Why this skill matters

Most residential structural damage has the same root cause: water deposited at the foundation over years.

Gutters collect the rain that hits the roof — thousands of gallons per year on a typical residential roof. Where those gallons go after they leave the downspout determines whether they evaporate harmlessly in the yard or saturate the soil at the foundation, working their way into the basement, compromising the footing, or contributing to the slow freeze-thaw cycling that cracks the foundation wall over decades.

A clogged gutter defeats the entire system. Clogged gutters overflow over the edge, depositing water in the worst possible location — the soil immediately adjacent to the foundation. A downspout that discharges at the house base instead of 6+ feet out does the same thing. Soil that slopes toward the foundation directs every rain event toward the structure instead of away from it. Each of these failures is silent and slow — the damage accumulates over years before it becomes visible inside the house.

The maintenance in this guide — cleaning gutters twice a year, adding a $5 downspout extension, re-grading soil that has settled toward the foundation — is the cheapest category of protection available in residential maintenance. The cost comparison: two hours and a garden hose vs. $3,000–$15,000 in foundation repairs from chronic water deposit. No other maintenance task in this section has a comparable return on time invested.

What you should be able to do

L1 Household Basic

Clean gutters twice a year — spring and late fall — and clear clogged downspouts

Flush and verify slope — gutters should drain toward the downspout without pooling

Install downspout extensions that discharge 6+ feet from the foundation

Seal leaking gutter joints with gutter sealant

Assess foundation grade — identify areas where soil slopes toward the house

Manage ice dams with calcium chloride — and know the prevention approach

L2 Capable Homeowner

Re-slope a sagging gutter section by adjusting hangers

Replace a damaged gutter section or downspout length

Re-grade soil around the foundation to restore positive drainage

Install a simple surface swale to redirect water away from a trouble area

Tools and supplies

The L1 kit is a ladder, a hose, and a $5 extender.

L1 — cleaning, sealing, and extensions

Extension ladder. Must reach the eave safely — the top of the ladder should extend 3 rungs above the eave line when the base is at the 4:1 angle. Position on flat, stable ground. Never lean the ladder against the gutter itself.

Gutter scoop. A plastic trowel designed to fit inside the gutter profile. Makes debris removal faster than hands only. $5 at hardware stores, or use a child's sandbox scoop.

Garden hose with spray nozzle. For flushing after cleaning. The spray function clears fine debris; the stream function clears downspout blockages.

Downspout extenders ($5–$15). Rigid plastic sections or flexible corrugated tubes that attach to the downspout elbow. One per downspout. The highest-ROI purchase in this entire skill set.

Gutter sealant. Silicone or polyurethane gutter sealant — not standard exterior caulk. For leaking joints from inside the gutter. Flex Seal, Liquid Rubber, or Geocel gutter sealant.

L2 — grading and gutter repairs

Spike-and-ferrule gutter hangers or hidden clip hangers (for re-sloping and replacing failed hangers)

Tin snips — for cutting gutter sections to length

Topsoil in bags — for re-grading along the foundation

Hand tamper — for compacting the added soil to prevent settling

4-foot level — for assessing foundation grade and verifying corrected slope

Common problems — causes and indicators

Follow the water. Where it goes after it leaves the downspout tells you everything.

Clogged gutters and downspouts

Leaves, needles, seed pods, and roof debris accumulate. Signs: overflowing gutters during rain (water pours over the edge rather than going into the downspout), plant growth in the gutter, or standing water after rain has stopped. Frequency: clean twice a year as a minimum — more often with heavy tree canopy. Clogged downspouts are identified by running a garden hose into the top and watching whether water backs up.

Sagging gutter sections

Gutters should slope 1/4" per 10 feet toward the downspout. Sagging sections hold standing water, breed mosquitoes, accelerate rust in steel gutters, and overflow before reaching the downspout. The weight of debris and ice accelerates hanger failure. Identify by walking below the gutters and looking for a section that dips below its neighbors, or by filling with water and watching for pooling.

