# Signs of Hidden Moisture Around an Arizona Foundation

- Link: https://propertyinspectionsplus.com/hidden-moisture-arizona-foundation-signs/
- Published: 2026-10-24T09:25:46+00:00
- Author: homeinspectordan

This Arizona home looks well maintained on the surface. Underneath, there are clear
signs of long-term moisture and some air pressure issues that need attention. Here’s
what to look for around your own foundation.

## Warning signs outside

 * **Rusty nails and pitting in the stem wall.** When steel inside concrete rusts,
   it expands and cracks the concrete around it. That’s a sign of moisture over 
   a long time.
 * **A vertical crack at grade with water pooling against it.** That’s a direct 
   path for water into the foundation.
 * **Rusted metal form ties** that are expanding and cracking the concrete.
 * **Poorly sealed expansion joints and incorrect grading** that sends water toward
   the house.
 * **Damage from an old leak** near the main water valve, with stucco cracking along
   the front patio slab.
 * **Spray foam along the bottom of the garage.** Foam isn’t waterproof. It’s a 
   temporary fix that won’t keep water or pests out for long.

## Moisture readings in the garage

I checked moisture around the garage slab and behind the water softener. Some spots
were dry, but others read over 15%, most likely from irrigation and landscaping 
nearby. Moisture like that can lead to slab movement, and over time it attracts 
[termites](https://propertyinspectionsplus.com/termite-inspection/).

## Air pressure problems inside

 * **A choked return:** in the attic, the filter sits right up against the return
   vent, so the system struggles to breathe. That strains the equipment and cuts
   airflow to the rest of the house.
 * **Slamming doors:** without jumper ducts, bedroom doors slam shut when the AC
   kicks on. A few simple changes would fix it.

I also ran a leak test on the upstairs shower pan to make sure it wasn’t dripping
into the kitchen below. A [thermal imaging inspection](https://propertyinspectionsplus.com/thermal-imaging-inspection/)
is a great way to find leaks like that without opening walls.

## What you can do

 * Keep sprinklers and drip lines off the foundation.
 * Make sure soil slopes away from the house.
 * Seal foundation cracks and expansion joints properly instead of with foam.
 * Replace AC filters regularly and make sure the return has room to breathe.

## Watch the inspection

See every finding in the video above, or [watch it on YouTube](https://www.youtube.com/watch?v=FsI9jDh_Yb8).
[Book your inspection online](https://app.spectora.com/home-inspectors/my-inspection-company-f8d6dbae4e/schedule)
or call [623-399-0079](https://propertyinspectionsplus.com/hidden-moisture-arizona-foundation-signs/6233990079).

Property Inspections Plus is a [Gilbert, AZ home inspection](https://propertyinspectionsplus.com/)
company led by Certified Master Inspector Dan Pierce. We inspect homes across the
East Valley, the Phoenix metro and the rest of Arizona. See all of our [service areas](https://propertyinspectionsplus.com/service-areas/).