What We Find in St. Louis Homes Built in the 1950s and 1960s
St. Louis has a huge number of homes built during the postwar housing boom, especially throughout the 1950s and 1960s. Many of those homes are now 55 to 75 years old, which means their foundations have been through decades of seasonal soil movement, heavy spring rain, dry Missouri summers, landscaping changes, and repairs made by more than one generation of homeowners.
We inspect a lot of homes from this era, and one thing we have learned is that age by itself does not tell us whether a foundation needs repair. Some homes built in the 1950s have several old cracks but show very little evidence of current movement. Others look fairly clean at first and then reveal active settlement, bowing walls, or water problems once we start looking at the whole structure.
The important question is not whether a 60-year-old foundation looks perfect. It is whether the home is still changing.
Block and Poured Concrete Foundations Are Both Common
Most of the homes we inspect from this period are built on either concrete block or poured concrete foundations. We see a mix of both throughout the St. Louis area.
The foundation type matters because movement tends to show up differently. Block walls have mortar joints, so settlement and lateral pressure often reveal themselves through stair-step cracking, horizontal mortar joint cracks, or movement through several blocks. Poured concrete walls tend to crack through the wall itself, which can create different patterns.
We do not judge the condition of a foundation based only on whether it is block or poured concrete. We use the construction type as one part of the inspection because it helps us understand how the wall has responded to decades of soil pressure and settlement.
Stair-Step and Diagonal Cracks Are Common in These Homes
One of the most common things we find in 1950s and 1960s homes is diagonal or stair-step cracking. In many cases, these cracks are connected to differential settlement, where one part of the foundation has moved more than another.
Poorly compacted fill soil is something we see regularly when evaluating these homes. Soil that was disturbed during construction may not have provided the same long-term support as undisturbed soil. Over time, that can lead to settlement concentrated in one section of the house.
A stair-step crack does not automatically mean a home needs major foundation repair. We want to know how old the crack is, whether it has changed, whether there is displacement, and whether other areas of the home show signs of movement.
We have inspected plenty of older homes where the crack has been there for decades and appears stable. We have also inspected homes where a similar crack was clearly getting worse. The crack pattern matters, but the history of the movement matters even more.
Poorly Compacted Fill Soil Can Show Up Years Later
Homeowners are often surprised when we explain that a problem showing up today may have started with conditions created during the original construction of the home. When a foundation is built, some areas around the structure are excavated and then filled back in. If that fill soil was not compacted well enough, it can settle over time. The movement may be slow enough that a homeowner does not notice much for years.
In St. Louis, seasonal changes in soil moisture can make this more noticeable. Dry summer conditions can cause clay-rich soils to shrink, while wet periods can cause them to expand again. Those changes can expose areas where support beneath the foundation was already weaker than the rest of the house. This is one reason settlement often shows up in one section instead of evenly around the entire foundation.
Bowing Basement Walls Are Also Common
Bowing basement walls are another condition we see often in homes from this period. A basement wall has to resist pressure from the soil outside, and that pressure can change as moisture levels rise and fall. When the soil becomes saturated, the lateral force against the wall can increase. Over many years, that can lead to horizontal cracking, inward bowing, or visible wall movement.
We pay close attention to horizontal cracks in block walls because they can show where the wall has been under repeated pressure. We also look at how far the wall has moved, where the bow is located, and whether drainage conditions outside may still be contributing to the problem. A bowed wall usually has a history. It is rarely something that developed in a single season.
Many of These Homes Were Not Built With Modern Waterproofing Systems
Another thing we commonly find is that many homes from the 1950s and 1960s do not have the kind of basement waterproofing system homeowners expect today. That does not mean the basement always leaked. Some homes stayed dry for decades before water problems appeared. The conditions around the home can change over time as grading settles, downspouts are rerouted, drainage lines age, landscaping changes, and foundation cracks develop.
This is why we often hear, “My basement was dry for 40 years. Why is it leaking now?” In many cases, the foundation did not suddenly fail. The way water moves around the home changed slowly over time until the basement could no longer handle it the same way.
Old Waterproofing Paint and DIY Repairs Tell Us a Lot
We see plenty of waterproofing paint, patched cracks, mortar repairs, and other DIY fixes in basements from this era. We do not automatically view those repairs as a bad thing. Homeowners were usually trying to solve the problem they could see at the time. What matters to us is what those repairs tell us about the history of the basement.
A painted wall may point to a past moisture issue. A crack that has been patched more than once may suggest recurring movement or seepage. Old coatings can also cover some of the signs we would normally use during an inspection, so we pay attention to where those repairs were made and whether the surrounding area is still changing. These old repairs become part of the story of the house.
Older Cracks Do Not Always Need Immediate Repair
This is one of the most important things we tell homeowners. A 60- or 70-year-old house is allowed to have some history. We do not expect every foundation from this era to be perfectly crack-free or completely level.
We often find older cracks or settlement that appear to have been stable for a long time. If we are not seeing signs that the condition is progressing, monitoring may make more sense than recommending a structural repair right away.
We become more concerned when something is changing. A crack that keeps widening, a repaired crack that opens again, new stair-step cracking, increasing wall movement, or doors and windows that suddenly start sticking can all point to active movement. The age of the crack matters less than whether it is still changing.
What We Look For During an Inspection
When we inspect a 1950s or 1960s home, we are looking at much more than the most obvious crack in the basement. We look at the foundation type, crack patterns, wall movement, previous repairs, signs of moisture, and exterior drainage. We also pay attention to how the house is behaving above the foundation. Uneven floors, sticking doors, masonry separation, and recurring drywall cracks can all give us useful information.
Our goal is to separate old movement from active movement. A home may have settled years ago and remained stable ever since, or the settlement may still be progressing. That distinction drives the recommendation.
What We Look For During an Inspection
When we inspect a 1950s or 1960s home, we are looking at much more than the most obvious crack in the basement. We look at the foundation type, crack patterns, wall movement, previous repairs, signs of moisture, and exterior drainage. We also pay attention to how the house is behaving above the foundation. Uneven floors, sticking doors, masonry separation, and recurring drywall cracks can all give us useful information.
Our goal is to separate old movement from active movement. A home may have settled years ago and remained stable ever since, or the settlement may still be progressing. That distinction drives the recommendation.
What These Homes Have Taught Us
After decades of inspecting St. Louis homes from the 1950s and 1960s, we have learned not to judge an older foundation simply by the number of cracks it has.
We regularly see block and poured concrete foundations that have performed well for more than half a century even though they are not perfect. We also see diagonal and stair-step cracking tied to poorly compacted fill soil, bowing basement walls, older DIY waterproofing attempts, and homes that were built without modern waterproofing systems.
The common theme is that the history of the house matters. A crack, old patch, or bowed wall is not enough on its own to tell us what the repair should be. We want to know what has changed, what has stayed the same, and whether the structure is still moving today.
Contact Perma Jack of St. Louis
If you own a St. Louis-area home built in the 1950s or 1960s and have questions about foundation cracks, basement wall movement, settlement, or water intrusion, we can help.
We have spent decades inspecting and repairing the block and poured concrete foundations found throughout St. Louis’ mid-century housing stock. Our team will evaluate what you are seeing, look at the home’s repair and drainage history, and determine whether the condition appears active, stable, or something that should simply be monitored.
Contact us to schedule a foundation inspection.
