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Foundations and Masonry Work

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Ask the Experts

Why Are There Dry Joints in My Brick Walls?

A historic-preservation expert suggests possible purposes for an intentional gap between interior courses of brick.

By Fine Homebuilding Editors Issue 281 – Feb/Mar 2019
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Where’s the mortar? Builders of the past left mortar out of joints for various reasons, from moisture management to vibration control. On interior brick walls, it was once common practice to install strips of wood in bed joints to allow for the easy attachment of trim and of furring strips for lath and plaster. A dry joint may result if the wood rots out or is removed with the original finishes during a renovation.

I live in Sea Bright, N.J., in a converted, two-story brick warehouse that was built in the early 1890s and sits about 300 ft. from the ocean. The walls are all solid with no cavities between wythes and are three wythes thick on the ground floor and two wythes thick on the second floor.

While doing demolition in preparation for adding a third floor, I removed drywall and noticed an unusual (and disturbing) detail in the brick masonry. Every 32 in. or so up the wall, there is a dry joint between the brick courses with no mortar whatsoever. After noticing this in my building, I have seen identical conditions in several other buildings in town that have exposed original brick walls.

Do you have any idea why this was done and what purpose it served? The walls have been there for over 100 years and seem to be holding up fine, but as I’m adding a floor, I’m sure you can understand my concern. Do you have any suggestions about strengthening or stabilizing the walls at these joints? Or should I just leave well enough alone?

                                                          —Robert, via email

Brent Hull, a nationally recognized authority on historic design, responds: There are a few possibilities for these dry joints. First, there is a precedent for using an unmortared brick line as a moisture-control barrier. Typically these areas would have been tarred, or a layer of tar paper would have been laid between joints to stop water from wicking. The idea was to prevent water at the ground level from going up or to keep water from filtering down from a parapet wall at the top of a building. If the joints are on the second floor, they could be for controlling water migration. If that’s the case, it may be difficult to see the waterproofing material from your vantage point.

The second possibility is vibration control. In this case, joints were purposely laid dry so that there would be a break in the mass of the brick wall. This break (mortar not joining the mass together) prevents vibration and minor movement from traveling up the entire wall. We don’t see this in Texas, where I live, but it may have been a local practice in Sea Bright, where a railroad passed through from the mid-1860s until well into the 20th century. As you know, the town is very narrow, and nearly every building would have been close to the tracks in the late 1800s.

If there’s a noticeable gap, there’s a third possibility. It used to be common to put wood every so often up interior brick walls to have something to nail to, and we see that all the time in our historic work. Often these were just pieces of lath laid on the flat in the joints, and they extend back only about an inch to attach trim or furring strips for lath and plaster. It’s possible that the wood was there and has just rotted out or was pulled out during a previous renovation when the original lath and plaster was removed.

As for what to do now, your walls likely don’t need any major remediation. Have a mason or engineer check them out to see if the purpose of the joints can be determined. If they were there for vibration or moisture control, leave the walls alone. These walls have worked for more than a century. Even if you wanted to “fix” them, I’m not sure how you would go about it. If it’s just a case of missing nailers, the bricks are likely partially supported, but it probably wouldn’t hurt to have a mason repoint the dry joints. Whatever the case, I think this construction technique offers a unique insight into the issues craftsmen faced in the past. It’s a fascinating piece of history, in my opinion.

Drawing: Dan Thornton

From Fine Woodworking #281

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  1. RichBeck | Jan 24, 2019 06:29pm | #1

    I was always told that brickwalls like that had wood in them we're built that way so that if there was a fire the walls would collapse inward as the wood burned out of that space. it was described as a fire safety thing so
    walls did not fall outward onto people other buildings.

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