Monitor a foundation crack
Cracks tell you what they're doing if you watch them long enough. Here's how to track movement at home.
What you'll learn
- Why a single measurement of a crack tells you nothing
- The taped-quarter test (free, takes 60 days)
- When to use a real crack monitor gauge ($15 from Amazon)
- How to photo-document with date and scale in the frame
- When stable readings = monitor; when widening = call us
Step by step
- Photograph the crack with a coin or ruler in frame and the date written on a sticky note.
- Tape a quarter across the crack with the edges aligned to the crack edges.
- Re-photograph at 30, 60, and 90 days using the same framing.
- Compare width and offset across the photos.
- Stable through 2 seasons = monitor annually. Widening = inspect now.
Safety note
We install free crack monitors on every inspection, even if you don't hire us. Monitoring before repair is the difference between an honest fix and an unnecessary one.
Rather have a pro handle it?
Same-day electrical service across San Diego County. A real electrician picks up.
More guides
Keep learning.
Troubleshooting · 5 min read
Spot foundation problems early
The 10 visible signs that something is moving under your house. Most homeowners miss these for years.
Troubleshooting · 4 min read
Measure your floor slope yourself
You don't need a Zip Level to know if your floor is sloping. A 4-foot level and a tape measure will get you 80% of the way there.
Maintenance · 6 min read
Improve drainage around your foundation
Three drainage interventions you can do this weekend that will protect your foundation for years.