When a heavy rain is in the forecast, most families think about flashlights, batteries, and whether the driveway will flood. One of the most important places to check is less obvious: the area where water meets your house. If that “handoff” isn’t working, rainwater can end up where you don’t want it—along your foundation, in your basement or crawl space, and even inside walls.
The good news is that a quick, practical check of your gutter and downspout system (plus the nearby grading) can prevent a lot of headaches. You don’t need to be a contractor to spot common problems, and you can fix many of them in an afternoon.
Why this part of your home matters so much
Your roof sheds an enormous amount of water during a downpour. Gutters catch it, downspouts move it down, and extensions or drains carry it away from the house. When any link in that chain fails, water tends to concentrate right at the foundation. That’s where you’ll see issues like:
• Basement or crawl-space dampness and musty odors
• Water stains along foundation walls
• Erosion or “trenches” in landscaping
• Pooled water near entry steps or garage slabs
• Ice buildup in winter climates (when drainage is already poor)
Not every wet basement is caused by gutters, and not every crack is a crisis. But checking the drainage path is one of the simplest, highest-impact steps you can take before the next storm.
Start with a ground-level walk-around
Before you climb anything, do a slow loop around your home at ground level—preferably after a normal rain when you can see where water naturally wants to go. If it hasn’t rained recently, you can still look for clues.
Watch for:
• Splash marks on siding close to the ground
• Soil that’s sunken next to the foundation (a sign of settling or washout)
• Mulch that’s displaced or piled against the wall
• Water lines on basement windows or window wells
• Downspouts that end right at the foundation
If you notice low spots where water could pool, make a note. You don’t need to diagnose everything today—just identify where runoff is likely collecting.
Check the gutters: the most common failure point
Gutters are supposed to be boring. When they’re working, you barely notice them. When they’re not, the signs can be subtle until the rain is heavy enough to expose the problem.
1) Look for clogs and slow drains
Leaves, seeds, shingle grit, and even small branches can create dams. During a downpour, that trapped debris forces water to spill over the front edge—often right next to the foundation.
What to do:
• From the ground, look for plants growing from the gutter or dark “mats” of debris.
• If you have a stable ladder and feel comfortable, clean gutters by hand (gloves) and use a garden hose to flush toward the downspout.
• If the gutter overflows even after cleaning, you may have a clog in the downspout (more on that below).
2) Confirm the gutters are pitched the right way
Gutters need a slight slope so water flows toward the downspout. If the pitch is off, water can sit in long sections, inviting debris buildup and causing overflow at the wrong spots.
Signs of poor pitch include standing water after a rain or visible sagging between hangers. If you see a “belly” in the gutter line, it may need additional hangers or adjustment.
3) Inspect seams, corners, and end caps
Most gutter leaks happen at seams and joints. During heavy rain, a small drip can become a steady stream that runs down fascia and siding and lands at the foundation.
Look for:
• Rust, staining, or mineral deposits near seams
• Water marks on fascia boards
• Drips beneath corners even when water is flowing normally
Some minor leaks can be addressed with gutter sealant appropriate for your gutter material, but if multiple joints are failing or metal is deteriorating, replacement sections may be more practical.
4) Make sure gutters are firmly attached
High winds and ice can loosen hangers. A gutter that pulls away from the fascia can dump water behind it instead of inside it. That water can rot wood over time and show up later as staining or soft spots.
From the ground, look for gaps between the gutter and the fascia or places where the gutter line looks wavy. If you can gently move the gutter by hand (from a ladder, safely), it likely needs re-fastening.
Downspouts: where water should leave the house—far from the foundation
Even perfect gutters won’t help if downspouts don’t move water away efficiently. This is one of the most overlooked parts of storm prep because downspouts “look fine” at a glance.
1) Confirm every downspout actually discharges away from the house
If a downspout ends at the base of the wall, it can concentrate thousands of gallons of roof runoff right next to your foundation over the course of a season. A simple extension can make a big difference.
Practical options include:
• A rigid or flexible downspout extension that carries water farther out
• A splash block to prevent erosion right at the exit point
• A buried drain line tied to an appropriate outlet (where allowed and properly installed)
Whatever method you use, the goal is the same: water should not dump right at the foundation.
2) Check for clogs in the downspout itself
Downspouts can clog with leaves, tennis balls, roof grit, or even nests. When that happens, water backs up and overflows at the gutter line.
