Do you actually need gutters in Arizona?

Why it feels like a silly question

Arizona and gutters don’t usually go in the same sentence. Drive through almost any Valley neighbourhood built in the last thirty years and you’ll see street after street without a downspout in sight. Builders leave them off, neighbours don’t have them, and for a long stretch of the year nothing looks wrong at all.

So the assumption forms on its own: we don’t get enough rain for that.

The trouble is that the assumption is built on the wrong number.

Rainfall total is the wrong number. Intensity is the right one.

Phoenix gets somewhere around eight inches of rain in a typical year. Compared with almost anywhere east of here, that is nothing.

But that eight inches does not arrive politely spread across twelve months. The bulk of it lands during monsoon season — officially June 15 through September 30 — in short, intense convective storms. A single cell can sit over a few blocks and unload for twenty minutes at a rate that briefly rivals far wetter parts of the country.

With no gutters, every one of those storms sends the entire surface area of your roof off the edge in a curtain and onto the same narrow strip of ground. Same strip, every storm, year after year.

What that repetition actually does

Nobody calls us after one storm. They call after several summers of the same storm, when the results finally surface. In rough order of how often we see it:

• Fascia rot. Water sheeting off the edge runs back along the underside of the roof edge and sits against the wood. By the time the paint is bubbling, the board underneath is usually gone. This is the most common and most expensive thing we are called to deal with.
• Landscaping washout. Rock, mulch and soil migrate to the driveway on every storm, taking new plantings with them.
• Pavers and walkways sinking. The erosion happens underneath where you cannot see it. The surface looks fine right up until it dips.
• Foundation-adjacent pooling. Water repeatedly concentrated at one point along the wall instead of dispersed around the house.
• Interior water. The worst outcomes we have been called to involve roofline overflow that eventually found a path inside.

How to check your own house in five minutes

Go outside after the next storm, or just look for the evidence left by the last one.

• Trenches, channels or scoured lines in the rock or soil directly under the roof edge
• Splash staining on the lower stucco, usually a consistent band at the same height
• Landscape material regularly ending up on the driveway or walkway
• Pavers, walkway sections or patio edges that have started to settle unevenly
• Fascia board that looks dark, soft, swollen or is losing paint along the roof edge
• A drip line worn into the ground that traces the shape of your roof

If you find two or more, water is concentrating rather than dispersing, and it will keep doing it.

When we tell people they don’t need gutters

This happens, and we would rather say it on the estimate than sell around it. A home with deep roof overhangs, grading that genuinely carries water away from the structure, hardscape rather than planting beds at the drip line, and no history of fascia trouble may be perfectly fine without gutters.

There are also partial answers. Plenty of Valley homes only need gutters on one or two elevations — the sides where the roof sheds toward an entry, a patio, a walkway or a planting bed — rather than the whole perimeter. That is a much smaller job, and it is often the right one.

If you do need them, what matters here

Arizona conditions push the specification in a particular direction: aluminium rather than vinyl, because vinyl degrades noticeably faster under this much UV and heat; seamless runs formed to your actual roofline rather than sectional lengths joined together; and real thought given to where the water goes after it leaves the downspout, which is the part most installers skip.

We form gutters on site with our own roll-forming machine, cut and strip-miter every corner by hand, and handle the drainage side as well — drain lines, French drains, scuppers and rain tanks. Details are on the gutter installation and drainage pages.