Most homeowners never see their gutters cleaned. The crew arrives, ladders go up, forty minutes pass, and someone says it is done. You are left taking it on trust, which is a strange way to buy anything.
So here is the whole thing, in the order we do it, including the parts that are easy to skip and the one step that actually proves the job worked. If you hire someone else, this doubles as the list to hold them to.
What the gutters are actually up against here
Two Houston-specific facts set the stakes, and both are worth having in mind before the first ladder goes up.
The first is the sheer intensity of the rain. NOAA’s Atlas 14 precipitation frequency data for downtown Houston puts a ten-year, one-hour rainfall at 3.22 inches, and a hundred-year hour at 4.85 inches (NOAA Atlas 14 Precipitation Frequency Data Server). The National Weather Service office here has recorded local rain rates upwards of 4 to 5 inches per hour in flash flood events, and notes that urbanisation increases runoff by 2 to 6 times over what natural terrain would produce (NOAA National Weather Service Houston/Galveston). A trough that is two thirds full of compacted leaf mulch is not failing against a drizzle.
The second is what happens to the water once it lands, because Houston sits on clay. The USDA’s soil mapping describes the Beaumont, League and Lake Charles series across this part of Texas as well-developed clayey soils with high shrink-swell properties (USDA Natural Resources Conservation Service). The Texas Department of Licensing and Regulation, in its technical bulletin on foundations for industrialized housing, is direct about the consequence: expansive soils, which shrink and swell due to changes in moisture content, are a very common cause of foundation problems, and the builder must ensure that water drains away from the house on all sides (Texas Department of Licensing and Regulation). The bulletin is written for modular construction, but the drainage physics do not care how the house was built.
That is the real reason gutters matter in this city. Dumping a few thousand gallons in a ring around the slab, season after season, is how the soil under one corner of a house ends up on a different moisture cycle from the soil under another.
Step one: setup and protecting what is underneath
Before anything comes out of a gutter, the ground gets covered. Debris that has sat wet in a trough for months is black, it stains, and it lands on whatever is below: the patio, the beds, the driveway, the pool coping.
Ladder setup gets the same attention, for reasons that are practical rather than ceremonial. OSHA’s ladder standard requires the side rails to extend at least 3 feet above the upper landing surface, and a non-self-supporting ladder to be set so the base sits roughly a quarter of the working length out from the wall (OSHA 29 CFR 1926.1053). Those rules govern employers rather than homeowners, but they are the standard a professional crew works to, and a crew that plants a ladder against the gutter lip itself is about to bend it.
Step two: the debris comes out by hand
This is the step that separates a real cleaning from a fast one, and it is worth understanding why.
A leaf blower moves dry leaves and does very little to the layer underneath, which on a Houston roof is a compacted sludge of decomposed leaf matter, shingle grit and seed pods sitting in the bottom of the trough. That layer is what actually restricts flow, and it is also what holds moisture against the metal and the fascia behind it.
Blowing also has a habit of driving loose debris straight into the downspout opening, which converts a gutter problem into a downspout problem you cannot see.
So the debris comes out by hand, into a bucket, working along the run. Slower, heavier, and the only way the trough ends up genuinely empty.
Step three: the downspouts, and how a clog gets found
Downspouts are where most of the real failures live, because they are the narrowest part of the system and the part nobody can inspect from the ground.
They clog in two places: the top elbow, where debris coming along the trough has to turn a corner and jams, and the bottom, where an underground drain line silts up or gets root-bound. Many Houston lots have a buried drain carrying water away from the slab, and many do not, so part of the job is establishing what you actually have.
Finding the blockage comes down to a few unglamorous checks. Tap down the length of the downspout and listen for the dull spot where the ring goes dead. Run water in the top and time how long it takes to appear at the bottom, or whether it appears at all. Then clear it from the appropriate end, which is usually from the bottom upward so the debris comes out rather than compacting further down.
The published sizing rules explain why downspouts choke so readily. The Department of Energy’s Building America guidance allows 1 square inch of downspout cross-section for every 100 square feet of roof area, and recommends downspouts every 20 to 50 feet along the gutter (US Department of Energy, Building America Solution Center). A standard 2 by 3 inch downspout is 6 square inches, so it is rated for roughly 600 square feet of roof. On a house where one downspout is quietly draining far more than that, a partial clog is enough to put water over the lip.
Step four: the flush and the flow test
This is the proof step, and it is the one most often skipped.
Water goes in at the far end of each run and we watch the whole system work. What we are looking for is where it goes, how fast it gets there, whether the trough holds standing water anywhere along the way, and whether anything weeps at a seam or an end cap under load.
Then we follow the water out. The Building America guidance is to discharge at least 5 feet from the foundation, or 10 feet where the water is piped underground. On a surprising number of houses the flush reveals a downspout emptying straight onto the soil at the base of the slab, or into a buried line that surfaces two feet away and backs up, and neither of those shows up on a dry day.
If a crew leaves without running water through the system, nobody has established that it works, which makes the flow test the one thing worth asking for by name.