Simple ways to check:
• During a light rain, see if water is exiting normally.
• During a dry period, flush the gutter toward the downspout with a hose and watch for steady discharge.
• If it trickles or backs up, the blockage may be in an elbow near the bottom or at a tight bend.
If you’re clearing a clog, avoid forcing sharp tools that might puncture thin metal. Sometimes removing the bottom elbow is enough to clear the blockage safely.
3) Make sure connections are secure
Downspouts can separate at joints or elbows. In heavy rain, water can shoot out of the gap and erode soil fast. Look for misaligned sections, missing screws, or areas that have slid apart.
Don’t skip the grading: water should flow away from the house
Your gutters and downspouts handle roof water, but the soil around your home determines whether any surface water drains away or comes right back. Over time, soil can settle, mulch can build up, and garden beds can unintentionally form a “bowl” that traps water near the foundation.
What to look for:
• Ground that slopes toward the house instead of away
• Low spots near corners (common after landscaping or patio work)
• Mulch piled high against siding (which can hide moisture issues)
Small improvements—like re-leveling soil so it gently slopes away—can help reduce pooling. If you’re unsure how to correct drainage without creating new problems, a local professional can assess grading and runoff patterns.
Pay special attention to these trouble spots
Some areas of a home are more likely to collect water or reveal drainage problems. Give these a closer look before a big storm:
Valleys and roof transitions: Roof valleys move a lot of water quickly. If a gutter under a valley is undersized or clogged, it can overflow dramatically.
Inside corners and downspout clusters: Areas where multiple rooflines feed into one gutter/downspout can overwhelm the system if it’s partially blocked.
Window wells: If you have basement window wells, keep them clear of leaves and make sure they can drain. Debris-filled wells can collect water and push it against windows.
Garage edges and entry steps: These areas often reveal pooling first. If you see puddles forming after rain, it’s a signal to revisit downspout discharge and grading.
Quick fixes you can do this weekend
Not every solution requires a major project. If you want the biggest impact before the next heavy rain, focus on these practical steps:
Clean gutters and downspouts. Removing debris restores capacity and helps you spot loose hangers or leaks.
Add or adjust downspout extensions. Make sure water exits away from the foundation rather than at the base of the wall.
Reattach loose sections. Tighten or replace missing fasteners on downspouts and add hangers where gutters sag.
Use splash blocks where needed. They’re simple, inexpensive, and help prevent trenches and erosion.
Clear drains and window wells. Anything designed to move water needs to be free of leaves and sediment to work.
If you’re doing ladder work, use safe practices: stable ground, a spotter if possible, and avoid reaching too far to the side. If your roofline is steep or high, consider hiring help rather than pushing your comfort level.
How to tell if the problem is bigger than gutters
Sometimes you’ll do everything “right” and still see water issues. That doesn’t mean your efforts were wasted—it means you’ve eliminated a common cause and can look deeper.
Consider getting professional guidance if you notice:
• Repeated basement seepage even when gutters are clean and extended
• Cracks in foundation walls that appear to be widening
• Doors or windows sticking more than usual (could indicate shifting)
• Persistent standing water that doesn’t drain within a reasonable time after rain
Professionals can evaluate drainage, sump pumps (if you have them), exterior waterproofing, and other site-specific factors. The key is to address recurring water entry early—before it becomes a larger repair.
A simple “before the storm” checklist
If you want a quick routine to run through when heavy rain is forecast, keep this list handy:
• Walk the perimeter and look for low spots and puddle-prone areas
• Clear visible debris from gutters and downspout openings
• Confirm downspouts are connected, unclogged, and discharging away from the foundation
• Check that splash blocks or extensions haven’t shifted
• Make sure window wells and nearby drains are clear
• Move outdoor items that block drainage paths (bins, planters, toys)
It doesn’t take long, and it puts you ahead of the worst surprises—like discovering during the storm that one corner of your home has been taking all the runoff.
The bottom line
Before the next heavy rain, the smartest place to check is the system that carries roof water away: gutters, downspouts, and the ground right around your foundation. A little attention there can help protect the parts of your home that are hardest and most expensive to repair.
Clean what’s clogged, tighten what’s loose, and make sure water exits well away from the house. Your future self—especially the one listening to rain pound the roof at 2 a.m.—will be glad you did.