Downspout discharging at the foundation

The most widespread drainage problem. Every house should have downspout extenders. A downspout that ends within 3 feet of the foundation deposits its entire load at the house base with every rain event. This is the leading cause of foundation saturation and basement water intrusion in homes with otherwise functional gutters. Identify by checking where each downspout terminates.

Negative foundation grade

Soil that slopes toward the house. This happens as original grading settles over time, as mulch is piled against the foundation (it compresses and creates a bowl), or as the building settles slightly. Identify: after a rain, stand 6 feet from the foundation and watch which direction puddles run. If they run toward the house: negative grade. Also visible with a 4-foot level held on the soil at the foundation.

Ice dams (cold climates)

Heat escaping through the attic melts snow on the warm upper roof. Meltwater runs down to the cold eave and refreezes, building an ice ridge. Water pools behind the dam and is forced under the shingles into the attic and walls. Contributing factors: clogged gutters (water can't drain), poor attic insulation (too much heat escaping). Indicator: large icicles hanging from gutters, and icicles near the roof line rather than just at the eave.

Step-by-step tasks

Five tasks in priority order. Cleaning first — everything else is secondary until the gutters are clear and flowing.

L1

Gutter cleaning

Twice a year: late spring (after tree pollination and flowering) and late fall (after leaves have fallen). More often with heavy canopy. The single highest-ROI maintenance task in this category.

Ladder safety: Set the base 1 foot out per 4 feet of height. Top extends 3 rungs above the eave. Never lean against the gutter. On soft ground: use ladder mitts or a stake at the base. Always maintain three points of contact on the ladder.

1Position the ladder at the end of the gutter farthest from the downspout. Wear work gloves. Have a bucket with a hook to hang on the gutter edge, or a tarp on the ground below for debris.

2Remove debris with a gutter scoop or gloved hands, working toward the downspout. Move the ladder frequently rather than overreaching — belt buckle inside the rails at all times. Deposit debris into the bucket.

3After clearing the debris, flush the gutter with a garden hose from the far end toward the downspout. Watch the water flow — does it move smoothly toward the downspout, or does it pool anywhere? Pooling indicates a low spot that needs re-sloping.

4Test the downspout: Run the hose into the top of the downspout at full pressure. Water should exit freely at the bottom within 5–10 seconds. If it backs up: the downspout is clogged. Try the hose at higher pressure, working from the bottom up. If that doesn't clear it: a plumber's drain snake run through the downspout from the top usually clears any blockage.

5After cleaning, note: Any sections that sagged (water pooled), any joints that leaked during flushing, any downspouts that discharged within 6 feet of the foundation. These are the follow-up items for the next steps below.

L1

Install downspout extenders

Five minutes and $5–$15 per downspout. The single most impactful drainage improvement available to most houses. Every downspout should discharge at least 6 feet from the foundation — more is better.

1Find every downspout on the house. Note where the bottom of each one terminates — the bottom elbow that redirects water toward the ground. Most terminate 6–12 inches above grade.

2Choose the extender type: Rigid plastic extenders are simple and durable — a straight or angled section that attaches to the elbow. Flexible corrugated tubes allow routing around obstacles and can be buried (if perforated tubing is NOT used). Roll-out extenders flatten when dry and unroll with water pressure — useful where a rigid extender would be a trip hazard.

3Attach the extender to the downspout elbow — usually a friction fit, sometimes with a sheet metal screw to secure. The extender must slope away from the house — no uphill sections that trap water.

4The discharge point should be on a splash block or hard surface — a flat stone, concrete pad, or splash block that directs the water away from the foundation and prevents soil erosion at the outlet. Position the splash block so it slopes away from the house.

5Test: run water down the downspout and follow it to the discharge point. Watch where it flows from there. The goal: water that exits the downspout continues moving away from the foundation, not pooling and soaking in near the house.

L1 L2 (hanger adjustment)

Slope check and joint sealing

Done after every cleaning. Leaking joints and wrong slope are the two most common gutter problems that cleaning doesn't fix.