Step five: what we are inspecting while we are up there
You are paying for eyes at height as much as for debris removal, so the inspection is part of the deliverable. What gets checked:
- Standing water in the trough after the flush. Gutters are meant to be pitched at least 1/16 inch per foot toward the downspout (Berger Building Products, reproducing SMACNA sizing tables). Over a thirty-foot run that is under two inches of total fall, which is why bad slope is invisible from the driveway and only shows as a puddle that never drains.
- Hanger spacing and condition. Hangers should sit at a maximum of 36 inches on centre. Sagging between them usually means a pulled fastener or rotten fascia behind it rather than a bent gutter.
- Seams, end caps and mitres, which are where sealant fails first.
- The fascia and soffit behind the gutter. This is the one that costs real money if it is missed. A Forest Products Laboratory paper sets out the conventional thresholds, noting it is well understood that wood will decay above 30 percent moisture content and will not decay below 20 percent, and then argues that 20 percent is a conservative floor (USDA Forest Service, Forest Products Laboratory). Those are laboratory conditions rather than something you can read off a specific board with a meter, but the principle holds: a gutter that has been overflowing down the same stretch of fascia keeps that wood wet for months at a time.
- Roof edge condition, including shingle grit loading in the trough, which tells you something about the age of the roof.
Findings get reported whether or not they are our work to fix. A separated seam is a ten-minute job; a soft fascia board is a carpenter.
Step six: cleanup and the walkthrough
Debris gets bagged and taken away rather than tipped in the flower bed. The gutter line and any splashed surfaces get rinsed. Fasteners and stray screws get picked up off the drive, which matters more than it sounds if you park on it.
Then a walkthrough: what came out, what we found, what needs watching, and anything that is now a separate quote. If the exterior walls picked up runoff staining below an overflowing section, that is usually a house washing conversation rather than a gutter one, and the driveway below a downspout is often ready for pressure washing at the same visit.
How often, and what actually drives it
Ignore the calendar rule you have read elsewhere, because most of it was written for a different climate.
The northern advice is to clean in autumn after the leaves drop, and Houston’s dominant shade tree refuses to work that way. Texas A&M’s plant clinic notes that live oaks drop their old leaves as new leaves emerge in the spring, and that this is normal rather than a disease (Texas A&M AgriLife, Texas Plant Disease Diagnostic Laboratory). A live oak canopy over your roof means a heavy spring load, not an autumn one. Pines add needles nearly year round, and pecans drop through autumn.
What actually drives frequency is the canopy over the roof, the species in it, the roof pitch, and whether guards are fitted. Guards reduce the load but do not remove the need to look. The Texas Water Development Board’s rainwater harvesting manual puts it in one line: leaf screens must be regularly cleaned to be effective (Texas Water Development Board).
The same manual gives the number that makes all of this concrete. In theory, roughly 0.62 gallons per square foot of collection surface can be collected per inch of rainfall. On a 2,000 square foot roof footprint, a three inch rain is somewhere near 3,700 gallons moving through the system in a few hours. That is what the trough is handling, and it is why a job that ends without a flow test is not finished.
Our gutter cleaning follows exactly the sequence above, including the flush, and you get the findings whether they are good news or not.
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References
- NOAA National Weather Service, Hydrometeorological Design Studies Center, Precipitation Frequency Data Server, NOAA Atlas 14 Volume 11 (Texas), https://hdsc.nws.noaa.gov/pfds/
- NOAA National Weather Service Houston/Galveston, Spring Weather Safety Campaign: Flash Floods, https://www.weather.gov/hgx/severe_weather_awareness_flashflood
- US Department of Energy, Pacific Northwest National Laboratory, Building America Solution Center, Gutters and Downspouts, https://basc.pnnl.gov/resource-guides/gutters-and-downspouts
- Texas Department of Licensing and Regulation, IHB TB 10-01: Foundations on Expansive Soils, https://www.tdlr.texas.gov/ihb/pdf/TB1001.pdf
- USDA Natural Resources Conservation Service, General Soil Map of Texas, https://www.nrcs.usda.gov/sites/default/files/2023-08/Texas%20General%20Soil%20Map.pdf
- USDA Forest Service, Forest Products Laboratory, Morris and Winandy, Limiting Conditions for Decay in Wood Systems, https://www.fpl.fs.usda.gov/documnts/pdf2002/morri02a.pdf
- Texas A&M AgriLife, Texas Plant Disease Diagnostic Laboratory, Live oak dropping leaves in early spring, https://plantclinic.tamu.edu/factsheets/live-oak/
- Texas Water Development Board, The Texas Manual on Rainwater Harvesting, 3rd Edition, https://www.twdb.texas.gov/publications/brochures/conservation/doc/RainwaterHarvestingManual_3rdedition.pdf
- Berger Building Products, Proper Gutter and Downspout Sizing (reproducing SMACNA Architectural Sheet Metal Manual tables), https://bergerbp.com/wp-content/uploads/2022/07/propergutterdownspoutsizing.pdf
- OSHA, 29 CFR 1926.1053, Ladders, https://www.ecfr.gov/current/title-29/subtitle-B/chapter-XVII/part-1926/subpart-X/section-1926.1053
