Can you pressure wash gutters? Mostly no, and here is what goes wrong

The short answer, split in two

The question gets asked as one question and it is really two, because a gutter has an inside and an outside and they want opposite things.

Inside the trough: no. Clearing debris is hand work, followed by a flush to prove the line runs. A pressure washer aimed into a gutter full of wet pine straw pushes the mass along the trough and into the downspout opening, where it compacts. You have not removed the clog, you have relocated and tightened it, and now you cannot reach it.

Outside the trough: yes, and it needs doing. The faces of gutters develop a dark vertical striping that a house wash does not remove on its own. That is a low-pressure job with a dedicated product, and it is the half of gutter cleaning almost nobody asks for.

What actually goes wrong inside

• Denting. Residential gutters are thin aluminum. A concentrated stream at close range dents the trough and the dent holds standing water permanently after that.
• Water behind the fascia. The back edge of a gutter sits against the fascia board and under the drip edge. Pressure pointed at that seam drives water into the board and into the roof deck behind it, which is rot you will not see for two years.
• Loosened hangers. Gutters hang on spikes or hidden hangers with limited holding power. Sustained force at the lip works them loose, and a sagging run holds water at the low point.
• Compacted downspouts. Covered above, and it is the most common outcome.
• Shingle damage at the eave. The wand is inches from the bottom course of shingles, which is the most vulnerable part of the roof. Shingles never take pressure at any point on the roof, and the eave is where people forget that.
• Everything on the ground. A gutter full of decomposed organic matter, sprayed at pressure, goes onto the siding, the windows, the beds, and whoever is holding the ladder.

When water inside a gutter is the right tool

After the debris is out, not instead of taking it out.

The pine straw problem

Standard gutter advice assumes broad deciduous leaves that arrive over about three weeks in the fall. Pine does not behave that way. Needles shed year round with a heavy drop in late spring, they are small enough to pass a gutter guard, and wet they knit into a dense mat that behaves like felt rather than like loose debris.

Pressure does almost nothing to a pine mat except move it as a unit. That is the single most common reason somebody tries a pressure washer on a gutter in the Triangle and Johnston County, decides it worked because the trough looks clear, and then finds the downspout blocked solid in the first real storm. How often gutters need doing here goes into what pine does to the schedule.

What about gutter guards

They reduce the volume and they do not eliminate the job. Fine debris, shingle grit, and pine needles all get through or build up on top, and the guards themselves have to come off and go back on to clear what is underneath. A guarded gutter usually needs attention less often and takes longer per visit.

Do not pressure wash a guarded gutter. The force lifts and deforms the guards, and then they no longer sit flat, which defeats the only thing they were doing.

What we do

Gutter cleaning here is hand clearing, a flush to prove the run, downspouts checked from the bottom, and the exterior faces washed at low pressure while we are on the property. If a run is sagging or a hanger has pulled, we tell you, because clearing a gutter that holds water is solving half the problem.

If you want to see the condition before deciding anything, our free drone inspection shows you the gutter line and the roof on a screen without anybody going up a ladder. Call (919) 698-3669.