Fifteen Years Old and Cracking: Not Unusual Here

There is a persistent assumption that foundation problems are an old-house issue. In Murfreesboro the numbers say otherwise.

A very young housing stock

American Community Survey figures for the city put the median year a Murfreesboro home was built at 2005. The distribution behind that median is worth seeing:

• Built 2020 or later: 7.1 percent
• Built 2010 to 2019: 30.4 percent
• Built 2000 to 2009: 24.4 percent
• Built 1990 to 1999: 12.8 percent
• Built 1980 to 1989: 10.5 percent
• Built before 1960: 4.6 percent

So roughly 62 percent of the city’s housing went up in 2000 or later, and fewer than one home in twenty predates 1960. Set against a Census Bureau estimate of 168,387 residents in July 2024, up 10.2 percent from the 2020 base, that is a city that has largely been built recently and quickly.

The consequence for foundations is that the typical problem here is not decay. It is a young house on ground that had to be shaped before it could be built on.

What a graded pad does

Rutherford County is not flat, and neither is the rock under it. To get a level building pad on rolling ground, a builder cuts into the slope on one side and fills on the other. The result is a house where part of the footing bears on undisturbed native material and part bears on placed fill.

Fill that was engineered, placed in lifts, and compacted to specification performs perfectly well. Fill that was not consolidates under load for years after the house is finished. Since the two halves of the footing are then settling at different rates, you get differential movement, which is the mechanism behind essentially all structural crack damage.

The USDA soil survey adds the local twist. Depth to limestone bedrock across the county ranges from about ten inches in the Gladeville series to over six feet in others, and a dissolved limestone surface is irregular rather than flat. A pad that needed two feet of fill at one end and six at the other is common, and those two ends do not behave the same.

The pattern to look for

Fill settlement on a new-ish house has a recognisable signature:

• A diagonal crack rising from a window or door corner, usually on the downhill side of the house
• A garage slab separating slightly from the foundation wall, or a driveway pulling away from the garage apron
• A floor that reads out of level in one consistent direction rather than dipping in the middle
• Cracking that appeared some years after completion rather than in the first winter
• Exterior brick veneer showing stepped cracking near a corner

Individually none of those proves anything. Together with a floor-level survey they make a clear case, and they distinguish fill settlement from the thing it is most often confused with.

The thing it is confused with

Every new house cracks a little. Framing lumber dries and shrinks, concrete cures and shrinks, plaster and drywall settle, and fine cracking at the corners of openings during the first year or two is normal enough that most builders’ warranties address it explicitly as a cosmetic item.

Telling that apart from genuine movement comes down to three things: when it appeared, whether it is still changing, and whether the floor has moved with it. First-two-years hairline cracking on a level floor is almost always shrinkage. Cracking that appeared in year six on a floor that now reads out of level is not.

The guide to reading cracks covers how to record widths and dates so you can answer the second question rather than guess at it.

If the house is still under warranty

Structural warranty periods on new construction typically run far longer than the cosmetic ones, and where a house is still inside that window, the builder’s warranty is the first avenue rather than a private repair contract. Read the documentation before commissioning anything, because commissioning your own repair can, in some warranty terms, complicate the claim.

If it is out of warranty

Then it is an ordinary foundation assessment: a floor-level survey to establish how much movement there is and where it stops, a read on the crack pattern, and a look at where water goes on the lot. On a graded subdivision pad the drainage question is usually not far behind the fill question, because a lot graded to a plan does not always end up shedding water the way the plan intended.

Cost figures and what each repair addresses are in the Murfreesboro foundation guide.