Bird stops on tile roofs: why pigeons move in under your eaves

The gap at the bottom of every curved tile

Stand in the street and follow the bottom edge of your roof. On S-tile and barrel tile, every high point of the profile leaves an arched opening between the tile and the roof below it. Along a typical eave that adds up to dozens of fist-sized pockets, each one shaded, dry and several inches deep. Flat concrete tile leaves a thinner slot, but it still leaves one.

A bird stop closes those openings. It is usually a strip of formed metal or dense foam cut to the same wave as the tile, fastened at the eave so the first course rests on it or against it. Good versions keep small weep openings at the bottom, so any water that gets under the tile can still drain out. On some clay and barrel roofs the same job is done with mortar packed into each opening, often called a mortared or boosted eave.

Why pigeons pick that exact spot

Feral pigeons nest on ledges with cover overhead, and a tile eave is a ready-made row of them. Each pocket faces outward, so adults can fly straight in. The tile above blocks the sun, the fascia below blocks the wind, and hawks have no easy angle of attack. Pools, misters, drip lines and pet bowls keep water close by in most Valley neighborhoods.

Sparrows, starlings and finches use the same gaps, and so do roof rats and the odd bee swarm. Pigeons also come back to the same nest year after year and raise several broods in a season, so a colony tends to grow right where it started. One open eave over a two-story garage can hold a handful of nests by the end of spring.

What a nest does to the roof you can't see

The tile isn't the waterproof layer on a Phoenix tile roof. The underlayment beneath it is, and the eave is where all the water from above finally drains off. A nest built in that last pocket sits on top of the underlayment, in the one place every drop running down that course has to pass. Twigs, feathers and droppings form a dam. In a monsoon downpour, water backs up behind it and finds the laps and nail holes in the felt.

Droppings make it worse. They are acidic, stay damp longer than the tile around them and break down organic felt over time. Birds also tug at loose underlayment edges for nesting material. On a roof where the felt is 20 years old and brittle from heat, the eave is often the first place it fails, and the damage shows up as rot in the fascia board, stains on the soffit or a damp patch on the ceiling near an outside wall. When we find that, the fix may grow into new underlayment along the eave rather than a closure alone.

How eaves end up open in the first place

Some roofs never had bird stops. Others had them and lost them over the years. These are the patterns we run into most often across the Valley:

If birds are already living under your solar panels, the eaves are often their next stop once the array is screened off. Our post on birds nesting beneath a solar array covers that side of things, and the eave is really the same fight on a different edge of the roof.

• Older roofs laid before eave closures were common practice
• Foam closure strips that dried out, crumbled and fell away
• Mortared eaves that cracked and dropped chunks into the gutter
• Bird stops left off during a repair, reroof or solar install
• Metal strips bent by a ladder, a gutter cleaning or haboob wind

Metal, foam or mortar: choosing the closure

Formed metal bird stop is our usual pick on concrete S-tile and flat tile. It holds its shape in heat, doesn't rot or crumble, and can be finished in a color close to the tile so it nearly disappears from the street. It is fastened along the eave, and the first course of tile sits on it at the correct height, which also keeps that bottom row from tipping down over time.

Foam closures cost less and fit tight profiles well, but the cheaper kinds harden and shrink in Valley sun and need replacing sooner. Mortared eaves suit some clay barrel roofs and Spanish-style homes where that look is part of the design or an HOA rule. Whatever the material, it needs weep openings at the bottom and must not block the airflow some roofs rely on at the eave for attic ventilation.

Adding bird stops to a roof that already has tile

Retrofitting is routine work. We clear birds and nests first, checking that no active nests of protected native species are involved, since those have to wait until the young have flown. Then the first course or two of tile along the eave is lifted, the nest debris is bagged and hauled off, and the underlayment and drip edge get a close look while they are exposed.

Damaged felt is patched or replaced, the new closure is fastened, and the tile goes back in its original order, with any broken pieces swapped for matching tile. On a typical single-story home this is a one-day visit. Our bird stop and eave closure service covers the cleanout, the underlayment check and the closure together, so the eave is done once.

What it costs and when to schedule it

Adding bird stops to an existing tile roof around Phoenix usually runs about $9.40 to $16.80 per linear foot of eave in 2026, or roughly $1,165 to $3,290 for a typical home. Two-story eaves, heavy nest buildup, damaged underlayment, broken tile and mortared closures push the number higher. Short runs over a patio or garage can often be handled on their own.

Late fall and winter are the easiest times, when nesting slows and the roof is comfortable to work on. Closing the eaves before spring keeps birds from settling in at all. If the fascia behind old nests has gone soft, it belongs in the same visit. Call (602) 878-3594 at any hour and we'll walk the eaves with you.

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