Poway lost a lot of homes to fire in a short span. The City’s hazard-mitigation annex counts 53 single-family homes destroyed in the 2003 Cedar Fire. Four years later, Witch Creek destroyed 95 structures in Poway, 90 of them primary single-family homes.
Most of those lots were rebuilt. The rebuilds went up fast, often in the years right after each fire. That puts a lot of Poway houses in the same age bracket now: somewhere between sixteen and twenty-two years old.
That’s not old. It’s not new either. Here’s what that means for the foundation.
The first-decade settling is done
New houses settle. Fill compacts. Concrete cures and shrinks. Most of that happens in the first few years.
By year sixteen or so, that early movement is behind you. A hairline crack that showed up in year two and never changed is probably part of the house’s history.
A crack that’s still changing is a different story. At this age, ongoing movement usually has a cause you can find: water, a slope, a tree, a leak.
What changed around the house
Here’s the thing people miss. The house didn’t change much in twenty years. The lot did.
When a rebuild was finished, the yard was bare or freshly planted. Now there are mature trees. Irrigation lines have been added, moved and patched. Somebody built a patio, a pool, a retaining wall, a shed. Downspouts got rerouted. The neighbor regraded their side.
Every one of those changes affects water. Water is what moves soil.
Walk your lot and answer these honestly:
- Do any trees now stand within a few feet of the foundation?
- Has the irrigation been expanded since the house was built?
- Does any added hardscape slope toward the house?
- Did anyone fill in or block a drainage swale that was part of the original grading?
- Do the downspouts still go where they were designed to go?
If the answer to any of those is yes, that’s where to look first.
The slopes behind you grew back
After a fire, burned slopes lose the plants that hold soil in place. The California Geological Survey’s guidance on geohazards after wildfire explains that burned areas are prone to increased runoff, erosion and debris flows until vegetation recovers.
On most of these lots, the hills have grown back. That’s good. But some homeowners added walls, drains or terraces in the rough years right after the fire. Those were built for a burned slope. Twenty years on, it’s fair to ask whether they’re still working.
Check:
- Retaining walls for leaning, cracking or bulging.
- Slope drains and brow ditches for silt and debris.
- Weep holes in walls that have plugged up.
- Any spot where soil is building up against the house or a wall.
If the rebuild reused an old foundation
Some rebuilds went onto brand-new foundations. Others reused part or all of the original foundation after it was evaluated.
Find out which you have. Our post on finding rebuild records walks through how to request the file from the City. The City Records page explains how records requests work.
If your house sits on a reused foundation, that foundation is older than the house. Its age matters more than the framing’s age when you’re reading cracks.
If the records don’t say whether the reused foundation was evaluated before the rebuild, treat that as an open question. Don’t assume.
Leaks show up around now
Twenty years is about when plumbing starts to act its age. Supply lines, fittings and irrigation valves wear out. A slow leak under a slab or in the yard can soak the soil for months before anyone notices.
The signs are easy to miss. A water bill that creeps up. A warm spot on the floor. A patch of grass that stays green in August. A damp area next to the foundation when it hasn’t rained.
Do a simple test. Turn off every fixture and the irrigation. Read the water meter. Wait an hour without using water. Read it again. If the meter moved, find out why. Poway’s own leak-detection page walks through the same idea.
Fix the leak first. Then deal with any soil damage it caused.
Keep a simple file going forward
You probably have a folder of rebuild paperwork somewhere. Add to it. Each year, put in:
- Dated photos of any cracks you’re watching.
- Notes on drainage changes, new hardscape or new plantings.
- Receipts and permits for any work on walls, drains or the foundation.
The next owner will want it. So will anyone you hire.
Signs that are worth a closer look at this age
Not every crack means something. These do:
- A crack that’s grown since the last time you measured it.
- A crack in the slab that lines up with a crack in the drywall above it.
- Doors that used to close fine and now drag or won’t latch.
- Gaps opening between the house and the patio, driveway or garage slab.
- Floors that feel out of level in one area.
- Water pooling at the foundation after rain.
- A wall or slope that’s moved since you last looked.
Take dated photos with something for scale. Measure the same cracks every few months. That record does more than any single snapshot.
What not to do
Don’t patch cracks before someone looks at them. Patching hides the evidence.
Don’t add more fill against a wall that’s leaning.
Don’t drill or cut a post-tension slab without checking the plans first.
Don’t assume the original soils report covers changes you made later. It doesn’t.
Grading changes need a permit
If fixing drainage means moving soil, check the City’s grading permit rules first. Poway requires grading permits for many kinds of earthwork. A drainage fix that reshapes a slope can trigger one.
The California Residential Code also requires lots to drain water away from foundations. A rebuild met that when it was finished. Your job is to keep it that way.
When to call
If you see ongoing movement, don’t wait for it to get worse. An evaluation at this stage looks at the foundation, the drainage, the slopes and the records together. Anyone you hire should coordinate with licensed engineers as needed when the findings call for it.
What it costs depends on what’s found: the foundation type, the soil, the slope, whether walls or drains need work, access, and permits. Get those factors spelled out before you talk numbers.
Read more on our post-wildfire evaluation page and our foundation cracks page. We cover all of Poway. Ready for a look? Request a Free Quote.