historic brick facade with star-bolt for structural reinforcement

Caring for Historic Masonry

Jan 4, 2022 4:48:38 PM Christina Wilson

Owning an old brick home in DC involves caring for historic masonry. Homeowners in the know develop a good eye for detecting trouble spots before they take over. Preserving the value and integrity of older brick homes can become a point of pride for owners.

Annual inspections are the primary defense against these issues becoming a financial disaster that could keep you out of your home during repairs. 

Let's discuss which issues to look for during that inspection, what is likely causing it, and when you need a professional to deal with it.   

DIY of Old Brick Homes

Most issues are not those that you can or should DIY. However, we will point out some conditions you might tackle yourself if you have the time, tools, and talent. 

Typically, old brick homes in historically designated neighborhoods require permitting before any structural repairs. Tuckpointing is included. Our clients are always glad to know that Renaissance Development handles all permitting for every job that requires it, large or small.

Your best bet is to contact the professionals at Renaissance Development for recommendations regarding your old brick home so that you can make an informed decision. 

Bulging or Bowed Bricks

We’ve discussed this issue many times over the years. Our most recent was When Your Retaining Wall Needs Help. In that article, we discussed this while this is not an uncommon problem among older brick homes, it should not be taken lightly.  A structural engineer should assess structural damage. 

If the structure's integrity is intact, the bulging and bowing could be due to the expansion and contraction of the bricks and mortar and moisture getting behind the bricks.  

Compacted or "Untrue" Bricks

Misshapen or compacted bricks create a condition that weakens the other bricks surrounding the compacted brick. This could be a serious problem because it will permit water to get behind the brick causing more problems. 

What's more, an untrue or compacted brick will cause more stress on its surrounding bricks. So, it would be best to get a professional to look at this condition right away and consult a structural engineer about adding the necessary support to the foundation.

Near-Vertical Corner Cracks

Near-vertical corner cracks are a natural result of settling and rarely affect the building's structural integrity.  Professionals usually recommend one of two inexpensive fixes. First, an epoxy or urethane injection fills the crack, or expansion joints relieve some corner pressure. 

Tuckpointing will restore the brick's mortar after applying any structural remedies that may be necessary.   

Deteriorating or Disintegrating Mortar

The brick's mortar will last 25 or 30 years, in most cases. After that, certain atmospheric conditions such as rain and snow, salt from the city's winter road clearing, and too high-pressure washing can exacerbate and hasten the mortar's deterioration. An easy cure for an old building is tuckpointing with historically appropriate materials. In addition, regular upkeep prevents costly repairs down the road.   

Above the Shelf Angle Spalling

Some structures may include a shelf angle, which is a metal beam or plate that bears the weight of the bricks above it. Over the years, the shelf angle rusts and corrodes from moisture. Then, the bricks begin chipping or cracking. 

If the shelf angle is too corroded, it will need to be replaced. Then, the spalled bricks will also require replacement and the mortar repointed.  

Efflorescence on Exterior Bricks

Most historic brick homes in DC were built long before 1930. In that building era, masons used sand and lime to make mortar. Lime has minimal salt, which causes efflorescence or the powdery, white salt build-up sometimes seen on bricks. 

Moisture accumulation can aggravate efflorescence, so consulting an expert about drainage issues may be appropriate. You can clean small patches with a biodegradable detergent, water, and a stiff-bristled brush. Do not use a high-pressure wash on old brick and mortar, as that treatment can lead to rapid mortar deterioration. 

Mold, Mildew, or Moss 

Typically, these "M" conditions are not hazardous to your brick wall. However, as with efflorescence, these often are indicators of moisture retention and inadequate drainage.  Consult a professional. 

Final Thoughts

Many of these conditions are natural with age. But, for better or worse, older homes need more attention. However, in most cases, tuckpointing by a professional can save you more expensive repairs down the road. 


Be sure the repair or replacement of your historic stone or brick home goes without a hitch. Renaissance Development experts cut through the confusion and fuss of getting your property back in its best condition in the shortest time possible. Contact us for a consultation today.

Categories: Historic Preservation, Exterior brick, preventive maintenance

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