Start with the Ground: Grading and Surface Water

Before you clean a single gutter, walk the perimeter of your house during a steady rain. Watch where the water goes. The goal is simple: surface water should move away from the foundation, not sit against it. Over time, soil settles, flower beds get built up, and patios shift. What drained well last spring may now hold puddles a few inches from the wall.

Begin with the soil itself. You want the ground to slope gently away from the foundation for at least the first several feet. You can check this with a long straight board and a level, or simply observe where puddles form after a storm. If water collects along the foundation line, add clean topsoil or fill dirt to build up the low spots. Tamp it down lightly and re-check the grade after a few weeks, as fresh soil settles.

  • Check downspout extensions: Make sure they carry water at least a few feet from the house. If they are too short, add a flexible or rigid extension.
  • Look for bare, compacted areas: These encourage runoff to pool. A layer of mulch or a patch of grass slows the water and helps it soak in gradually.
  • Inspect walkways and driveways: If a concrete slab sits against the foundation and slopes toward it, water will follow that path. You may need to adjust the grade around the edge or install a small channel drain.

This is the time to make small adjustments with a shovel and a wheelbarrow. Avoid creating a steep mound right against the wall, which can trap moisture against the siding. Instead, aim for a gradual, even fall. If you discover a serious depression where water gathers for hours, or if the foundation wall itself shows cracks or efflorescence, consider calling a foundation contractor or a licensed structural engineer for a site assessment before you start moving large amounts of soil. Grading is routine maintenance, but significant regrading or drainage installation is a project for a professional.

Gutters and Downspouts: Beyond the Obvious

Most homeowners think of gutters as a simple channel for rainwater, but the system only works well when every connection and attachment is sound. Before the heavy rain arrives, take a closer look at the hardware that holds the system together.

Start with the brackets and hangers that secure the gutter to the fascia board. Over time, nails can work loose or pull out slightly, leaving the gutter with a visible sag. Look along the front edge of the gutter for a straight, even line. If you see a dip or a bulge, that section is likely holding water instead of letting it flow. Tightening a loose screw or replacing a corroded nail is a safe do-it-yourself fix when the gutter is empty and accessible from a sturdy ladder.

Next, examine the seams where two gutter sections meet, especially on older metal systems. These are common leak points. On a dry day, run a gloved hand along the inside seam to feel for gaps or dried sealant. Small separations can often be sealed with a quality exterior caulk, but if the seam is pulling apart visibly, the bracket beneath may need attention.

Finally, check the downspout extensions. Water that exits the downspout too close to the foundation is a recurring problem. Confirm that the extension carries water at least a comfortable distance away from the house, typically onto a graded slope or splash block. A flex hose extension that has slipped off its connection is a simple fix. Avoid letting the extension rest against a walkway where water can pool and flow back.

  • Verify downspout elbows are firmly locked, not just resting in place.
  • Clear any debris caught near the downspout outlet, as this often causes backups.
  • If a downspout is buried or connected to a drain, confirm the end is unblocked and not crushed by landscaping.

Windows, Doors, and Seals: The Hidden Entry Points

While gutters and roof shingles get the most attention, water often finds its way inside through the gaps around your windows and doors. A heavy rain event turns a tiny, overlooked crack into a steady drip. The good news is that inspecting these areas is a straightforward job you can do yourself, provided you know where to look and what to replace.

Start with the weatherstripping on operable windows and doors. This is the flexible material that compresses when the sash or door closes. Run your hand along the edges and feel for any spots where air moves through. Also, look for visible wear: flattened foam, cracked rubber, or peeling adhesive. If the material is brittle or missing in sections, plan to replace it. This is a simple peel-and-stick task for most homeowners, but measure the existing track width before buying a replacement.

Next, examine the caulking, or sealant, on the exterior joints. Focus on the seams where the window or door frame meets the siding or stucco. Look for gaps, separations, or areas where the caulk has pulled away from the surface. Use a flathead screwdriver or a putty knife to gently probe suspicious spots. If the caulk is hard, cracked, or missing altogether, it needs to be removed and reapplied. This job requires a clean, dry surface, so wait for a stretch of dry weather to do the work.

  • Check the threshold: The bottom of your entry door is a prime leak point. Inspect the threshold pan and the door sweep. Look for rust, rot, or a sweep that no longer touches the floor.
  • Look for stains: Water stains on the interior drywall or wood trim around a window or door are a clear sign of a past or active leak.

If you find rotted wood in the frame or any sign of active mold, stop your DIY plan. That points to deeper structural moisture that needs a qualified contractor to assess and repair properly.

