Should You Worry About Sloping Floors in Older Homes?

Whether you should worry about sloping floors in an older home depends on what is causing the slope. Sloping floors are common in older homes, and many come from years of gradual settling that is not a structural problem on its own. A slope that comes with sticking doors and windows, wall cracks or stair step cracks in masonry can point to foundation damage or decayed floor framing, and an inspection shows which you have.

This article covers why floors slope in older homes, when it matters and how sloping floors are repaired.

Why Do Floors in Older Homes Slope?

Generally, sloping floors are more commonly found in older homes than newer ones. The reason for this is that it typically takes a considerable amount of time for a floor to slope to the point that it is easily noticeable.

For example, some sloping floors are the result of accumulated damage or decay to the structural components that support the floor. This is especially true of wooden floors, as rotted joists and broken boards can all cause a floor to become unlevel.

However, there are many instances in which the cause of a sloping floor has nothing to do with damage to the floor itself. Instead, many sloping floors in older homes arise as a result of settling.

After a house is built, it is common for the soil below the house’s foundation to shift gradually over time. This is most prevalent when the soil has not been properly compacted, meaning that it has many small pockets of air within it.

Since the soil supports the foundation, and thus the rest of the house, if it shifts or sinks, the foundation will usually shift or sink to the same degree. A small amount of settling is to be expected, but some houses settle far more dramatically than others.

In many older homes, enough settling has occurred over the decades that the entire house has become uneven. The slope of a floor is often one of the easiest ways to recognize that unevenness.

An older home settling is not something that should cause concern on its own. Despite being uneven, a settled house is not necessarily structurally unsound, meaning that a sloping floor is also not necessarily something that should cause immediate concern.

But with that said, a sloping floor can also be a sign of foundation damage. A damaged foundation can cause a similar shifting effect as normal settling does. It can also result in sloping floors.

So a sloping floor alone does not show whether an older home has a structural problem, and it is hard to judge on your own. An inspection can find the cause of the slope and whether it needs repair.

How Much Slope Is Too Much?

Some signs anyone can look for suggest a slope is worth checking: windows and doors that stick, cracks in walls and stair step cracks in masonry. These often point to a deeper cause.

The amount of slope matters too. Some slopes are so slight you may not notice them, while others are steep enough to trip on. There is no single number that decides it. If a slope bothers you or is getting worse, an inspection can tell you what is causing it and what a repair would involve.