Technique to Repair Rubble Foundation – Part 2
In our last post, we discussed why using lime-based mortar is the only correct way to repair an antique foundation. In this post, we’ll look at the specific techniques we use to stabilize rubble stone walls, seal out pests, and give the basement a clean, finished appearance.
The Challenge: Deep Crevices in Rubble Stone Foundations
Our first project is a classic Massachusetts stone foundation. The original masons used lime mortar inside the wall, but they tightly fitted the stones to make it look like a dry-stacked wall. Over time, the mortar recedes, creating deep crevices that become home to dust, spiders, and even chipmunks.
Our Process: Deep Injection Repointing
To properly stabilize this wall, we turn to our trusty Quikpoint mortar gun. While some masons try to point these walls by hand with a trowel, a mortar gun allows us to inject the lime mortar deep into the structural crevices where a trowel simply can’t reach.
Why We Use LimeWorks Mortar
As discussed in Part 1, we utilize a specialized hydraulic lime mortar. It has excellent workability, the correct “pan life” for deep injection, and most importantly, the vapor permeability required for New England’s damp soils. It allows the foundation to breathe while providing a solid structural bond.
The Results: A Sealed, Stable, and Brighter Basement
A full cellar restoration usually takes 3 to 4 days. The transformation is dramatic—not only is the wall structurally sound, but the lighter color of the fresh lime mortar brightens the entire space and creates a much cleaner environment.
By filling the voids completely, we eliminate the “highways” that pests use to enter the home and stop the constant shedding of grit and dust from the old, failing mortar joints.
Expert Historic Foundation Repair in Central MA
If your historic basement looks like the “before” photo below, it may be time for a professional evaluation. We specialize in historic stone foundation repair and basement repointing throughout Lancaster, Wayland, Concord, and the MetroWest area.
If you would like a quote on stabilizing your antique masonry, please call 978-365-6800 or complete our online request form.
