Sloping Floors in Texas Homes: Cosmetic or Structural?

Stand a marble on your floor and watch it roll, and your brain writes a horror story. Here's the calmer truth: almost every house in Central Texas has measurable floor slope, most of it was there a year after construction, and the number that matters isn't how much — it's which way, and whether it's still changing.

How much slope is normal?

Builders' own tolerances allow noticeable variation in a new slab, and decades of clay seasons add more. The working scale above is what we use in the field: under a half inch across 20 feet is universal background noise; the red zone — three-plus inches — is where active movement is the likely story. Between them is monitoring country, where trend decides everything.

Measure it yourself in ten minutes

• The marble map: roll a marble at several spots in each room and note direction and speed. You're sketching a contour map: do all the rolls drain toward one corner of the house?
• The board-and-level: an 8-foot straightedge with a level on top, gap measured at the low end, gives you real inches. Multiply by 2.5 for the per-20-feet figure.
• Date it: whatever you measure, write it down with the date. Six months later, the comparison is worth more than the original number.

What the professional version adds

Our free inspection replaces the marble with a ZipLevel altimeter reading 40+ points across the slab to a tenth of an inch — producing the elevation map that turns "feels slopey" into a diagnosis: stable, monitor, or repair, with the numbers attached. If it's the old, finished movement most Texas slopes turn out to be, you'll have the documentation that says exactly that — useful forever, especially at sale time.