Landscaping and Drainage: Working with Nature

The ground around your home is the first line of defense against heavy rain, and its slope, texture, and covering do most of the work before water ever reaches the foundation. A simple walk around the house after a steady shower tells you a lot. Look for where water pools, where the soil stays dark and soft, and where mulch has washed onto walkways or flower beds.

Soil type matters more than most homeowners expect. Dense clay soils hold water and drain slowly, while sandy soils let rain pass through quickly. You cannot change the soil you have, but you can work with it. Adding organic matter, such as compost, improves the structure of both clay and sandy soils over time, helping them absorb water more evenly. This is a gradual process, best done in the spring and fall when the soil is moist but not waterlogged.

Mulch is a useful tool, but only when placed correctly. A layer two to three inches deep around plants slows runoff and reduces erosion. However, piling mulch against the siding or foundation traps moisture against the house, which can invite pests and rot. Keep a visible gap between the mulch line and the bottom of the exterior wall.

Plant placement also directs water. Deep-rooted shrubs and perennials planted in low spots help absorb excess moisture, while turf grass struggles in constantly wet areas. Consider these adjustments:

  • Redirect downspout extensions so water flows at least several feet away from the foundation.
  • Regrade low spots by adding topsoil and compacting it lightly, keeping a gentle slope away from the house.
  • Replace struggling grass in soggy zones with moisture-tolerant native plants.

For grading changes that involve moving more than a few inches of soil or working near the foundation, consult a landscaping professional. Routine raking, mulch refreshing, and soil amendment are safe weekend tasks you can handle yourself, provided the ground is dry enough to work.

Basement and Crawlspace: Check the Vulnerable Areas

Before heavy rain arrives, the lowest parts of your home deserve a focused walk-through. Start with the sump pump. Lift the cover and look inside the basin. Clear away any debris, dust, or small objects that could interfere with the float switch. Pour a bucket of clean water into the pit; the pump should activate and drain it within a reasonable time. If it does not, or if it runs continuously, schedule a service visit before the storm.

Next, inspect the walls and floor for cracks. You are looking for changes, not just existing lines. Use a flashlight and run your hand along joints where the floor meets the wall. Hairline cracks are common, but wider gaps, horizontal cracks, or any sign of fresh moisture, efflorescence (white powdery residue), or flaking paint can indicate water entry points. Sealing small gaps with hydraulic cement or a masonry crack filler is a manageable DIY task, but significant structural movement or bulging walls require a professional foundation contractor.

Finally, check ventilation and humidity. Crawlspaces and basements need consistent airflow to dry out after damp spells.

  • Confirm that vents are open and clear of leaves, dirt, or insulation that may have shifted.
  • Look for standing water, damp cardboard, or musty odors—all signs that moisture is lingering.
  • If a dehumidifier is in use, empty the reservoir and check the hose for clogs.

Keeping the humidity controlled now means surfaces are dry and ready to handle the next downpour. Tackle these checks on a dry day, and you will know exactly what is working before the sky opens up.

The Day Before: A Final Walkthrough Checklist

When heavy rain is forecast, the day before is your best window for a calm, unhurried check. The goal is not to fix major problems but to confirm that your routine maintenance is holding up. A focused walkthrough, done in a sensible order, takes less than an hour and gives you a clear stopping point.

Start outside, at the foundation. Look at the ground where it meets the house. It should slope away from the walls; if you see puddles forming against the foundation, that is a sign that soil has settled and may need to be re-graded in drier weather. Clear any leaves or debris from window wells and the bottom of exterior doors.

Next, check the gutters and downspouts from the ground. If you see water overflowing from the gutter during a light drizzle, or if plants are growing out of the trough, the system is clogged. Make sure downspout extensions carry water at least a few feet from the house. Also, confirm that the sump pump discharge line, if you have one, is not kinked or blocked.

Then, move inside. Complete this simple sequence:

  • Walk the basement or crawlspace with a flashlight, noting any damp spots on walls or floors. Dampness that appears before the rain is a sign of a chronic issue.
  • Check the floor around the water heater, washing machine, and any indoor spigots for moisture.
  • Ensure that any items stored on the basement floor are on shelves or pallets, off the concrete.
  • Clear the area near the sump pit so the pump can operate freely.

Finally, charge a flashlight and set it where you can find it in the dark. If you have battery-powered radios or backup phone chargers, verify they hold a charge. This is not about stockpiling; it is about having one working light and one working phone charger so you are not fumbling in the dark.

These checks rarely take long. They simply confirm that the season’s maintenance is in place, so when the rain arrives, you can stay inside and let it pass.