Which Signs Actually Matter
Most cracks are not an emergency. A handful genuinely are. Here is how to tell them apart before anyone quotes you anything.
In Tallahassee, hairline slab cracks under about 1/8 inch that are not widening are extremely common and frequently require no structural repair at all.
Cracks wider than about 1/4 inch, cracks that are still widening, and horizontal cracks in a block wall are the ones that warrant an engineer's opinion.
An independent structural engineer's report in the Tallahassee area costs $400-900 and carries no incentive to recommend work.
The free test to run first
- Draw a pencil line across each crack at its widest point and write today's date next to it.
- Photograph it with a coin or tape measure in frame for scale.
- Look again after three months, ideally spanning a wet-to-dry or dry-to-wet transition, which is when Tallahassee clay does its moving.
- If nothing has changed, you have a crack. If it has widened, you now have evidence - and evidence is what stops you being sold work you may not need.
Sorted by how much they matter
| What you see | How concerning | Usual Tallahassee response |
|---|---|---|
| Hairline drywall cracks at door corners | Low | Monitor; cosmetic repair |
| Vertical crack, stable | Low | Usually shrinkage; seal if water gets in |
| Slab crack under 1/8 inch, stable | Low | Monitor; seal if water intrudes |
| Doors sticking seasonally then freeing up | Low to medium | Usually clay moisture cycling |
| Crack widening over two seasons | Medium | Engineer's assessment |
| Crack wider than 1/4 inch | Medium to high | Engineer's assessment |
| Horizontal crack in a block wall | High | Assessment promptly |
| Floor sloping visibly to one corner | High | Assessment promptly |
| Gaps where exterior brick meets the frame | High | Assessment promptly |
Why seasonal sticking doors are usually good news
A door that binds every August and works fine every February is describing something reversible. The clay under that part of the house is swelling in the wet season and releasing in the dry one, and the frame is flexing with it. That is clay doing what clay does.
A door that started sticking two years ago and has never freed up again is describing something that did not come back. That is the version worth investigating, and the difference between the two is simply whether you have watched it across a season.
Common questions
Should I worry about a crack in my foundation?
Most of the time, no. Hairline cracks under about 1/8 inch that are not widening are extremely common and frequently need no structural repair at all. What matters is whether it is moving - pencil a line across it, write the date, and look again in three months. A crack that has not moved is a crack, not a diagnosis.
Are vertical or horizontal foundation cracks worse?
Horizontal, by a wide margin. A vertical crack is usually shrinkage or ordinary settlement and is often sealed rather than repaired. A horizontal crack in a block or masonry wall means the wall is being pushed sideways by soil or water pressure, and that one warrants an engineer's opinion promptly.
How much does foundation repair cost in Tallahassee?
Minor crack repair runs $400-1,500. Most full jobs in this area land between $2,300 and $8,200, depending on how many piers are needed and whether drainage work is included. Only badly affected homes go beyond that. An independent engineer's report costs $400-900 and is the only assessment in this market with no financial stake in the answer.
A contractor offered a free inspection. Is that a bad sign?
Not by itself - free inspections are standard in this industry. Just remember the inspection is a sales call, and the person doing it is paid when work happens. For anything large, get an engineer who is paid the same regardless.
How fast can foundation problems get worse?
Usually slowly, over seasons rather than days, which is exactly why the three-month pencil test works. Anything that changes suddenly is a different situation - a plumbing leak washing out soil, for example - and that does warrant a quick call.
Can I sell a house with a monitored, stable crack?
Commonly yes, and documentation helps. A file showing dated photographs of a crack that has not moved in two years is far more reassuring to a buyer than a fresh patch of paint over it.