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 Montreal 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 a call. Our team of highly skilled concrete slab contractors has been specializing in basement floors and offer a solid warranty backed by over 30 years in the business.
Servicing all of Montreal, West Island, Laval and the South Shore for over 3 decades Akton 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 most cost effective method to achieve a successful, long lasting basement floor repair.
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 approx 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 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)
There are many reasons for a concrete basement slab to require 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 we have another serious issue caused by Pyrite that older homes Montreal, Laval and the South Shore may have in the backfill under their basement slab..
Pyrite or "Fool's Gold" is a type of mineral that can sometimes be found in the gravel used under basement floor concrete slabs that were created in and around the GTM (Greater Montreal Area). The problem occurred when trace amounts of pyrite in the granular fill used as a base for the concrete slabs was used. 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.
The only way to repair cracks caused by pyrite under the basement slab is to 1st remove the concrete slab, then remove the existing gravel. Once the removal of the old concrete floor and gravel is completed, add new gravel and pour a new concrete garage floor. If someone replaces the slab without replacing the gravel it is possible the slab could crack again.
Call one of our representatives today for a FREE foundation repair quotation!
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