- Core Fill is Not Waterproofing
Core fill is designed to add strength to a cement block wall. Core fill is poured into block voids to fill hollow holes in blocks to add needed strength to a foundation / block wall. Filling in the voids in block wall might help to reduce water but is not designed to be waterproofing. Cement is porous by nature and without added waterproofing, it can never be guaranteed that water will not penetrate.
Core Fill & Waterproofing
- Should Waterproofing be done with Core Filling?
Each property is different, and every situation calls for its own diagnosis. Using core fill without waterproofing is a rare solution, especially in our climate. Winters in Canada are cold, and cold can cause plenty of damage to a foundation if it has variables working against it. If the fill (dirt) around the building is not permeable, then water will build up and pool against the foundation. When freezing temperatures hit the water-soaked soil around your house, frozen soil creates pressure against the foundation. This pressure, depending on the extent of the issue, will damage the foundation wall by causing cracks, heaving, and bowing of walls and will allow water to penetrate the building, causing a whole slew of additional problems.
Think of it this way…. If your roof were rotten and the plywood needed to be replaced, would you put plywood on without water shield / rubber membrane or shingles? Of course not, because the plywood would not last long, it is not waterproofed and needs to be protected from the elements, and the repair will not last long before it needs to be repaired again. Just because you cannot see what is going on underground it does not mean erosion is not happening.
- Are there times when core fill can be done without waterproofing or drainage repairs?
Sure, but this is not common. Failure of a block wall is often the result of poor drainage.
- Does the fill get removed and replaced when waterproofing?
When diagnosing problems that caused a bowing wall (for example); removing fill and replacing it is often part of the remedy. Poor drainage material is replaced with a mix of proper fill to provide good drainage. This is done along with an accurately installed waterproofing and weeping tile system.