Foundation care · the wet side
Downspouts & grading: the cheap fixes to try before you dig a drain
This is the page the drainage industry would rather you skip, because it costs almost nothing and it solves most of the problem. Before you spend a dime on a buried French drain, two unglamorous fixes handle the majority of foundation-water trouble on North Texas clay: getting roof water away from the slab, and making the ground slope away from the house. Here's how to check both, what good looks like, and how to know when you genuinely need more.
Most "foundation drainage problems" aren't subsurface mysteries — they're roof water dumped at the slab and a grade that tilts the wrong way. Both are surface problems with cheap, surface fixes. A buried drain is the expensive last resort, not the starting line.
Fix 1: get the roof water away from the slab
Start here, because roof water is enormous and most people underestimate it. One inch of rain on an average roof is over a thousand gallons — and a downspout that empties next to the foundation puts most of that straight into the soil that holds your slab up. You can solve a lot of foundation worry by simply moving that water somewhere else.
Walk the house and trace every downspout to where it actually lets out. Any that discharge within a few feet of the slab are the problem. The fix is to get that water four to six feet out, minimum — farther is better on clay — using either:
Add-on extensions or splash blocks that carry water out past the foundation soil. Cheap, visible, and easy to adjust. The downside is they're in the way of the mower and can get knocked loose, so they need an occasional check.
The downspout drops into a buried solid pipe that runs out to a pop-up emitter in the yard, so nothing's visible and nothing's in the way. More work up front, but it stays put and keeps the water well clear of the slab.
Either way, the principle is the same: roof water is the single biggest, most controllable source of water against your foundation, and it's the cheapest to redirect. Handle it first.
Fix 2: make the ground fall away from the house
The second suspect is the grade — the slope of the ground right at the foundation. Water goes where gravity sends it, and if the dirt against your house is flat or tilts back toward the slab, you're funneling water exactly where you don't want it.
A common target is roughly six inches of fall over the first ten feet out from the foundation. The exact number matters less than the direction: it has to go away. Here's what quietly reverses it over the years:
Ground slopes away from the house, not toward it.
Soil and mulch sit below the slab line, not piled against the brick.
No low trough cupping water right at the foundation.
Water visibly moves away during a rain and the area drains within about an hour.
Why these two come before anything you dig
Two reasons. First, cost — extensions and minor grade work are a tiny fraction of a buried drainage system, and they're often something you can do yourself. Second, and more important: they fix the actual cause for most homes. Roof water at the slab and a reversed grade are the two most common sources of foundation water in North Texas, and a French drain installed without addressing them is fighting a battle that a cheaper fix should have ended first.
This is also the honesty filter for any contractor you call. If someone recommends a French drain before they've looked at where your downspouts let out and which way your grade falls, that tells you something about whether they're solving your problem or selling their most profitable line item.
When the cheap fixes aren't enough
Sometimes you do both and water still won't behave. That's not a failure — now you know, instead of guessing, that you have a deeper problem and which kind:
- The soil itself stays saturated for days after you've handled the roof water and grade → that's subsurface water, and a properly designed French drain may be warranted.
- Water is sheeting across a hard surface like a driveway and flooding at the garage → that's surface water crossing concrete, and a channel drain catches it.
Either way, you spent the cheap money first and only moved to the expensive fix once you'd proven you needed it. That's the right order, and it's the order I'll always walk you through.
Do it yourself, or call someone?
Plenty of this is honest DIY territory. Downspout extensions are a weekend job. Pulling beds back and filling a low spot to restore fall is within reach for a lot of homeowners. Where it's worth a professional eye: bigger regrades, buried downspout lines, and — most of all — anything that decides where the water ultimately ends up, because a fix that floods your neighbor or overwhelms a shared easement isn't a fix.
If you'd rather just have someone tell you what your specific yard needs, that's what the free look is for. I'll trace your downspouts, read your grade, and tell you straight whether this is a weekend you can knock out yourself or something worth hiring for. If it's the weekend job, I'll point you at it and you'll owe me nothing — that's the whole idea.