and resist exterior freeze and thaw cycles from our arduous Montréal winters. But a concrete slab that has been properly installed and cured should provide years of crack-free issues even under the most intensive conditions. If your basement slab is cracked or broken by frost heave, settling, pyrite damage or incorrect installation, give Akton Injection a call. Our trained concrete slab contractors specialize in basement floors and offer a solid warranty backed by over 40 years of experience in the business.


Serving all of Montréal, West Island, Laval, and South Shore for over 4 decades, Akton Injection has specialized in the repair and reconstruction of concrete slabs for over a quarter of a century. We know that the first priority is to properly repair your basement floor. Just give us a call and our team of concrete slab repair contractors will work with you to find the best and the most cost-effective method to achieve a successful, long-lasting basement floor repair.

Basement Floor Replacement and Pouring a New Basement Cement Floor

Consider a 1000 square feet basement floor area and check out the steps that are followed to replace it with a new cement floor:

Step 1: Clear basement floor of all materials

Step 2: Break the floor into small pieces

Step 3: Excavate out (remove) cement floor and existing fill down approximately 12 inches.

Step 4: Backfill 7 inches of ¾ gravel DB certified

Step 5: Install wall drain and protection board (DELTA MS) around the perimeter

Step 6: Lay down the French drain (weeping tile) wrapped with a geo-textile around the perimeter

Step 7: Compact gravel

Step 8: Lay 6 mil vapour barrier to cut the humidity

Step 9: Lay 3/16 steel mesh to reinforce the concrete

Step 10: Pour 5 inches of 32 MPA concrete

Step 11: Finish floor (Standard finish)

Optional: machine finish (extra 1.10 per square foot)

What Causes Your Basement Floor to Crack?

Because of many reasons a concrete basement slab may need repairs. Settlement cracks in a slab, frost heave, or expansive soil damage and shrinkage cracks in a slab are just a couple of the most common reasons. In Quebec, another issue may be because of pyrite being present in the backfill under the basement slab of older homes in Montréal, West Island, Laval, and South Shore.

Pyrite Damage to Your Basement Floor Slab

Pyrite or "Fool's Gold" is a type of mineral that may be found in the gravel used under basement floor concrete slabs that were created in and around the GTM (Greater Montréal Area). The problem occurs when a considerable amount of pyrite in the granular fill was used as a base for the concrete slabs. When exposed to water, oxygen, and a certain bacteria, the iron sulfide in the granular mix produces ferric iron that continues to be produced until one of the elements is exhausted. The concrete slab of your basement floor traps the elements in the pyritic backfill and eventually the excess ferric iron heaves upward until the slab lifts and cracks.

Pyrite Extraction and Basement Concrete Slab Repair

The only way to repair cracks caused by pyrite under the basement slab is to first remove the concrete slab and then remove the existing gravel. After removing the old concrete floor and gravel, add new gravel and pour a new concrete garage floor. If the slab is replaced without replacing the gravel, there is a possibility that the slab may crack again.

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