Slope inspection

1After flushing clean gutters, watch for sections where water pools rather than moving to the downspout. A section with standing water after the hose is off is sagging.

2(L2) Re-slope by adjusting hangers: From the ladder, locate the hanger on the sagging section (a spike through the gutter into the fascia, or a clip hanger). Loosen or remove and reposition slightly higher. The correct slope is ¼" drop per 10 feet — barely perceptible. Test with water after adjustment.

Joint sealing

3During the flush, look for drips below any section joints or inside corners. These indicate failed joint sealant. Mark with chalk or tape for repair after the gutter dries.

4Allow the gutter to dry completely (24 hours in warm weather, longer in cool or humid conditions). Clean the joint interior — remove all old sealant, debris, and any surface rust. Dry, clean metal is essential for adhesion.

5Apply gutter sealant from inside the gutter — use a product specifically rated for gutter applications (silicone or polyurethane gutter sealant, not standard exterior caulk). Apply across the full joint width. Smooth. Allow to cure 24 hours before running water through.

L1 (check) L2 (correct)

Foundation grade check and correction

The layer of water management beneath the gutter system. Correct grade is passive and permanent — it works every time it rains without any maintenance.

1Walk the foundation perimeter after a rain. Watch which direction puddles run. Toward the house = negative grade. Away from the house = positive grade (correct). Mark any negative-grade areas with a stake.

2Check with a level: Lay a 4-foot level on the soil with one end against the foundation wall. If the bubble shows the soil is higher at the house end: negative grade. The soil should be 6 inches lower at 6 feet from the house than at the house wall.

3(L2) Re-grade: Add topsoil in bags or from a bulk delivery. Build the soil level up against the foundation, starting from the wall and sloping down 1 inch per foot for the first 6 feet. Add in layers and tamp each layer with a hand tamper to prevent settling.

4Clearance requirements: Keep soil at least 6 inches below any wood siding, wood framing, or wood trim — wood-to-soil contact causes rot. Keep soil below any brick weep holes (the small gaps in brick mortar courses above the foundation that allow moisture to escape from the wall cavity). Add the topsoil against the foundation below these elements.

5After the next rain: re-check. New topsoil settles 10–20% in the first year. A follow-up top-dress of additional soil the following spring maintains the correct slope as the initial soil settles.

L1

Ice dam management (cold climates)

Short-term: create drainage channels through existing dams. Long-term: clean gutters in late fall and address attic insulation (the heat source that creates the melting). Ice dam prevention is Weatherization work; management is here.

1Identify an active ice dam: A ridge of ice at the eave line, with snow on the upper roof and water trapped between the snow and the ice ridge. Icicles are common but are not themselves the problem — the pool of water behind the dam is.

2Short-term: calcium chloride drainage channel. Fill the leg of a nylon stocking or mesh bag with calcium chloride pellets (not rock salt — rock salt damages vegetation and concrete). Lay it vertically across the ice dam, running from the dam down to the eave. The calcium chloride melts a channel through the dam, allowing the trapped water to drain.

3Do NOT: Chip at ice dams with a hammer, ice pick, or chisel. This commonly damages shingles. Also do not use rock salt — it damages roofing materials, gutters, vegetation below, and concrete walkways.

4Long-term prevention — two steps: (1) Clean gutters in late fall so meltwater can flow freely. (2) Address the root cause: improve attic insulation and ventilation so less heat escapes through the roof deck. A cold roof surface doesn't melt snow unevenly. See Weatherization for the attic bypass sealing that addresses this.

Emergency and disruption application

Three scenarios where drainage maintenance determines outcome.

Before predicted heavy rain

A 3-inch rain event over a 2,000-square-foot roof delivers approximately 3,700 gallons of water. Clogged gutters route all of that overflowing at the foundation. Cleaning before a predicted heavy rain event takes 2 hours and prevents thousands of gallons from depositing at the house base in a single event. This is the time-sensitive version of the slow problem that chronic clogging causes.

