Dry Stone vs Mortared Stone Walls: A New England Homeowner's Guide

A dry stone wall, also called a dry laid wall, is built without mortar. Each stone is chosen and placed so it sits solidly on the stones below, with joints staggered so no vertical seam runs straight up the wall. Wider walls are often built as two faces with smaller stones packed tightly in the middle, and long through stones are set across the wall at intervals to tie both faces together. The wall usually leans slightly inward as it rises, a slope called batter, which keeps the weight pushing toward the center.

The base matters as much as the stone. A proper dry wall sits on a trench of compacted crushed stone that drains freely. Because nothing is glued together, the wall can shift slightly as the ground freezes and thaws and then settle back, which is exactly why so many old walls are still standing.

A mortared wall binds the stones together with mortar and sits on a poured concrete footing. The footing has to go below the frost line so the ground cannot heave it, because a rigid wall cannot flex the way a dry wall does. Once the mortar cures, the wall acts as one solid mass.

Mortared walls can be built taller and thinner than dry walls, they can have crisp, straight tops and pillars, and they hold their shape precisely, which works well next to a driveway entrance or along a formal front yard. Stone veneer, a thinner face of natural stone set against a block or concrete core, is a related option when you want the look of solid stone with a structural core behind it.

Frost is the deciding factor in this part of the country. Winters here bring repeated freeze and thaw cycles, and wet soil expands as it freezes. A dry wall tolerates that movement: stones lift a little, then settle, and an individual stone that pops loose can be reset in minutes.

A mortared wall handles frost only if the footing is deep enough and the wall drains well. When water gets trapped behind or inside the wall and freezes, it can crack mortar joints, and once cracks open, more water gets in each winter. That is why a well built mortared wall includes drainage behind it, weep openings where needed and a cap that sheds water. Done right, it lasts decades. Done on a shallow footing, it often cracks within a few seasons.

Stone wall pricing varies widely, so take these as broad market ranges. Dry laid fieldstone walls are often priced by the face foot (length times height) and commonly fall somewhere around $40 to $100 or more per square face foot, depending on the stone, the height and how much excavation the site needs. Mortared walls usually cost more because of the concrete footing, the mortar work and the extra labor, often landing in a higher range per face foot.

The biggest variables are the stone itself (reclaimed fieldstone from the property is cheaper than purchased stone, while cut granite or bluestone caps add cost), the wall height, access for equipment, and whether the wall is freestanding or holding back soil. A short garden border is a very different job from a long wall along a road frontage.

A freestanding wall marks a boundary or frames a garden and has soil at the same level on both sides. A retaining wall holds back a slope, so it carries real pressure from soil and water behind it. Dry stone can retain modest grade changes when it is built wide, battered and well drained, but taller retaining walls usually call for engineered block or a reinforced design.

If the wall you are picturing is holding up a slope, say so early. The design, drainage and cost change significantly, and some towns have rules for walls above a certain height, so check with your local building department before you build.

Choose dry stone if you want a natural, rustic wall that matches the old walls along New England roads, if the wall is freestanding or holds back only a small grade, and if you like the idea of a wall that can be repaired stone by stone. Choose mortared stone if you want clean lines, pillars or a formal entrance, if the wall needs to be tall and narrow, or if it sits right next to hardscape where shifting stones would be a problem.

Many properties end up with both: a dry fieldstone wall along the back of the lot and a mortared or veneered wall at the front entrance where it gets seen every day.

Machado Landscaping builds stone walls, retaining walls and stone veneer for homeowners and builders, with over 25 years of hands-on construction experience behind the work and fair pricing on every job. We can look at your site, the stone you already have and the look you want, then explain the options. The estimate is free with no visit fee. Call (508) 663-9401 and we reply within 1 hour during business hours, Monday through Saturday.