Stone Masonry Restoration

Typical Problems with Natural Stone Masonry

Here are some of the most common issues we encounter when working with natural stone masonry in Ozaukee County and the North Shore area. These problems often develop slowly over decades due to the region’s harsh winters, moisture infiltration, and occasional use of incompatible repair materials in the past. Identifying them early helps prevent more extensive damage to the stone and underlying structure.

• Powdered or crumbling stone surfaces: Especially on softer limestones exposed to road salt or extreme weather. 
• Bulging or leaning walls: Often from foundation settling or poor drainage pushing against the stones.
• Damage from past portland cement repointing: Hard cement creates a rigid shell that cracks and traps water, harming the softer stone around it.
• Spalling and flaking: Common on limestone and sandstone when moisture freezes inside the pores and pops off thin layers.
• Eroded or recessed joints: Original lime mortar washes out over time, leaving gaps that let more water in.

How We Restore Stone Masonry

We start by closely evaluating the specific stone (limestone, Lannon stone, fieldstone, etc.), its condition, and the original mortar. Masonry repairs are chosen to match in strength, flexibility, and behavior so the wall continues to perform as intended.

Our process typically includes:

• Careful removal of failed mortar to protect stone edges.
• Gentle cleaning of joints and surfaces using low-pressure water or soft brushing.
• Repointing with natural hydraulic lime or type N mortars, matched to the original in color, texture, and composition. These stay flexible and compatible with the stone.
• Replacement of damaged individual stones, sourcing similar local or matching material when feasible.
• Full deconstruction of bulging or failed walls, followed by careful rebuilding using salvaged original stone whenever possible, or sourcing closely matching replacement stone when needed.

The outcome is masonry that retains its classic appearance, blends seamlessly, and holds up better against local weather than mismatched modern fixes.