Stone foundations are most common in structures built before 1915. They were usually made of stones cut to fit together, and may be dry-laid or mortared. The interiors are often plastered.
Stone foundations are common in many structures with historic importance, including:
- Chicago townhomes
- Municipal buildings
- Farm buildings
The close proximity of these buildings to other, equally important structures is often a complicating factor when foundation repairs are necessary.
Signs a Stone Foundation Needs Repair
Signs that your stone foundation is sinking and needs to be repaired include:
- Bulging basement walls
- Sloping or uneven floors
- Sticking doors and windows
- Stair step cracking in walls
- Missing or shifted stones
- Crumbling mortar
Challenges of Stone Foundation Repair
Raising or stabilizing a stone foundation poses many difficult challenges.
- Made of many small pieces that become loose over time
- Aging mortar no longer uniformly transfers structural loads to footings
- Entire structure becomes very sensitive to movement
Because of preservation considerations related to historically important buildings, most owners choose to stabilize the foundation rather than raise it. This protects the integrity of the structure itself, and also mitigates potential risk to costly interior restoration work.
Why Pressure Grouting Works Best For Stone Foundations
All foundations are designed to be uniformly supported by soil, and this is especially important for stone foundations because they are made of many pieces that become loose over time. Outdated repair systems such as underpinning piers or piles are not suitable for stabilizing or raising stone foundations because they rely on single points of support. Pressure grouting methods compaction grouting and permeation grouting are uniquely suited for permanently correcting the soil instability that causes a sinking stone foundation.
- No excavation necessary to install
- Maintains uniform contact between foundation and soil
- Evenly distributed support prevents loose stone movement
- Completed repairs are undetectable, preserving historic integrity
- Installation equipment remains curbside, leaving property undisturbed
- Minimal space requirements, do not impact nearby structures
- Root cause of sinking is eliminated, preventing future problems
In addition to being less invasive and more successful, grout injection foundation repair techniques also cost less than conventional pier methods.
Call For An Estimate
Contact us today to schedule an appointment with one of our experienced engineers to evaluate your stone foundation and provide a customized repair quote.