The ground line tells you what a fence needs. Eye level rarely does. Most repair-or-replace advice compares two prices, and in Texas that comparison starts in the wrong place, because the condition of the wood at the bottom of your posts has usually already decided the answer. Dig at one post before you take a bid.
Check the Post at the Ground Line Before You Price Anything
Push on a panel. If the post moves and the pickets stay put, the post has already failed, whatever the boards look like from your patio. Wood only rots when it stays wet, and serious decay needs a moisture content above the fiber saturation point, an average of 30%, while air-dried wood usually holds at or under 20% (USDA Forest Products Laboratory, 2021). The bottom few inches of a buried post never get to dry out.
That is why the inspection happens down low. Four checks tell you almost everything before anyone quotes you.
- The screwdriver test. Push a screwdriver into the post at the soil line. If it sinks in past a quarter inch with hand pressure, that post is spent.
- The lean test. Grab the post itself and rock it, leaving the pickets alone. Movement at the base means the wood or the concrete collar has given up.
- The ground line ring. Look for a dark, soft band right where the post meets the dirt. Rot starts there and works up.
- The count. Walk the whole run and test every post, including the far corners. The number of bad posts is the decision.
A homeowner who tests two posts and stops has not inspected a fence. They have sampled it.
The Repair-or-Replace Rule Holds, With One Texas Correction
Isolated damage on a young fence is a repair, and spread damage on an older one is a replacement. Griffin Fence draws that line at 1 to 3 boards, a single post, or gate hardware on a fence under 12 years old that is otherwise sound. It calls for replacement when multiple posts have failed, when 30% or more of the boards are damaged, or when the lean runs across several sections.
That rule is right, and we use the same one. The correction is that age means different things in different parts of Texas. A 12-year-old fence in Dallas and a 12-year-old fence in Kingwood are not the same fence, because the ground under them is doing different work.
There is a money line too. Griffin Fence puts it at 50%: once the repair estimate passes half the cost of a full replacement, replacement is the better buy. We agree, with one addition. Compare the repair to a replacement that is actually specified correctly, or you are comparing your repair to the same fence that just failed on you.
What “Ground Contact” and “Heartwood” Mean on a Fence Bid
The words on a bid decide how long the new fence lasts, and two of them do most of the work. The wood-preservation industry’s Standard U1 puts fence posts in Use Category 4A, general ground contact, and sets a minimum preservative retention for long-term service in soil (American Wood Protection Association, Standard U1). A post treated to a deck-rail retention and put in the dirt is a post that will rot early.
| Term on the bid | What it actually means | Why it decides repair or replace |
|---|---|---|
| Ground contact (UC4A) | Preservative retention specified for wood buried in soil | A post below this retention fails at the ground line first, no matter what the pickets cost |
| Heartwood vs sapwood | The dark inner wood resists decay; the pale outer wood does not | Cedar pickets cut mostly from sapwood gray out and rot years early |
| Ground line | The band where post, soil, and air meet | Nearly every wood fence failure in Texas starts in this 4-inch band |
| Embedment | How deep the post sits in concrete below grade | Shallow embedment shows up as seasonal lean while the wood stays sound |
| Picket grade (#1 to #3) | The grade of the picket, by knots and defects | A bid that says “cedar” without a grade number is not yet a spec |
Ask which grade of picket a repair quote is using. A repair that mixes a #3 picket into a #1 fence is visible from the street in a year.
How Fast Wood Fails Depends on Which Texas Metro You Are In
The federal decay hazard index puts Houston at 77.2 and Dallas at 44.3, which is the difference between the high-hazard band and the middle of the moderate one (USDA Forest Products Laboratory, 2009). Same state, same species, very different clock. Houston humidity keeps the ground line damp for more of the year, and damp is the only condition rot needs.
| Texas metro | Decay hazard index | Where that sits | Source |
|---|---|---|---|
| Houston | 77.2 | High hazard band, above the 65 threshold | USDA FPL, 2009 |
| Austin | 55.2 | Moderate band (35 to 65) | USDA FPL, 2009 |
| San Antonio | 52.2 | Moderate band (35 to 65) | USDA FPL, 2009 |
| Dallas | 44.3 | Moderate band, lowest of the four metros | USDA FPL, 2009 |
Read the age rule through that column. A Houston fence at 10 years deserves a hard post inspection before anyone spends a dollar on repairs, because the ground line has been working on those posts the whole time. A Dallas fence at 10 years more often has good posts and tired pickets, which is a genuine repair.
Clay Moves the Post Even When the Wood Is Sound
Not every failed post is a rotted post. Houston Black, the Texas state soil, runs about 60% to 80% clay and carries very high shrink-swell potential across the Blackland Prairie from Dallas south to San Antonio (USDA Natural Resources Conservation Service, 2023). It swells wet and shrinks dry, every year, and it pulls on anything set in it.
The signature is a fence that tilts a little more each season and stands up straighter after a wet spell. Corners and gate posts go first, because they carry the most load and have the least help from neighbors. If you pull one of those posts and the wood is clean but the concrete collar is loose in the hole, the fix is a deeper hole and a bigger footing. Preservative will not touch it.
That distinction changes the repair. Resetting a clay-heaved post at the same depth in the same hole buys you two seasons. Resetting it deeper, in a properly sized footing, is real work that costs real money, and once three or four posts need it, the arithmetic has already tipped.
But Repairing Half a Fence Buys You Half a Fence’s Life
A repair only resets the clock on the parts you touched. Griffin Fence prices a post replacement at $200 to $400 including labor and concrete, and gate hardware at $75 to $200. Three posts and a gate on a fence whose remaining posts are the same age, in the same soil, is most of a thousand dollars spent on a fence that will ask again next year.
| What you find on the walk | The call | Why |
|---|---|---|
| One loose post, the rest solid | Repair that post | Isolated failure, no pattern along the line |
| Three or more loose posts along the run | Replace the fence | The remaining posts are the same age in the same soil |
| Soft rot ring at the ground line on spot-checked posts | Replace the fence | Rot at the ground line runs the whole line |
| Gray, cupped pickets over sound posts | Repair or reface the pickets | The part that failed is the part that is cheap to change |
| Repair estimate nearing half a replacement estimate | Replace the fence | You are paying half price for none of the service life |
Price is exactly why we push people toward the honest version of this comparison. We are Master Halco’s largest-volume customer, holder of their 2026 Largest Volume Customer awards for the Southwest Region and the World, and a top customer of Solid Wood. That buying power sets our picket cost, and we pass it through. It is the reason a correctly specified replacement from us often lands closer to a patchwork repair than homeowners expect, at the same grade of wood, named on the quote.
