What We Commonly Find in St. Louis Homes Built in the 1970s and 1980s
Homes built in the 1970s and 1980s make up a large part of the housing stock throughout the St. Louis suburbs. These houses may not feel particularly old, but many have now been through 40 to 50 years of Missouri summers, wet springs, dry spells, landscaping changes, renovations, and repairs.
At Perma Jack of St. Louis, one of the biggest mistakes we can make is judging a home simply by its age. We inspect homes from this era that have old cracks but very little evidence of current movement. We also see homes that look relatively clean upstairs but show foundation settlement, bowed walls, drainage problems, or previous repairs once we take a closer look.
The important question is not whether a 1970s or 1980s home has changed since it was built. Most homes have. We want to know whether the structure is stable today or whether something is still moving.
Decades of Missouri Soil Movement Start to Add Up
Foundation problems around St. Louis are closely tied to the soils beneath and around the home. Clay-rich soils can change volume as moisture conditions change, shrinking during extended dry periods and expanding again when they take on water. Perma Jack has seen this seasonal cycle contribute to settlement and foundation movement throughout the region.
A house built in 1978 has now been through decades of those wet and dry cycles. That does not mean the foundation is automatically damaged, but it gives small differences in soil support a long time to become visible. One corner may settle more than another, or pressure against a basement wall may gradually create cracking or inward movement.
This is why we often see foundation problems concentrated in one part of a home instead of spread evenly around the entire structure. The soil, drainage, grading, and construction conditions are rarely identical on every side.
Cracks, Uneven Floors, and Bowed Walls Need Context
Cracks are common in houses that have been standing for several decades. What matters more is the pattern, location, and whether the crack appears to be changing.
We may find stair-step cracking in masonry, cracks through basement walls, drywall cracks above doors and windows, or old cracks that have been repaired once or twice before. A crack that has looked the same for 20 years tells us something very different from one that recently opened, widened, or returned after being patched.
The same is true of uneven floors and sticking doors. A slightly sloped floor may have been that way for years. If the floor has recently changed and there are new exterior cracks, gaps around windows, or doors that suddenly do not latch, those symptoms deserve more attention.
Bowing basement walls are another condition we encounter. Soil outside the basement places lateral pressure against the wall, and saturated soil can increase that pressure. Over many years, that can contribute to horizontal cracking, inward bowing, or other wall movement.
We do not choose a repair based on one crack or one measurement. We want several pieces of evidence to point toward the same cause.
Drainage Around a 40- or 50-Year-Old Home May Be Very Different Than When It Was Built
One of the biggest changes we see around homes from this era is not necessarily the foundation itself. It is everything that has changed around the foundation.
Landscaping gets replaced. Trees mature. Patios and additions are installed. Driveways are replaced. Downspouts get shortened, moved, or buried. Soil settles around the house, and the original grade can change over time. An area that drained well when the home was built may now direct water toward the foundation.
That matters because poor grading and concentrated roof runoff can increase soil saturation around the basement. In some homes, water problems and structural problems exist at the same time. In others, correcting drainage may be an important part of protecting a foundation that is otherwise stable.
We look at gutters, downspouts, grading, low spots, and where water is moving around the property because the current drainage pattern matters more than what was probably there several decades ago.
Previous Repairs Tell Us a Lot About the House
By the time a home from the 1970s or 1980s reaches us, we may not be the first company to have worked on the basement or foundation.
We sometimes find patched cracks, steel braces, anchors, added posts, old waterproofing systems, repaired drywall, drainage work, or evidence that a previous homeowner tried to solve a problem themselves. Those repairs become part of the home’s history.
An old repair does not automatically mean something went wrong. A foundation repair performed years ago may still be doing exactly what it was intended to do. What interests us is what has happened since then.
If an old crack repair has reopened, a wall has continued moving beyond a previous brace, or new settlement has developed in another part of the home, that helps us understand where movement may still be active. On the other hand, an old repair that has remained unchanged for decades may be evidence that the condition has been stable.
We want to understand what has already been done before recommending something new.
Finished Basements Can Hide Part of the Story
Many homes from this period have been remodeled or finished at some point after construction. That can make foundation evaluation a little different because portions of the basement walls may now be hidden behind drywall, insulation, cabinets, or other finishes.
In those situations, we pay close attention to the symptoms we can see. Cracks in drywall, doors that are out of alignment, flooring changes, gaps around trim, exterior masonry cracks, and floor elevations can all help us understand what may be happening behind the finished surface.
A finished basement does not prevent us from evaluating the structure, but it makes the relationship between different symptoms even more important. We do not want to assume that every drywall crack is a foundation problem, just as we do not want to dismiss a pattern of cracks because the concrete wall itself is not visible.
What We Look for During an Inspection
A home built in the 1970s or 1980s has decades of history behind it, so we try to understand that history rather than expecting the structure to look new.
| What We Check | What It Helps Us Understand |
|---|---|
| Crack patterns | Whether movement may be structural or localized |
| Floor elevations | Whether one part of the home has settled |
| Basement walls | Whether lateral pressure has caused movement |
| Doors and windows | Whether openings are changing with the structure |
| Exterior masonry | Whether settlement is visible outside |
| Drainage and grading | How water currently moves around the foundation |
| Previous repairs | What conditions have already been addressed |
| Finished basement areas | Whether visible symptoms suggest hidden movement |
| Additions and garages | Whether different parts of the home are moving differently |
| Homeowner observations | Whether the condition is new, changing, or longstanding |
No single item makes the diagnosis. We are looking at how the pieces fit together.
A stair-step crack near one corner becomes more meaningful if the floor elevations also drop toward that area and nearby doors have recently changed. An old horizontal crack may be less concerning if measurements and homeowner history suggest the wall has remained stable for years.
Not Every Older Foundation Needs to Be Repaired
This is worth emphasizing because homeowners sometimes assume that a 40- or 50-year-old house is simply reaching the age when foundation repair becomes inevitable.
That is not how we look at it.
We inspect homes from this era that have imperfections but do not show evidence of ongoing structural movement. In those situations, monitoring may be appropriate. An old crack does not need foundation piers just because it exists, and a slightly uneven floor does not automatically need to be lifted.
When we do find active settlement, bowing walls, water problems, or another condition that needs attention, the repair should match the cause. That may involve foundation stabilization, wall repair, crack repair, drainage improvements, basement waterproofing, or a combination of solutions.
The goal is not to make a 1970s home look like it was poured yesterday. The goal is to determine whether the structure is performing properly today.
Have a St. Louis Home Built in the 1970s or 1980s?
If your home was built during the 1970s or 1980s and you have noticed foundation cracks, uneven floors, bowed basement walls, sticking doors, or recurring water problems, our team can help determine what those symptoms actually mean.
At Perma Jack of St. Louis, we look at the foundation, floor elevations, drainage, previous repairs, and the history of the home before recommending a solution. Sometimes we find active movement that should be repaired. Other times we find an older condition that appears stable and can simply be monitored.
If something around your home has changed or you are unsure about an old foundation problem, contact Perma Jack of St. Louis to schedule a foundation inspection.
