What is a PVR (Potential Vertical Rise) map?

Potential Vertical Rise is an engineering estimate of how many inches an expansive clay soil can swell or shrink as its moisture content changes, calculated by engineers from the soil's measured properties. A PVR map shows that capacity across a region. It does not show what your soil is doing today. It shows what your soil is capable of doing when moisture conditions change.

What is the PVR in my part of Houston?

Values vary street to street, but typical ranges in our service area: Sugar Land around 5 to 6 inches, Missouri City around 5 inches, central Houston near the Medical Center around 5 inches, the Energy Corridor around 1.5 to 4 inches, northwest Houston around 1.5 inches, Katy and Fulshear roughly 1.5 to 4 inches, and Fort Bend County generally 2 to 5 inches. A site-specific geotechnical report is the only way to know your exact number.

Does a high PVR mean my foundation will have problems?

No. PVR describes the soil's capacity, not your foundation's fate. A slab foundation on high-PVR clay was engineered to float and move with that soil. Homes on 5 to 6 inch PVR clay perform well for decades when the moisture conditions around them stay balanced. Problems come from the conditions that move moisture unevenly: tree roots, drainage, plumbing leaks, and sun exposure, not from the PVR number itself.

My foundation has moved more than my area's PVR. What does that mean?

This is one of the most useful comparisons in foundation diagnostics. When a foundation's measured differential exceeds the soil's theoretical capacity for the area, normal seasonal soil behavior alone cannot explain it, and external moisture drivers such as tree root activity, drainage patterns, or plumbing influence are likely the dominant force. That points the investigation at causes that can often be corrected, which is exactly what an independent assessment with a full elevation survey is designed to determine.

Does a low PVR mean my foundation is safe?

Lower capacity means less potential seasonal movement, but no clay soil in the Houston region is immune to concentrated moisture change. A large tree against a slab or a long-term drain leak can produce significant differential movement even on modest-PVR soil. The number sets expectations. It does not replace measurement.

Where does PVR data come from?

PVR values are calculated by engineers from soil data gathered through geotechnical borings and published soil surveys. Regional maps like this one aggregate that data to show typical ranges by area. For a specific property, a geotechnical engineer calculates PVR from borings on the site itself.

Houston PVR Map · Potential Vertical Rise

Your Soil Can Move
More Than 6 Inches.
Here's The Map.

Potential Vertical Rise (PVR) is the engineering estimate of how far the expansive clay under your home can swell and shrink as moisture changes. It is the single most important number in Houston foundation behavior, and almost nobody selling foundation repair will ever show it to you.

See The Map & Your Area ↓ Book A Foundation Assessment

What PVR Actually Means

The soil's capacity, not your foundation's fate.

Houston sits on expansive clay, soil that swells when it takes on water and shrinks when it dries. PVR is an engineering estimate of how many inches of vertical movement that clay is capable of as its moisture content changes. It is not a prediction. It is a measure of what the ground under your home can do.

Here's what matters: PVR is not a prediction of damage. A slab foundation on high-PVR clay was engineered to float and move with that soil. That is not a flaw, it is the design. Homes on 5 and 6 inch PVR clay perform well for decades when the moisture around them stays balanced.

Trouble starts when something moves moisture unevenly: a thirsty oak on one corner, a grading problem on one side, a drain line leaking under the middle. The PVR number tells you how big the soil's response to those conditions can be. In Sugar Land, the same tree causes three times the movement it would cause in a lower-PVR zone.

The One Comparison That Matters

Your foundation's measured differential (from a full elevation survey)
vs.
your soil's theoretical capacity (the PVR for your area)

When the measured movement exceeds what normal seasonal soil behavior can produce, external moisture drivers like roots, drainage, and plumbing are the dominant force. That is a cause you can investigate and often correct, before anyone talks about piers.

This comparison is built into every Pier-less professional foundation assessment.

The Houston PVR Map

Find your zone.

Darker zones hold the most reactive clay. The southwest side, Sugar Land, Missouri City, and much of Fort Bend County, carries some of the highest PVR values in the region.

Houston PVR map showing potential vertical rise of expansive clay soils across Greater Houston, Sugar Land, and Fort Bend County TX

⬇ Download The PVR Map (PDF)

Typical PVR By Area

How far can your soil move?

Typical ranges from regional soil data. Values vary lot to lot, and a site-specific geotechnical report is the only exact answer, but these are the working numbers we apply in assessments across our service area.

Sugar Land · 77479

5" – 6"

Among the most reactive clay in the region

Missouri City · 77459

~5"

High-capacity clay under established neighborhoods

Central Houston · 77030

~5"

Medical Center, Braeswood & nearby

Fort Bend County · General

2" – 5"

Richmond, Rosenberg & surrounding communities

Energy Corridor · 77077

1.5" – 4"

West Houston along I-10

Fulshear & Katy · 77441+

1.5" – 4"

The new construction corridor

Northwest Houston · 77095

~1.5"

Copperfield & Cypress area

Why This Changes The Diagnosis

A 2-inch differential in Copperfield is a very different finding than a 2-inch differential in Sugar Land. Same measurement, different soil capacity, different story. And when a home's measured movement exceeds its area's PVR, like 4.5 inches on 1.5-inch clay, seasonal behavior alone cannot explain it. Something specific is driving it. Finding that something is the whole point of an independent assessment.

PVR Questions

What homeowners ask about this map.

The Map Shows Capacity. A Survey Shows Reality.

Now Find Out What Your
Foundation Is Actually Doing.

A full-footprint precision elevation survey, read against your soil's PVR and the environmental conditions around your home, by licensed, independent inspectors. We determine what it's doing, what may be causing it, and what to do next. No repair sales.

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Your Soil Can Move More Than 6 Inches. Here's The Map.