Water in the basement after heavy rain

Trace the water entry path before assuming it's a foundation problem. Water entering along the wall at the top of the basement (near the floor joists) is usually surface water from negative grade or a failed downspout extension. Water entering at the wall midpoint or through the floor is hydrostatic pressure from a high water table or saturated soil — a different problem requiring a sump pump or interior drainage system.

Ice storm and weight damage

Heavy ice accumulation in clogged gutters is one of the most common causes of gutter failure — the combined weight of ice and wet debris pulls hangers loose and detaches gutters from the fascia. Clean gutters in late fall before the first freeze precisely to prevent this. A gutter that's been pulled partially loose needs to be resecured before the next rain event routes water behind the fascia and into the wall.

Mandatory section

When to call a professional.

Gutter cleaning, extensions, and foundation re-grading are well within homeowner territory. Several drainage situations require professional expertise or specialized equipment.

Full gutter replacement

Seamless aluminum gutters — the residential standard — are fabricated on-site from a roll of aluminum using a machine on the installer's truck. This equipment produces gutters with no joints along the run (only at corners and downspout connections), dramatically reducing leak potential. This is gutter contractor work; homeowners can replace sections but not fabricate seamless runs.

French drains and underground drainage

A French drain (a trench filled with gravel and perforated pipe) is an effective solution for chronic surface water problems that surface re-grading doesn't solve. It requires correct design for slope, pipe sizing, and discharge location — and sufficient distance from the foundation and any utility lines. This is landscape contractor or drainage contractor territory.

Sump pump installation or replacement

If basement water intrusion is from hydrostatic pressure (water coming through the floor or low wall) rather than surface water, a sump pump and interior drainage system is the solution. Installation requires concrete cutting, electrical work for the pump, and a proper discharge location. A plumber or basement waterproofing contractor handles this.

Foundation waterproofing assessment

If water is entering through the foundation wall itself — not just running in from surface water — the foundation may have cracks or the original waterproofing membrane has failed. Before investing in any interior drainage system, get an exterior assessment. Fixing the source (exterior waterproofing) is always preferable to managing the consequence (interior drainage).

Practice project

The fall gutter pass — before the first freeze.

Time: 2–3 hours. Cost: $5–$20 in supplies. Outcome: clean gutters, functional downspouts, downspout extensions installed, foundation grade noted.

1.

Clean all gutters and flush. Note any sections that pool, any joints that leak during flushing, and the current state of every downspout exit point.

2.

Install downspout extenders on any downspout that discharges within 6 feet of the foundation. Buy one per downspout at the hardware store before starting — they cost $5–$15 each.

3.

Walk the foundation perimeter with a level. Identify any negative-grade areas. Add to the maintenance binder for spring re-grading if correction is needed.

4.

Record everything in the home maintenance binder: cleaning date, condition notes, what was installed or repaired, and what needs follow-up. Schedule the spring cleaning — typically April or May after tree pollination.

If you find leaking joints: Let the cleaned gutter dry for 24 hours (or do this on a second day). Apply gutter sealant from inside. This is the highest-priority follow-up from cleaning — a leaking joint deposits water at a specific location along the fascia and foundation repeatedly, and the damage accumulates faster than diffuse overflow.

Recommended resources

Books, resources, and the credential.

Books

The Complete Photo Guide to Home Repair (Black & Decker) — solid section on gutter repair and maintenance, with photo sequences for hanger adjustment and joint sealing.

Home Repair and Improvement (Time-Life Books) — the landscaping and drainage chapters cover foundation grade correction and surface drainage clearly.

Free resources

YouTube — This Old House gutter series: Gutter cleaning technique, slope adjustment, and joint sealing all have good video coverage here with clear technique.

Cooperative extension offices in your state often publish regional guides to foundation drainage and grading with soil-type-specific guidance. Find your state extension via your state's Learning page.

The credential

No credential is required for homeowner gutter cleaning, maintenance, and basic drainage. Landscaping contractor licensing (varies by state) covers commercial grading and drainage work. Plumbing contractor licensing covers sump pump installation. Foundation waterproofing is a specialty contractor category.