Valley and Flashing Repair on Cicero Roofs
A valley carries the water off two roof planes at once, and it was built before either of them, which is why patching one never lasts.
Flashing Repair quote in Cicero
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Why a leaking valley cannot be fixed from the surface
The order of assembly is what decides this job. Section R905.2.8.2 requires a valley lining to be installed before the shingles go on and sets minimum widths by type: metal not less than 24 inches wide in an open valley, or two plies of mineral-surfaced roll roofing with an 18 inch bottom layer under a top layer of at least 36 inches, or in a closed valley one ply of smooth roll roofing at least 36 inches wide, with a self-adhering polymer-modified bitumen underlayment allowed instead. Cicero is 80.8 percent single-family detached, one of the highest shares in the metro, across 13,584 homes, and detached houses of the last few decades carry a lot of hips, gables and garage returns. Every one of those junctions is a valley somebody lined once.
What flashing repair involves
Judging a valley quote before you accept it
The test of a valley quote is whether it describes opening the roof. Because the lining sits under the covering on both sides, a new lining means lifting the shingles either side of it and weaving them back, and anybody promising to cure a leaking valley without disturbing the covering is describing a coating. Coatings buy a season or two. The second thing worth asking is what the existing lining is, since a closed valley with shingles woven across it and an open valley with exposed metal fail differently and need different work. Neither answer requires a whole roof, and on a Cicero house of this generation the covering around the valley is usually still doing its job.
Expect the covering to be opened
A lining goes in before the shingles, so it comes out the same way. A quote that avoids saying this is quoting a surface treatment.
Ask which valley type you have
Open with exposed metal, or closed with shingles woven across it. They fail differently and the repair differs with them.
Keep the job to the valley
On stock of this age the field of the roof either side is usually sound. There is no reason for a valley repair to become a covering price.
What the code requires under a Cicero valley
The Town of Cicero has 13,584 housing units of which 80.8 percent are single-family detached, one of the highest detached shares in the metro, with 80.6 percent owner occupancy and a median build year of 1980. 50.4 percent of the town's housing was built in 1980 or later.
Source: US Census Bureau, American Community Survey 2020-2024 5-year estimates, tables B25034 year structure built, B25035 median year structure built, B25024 units in structure and B25003 tenure, accessed 2026-09-14
Section R905.2.8.2 of the 2025 Residential Code of New York State requires valley linings to be installed before the shingles go on, and sets minimum widths by valley type: open valleys lined with metal not less than 24 inches wide, open valleys of two plies of mineral-surfaced roll roofing with an 18 inch bottom layer and a top layer not less than 36 inches, and closed valleys lined with one ply of smooth roll roofing not less than 36 inches wide, or a self-adhering polymer-modified bitumen underlayment in place of the lining.
Source: 2025 Residential Code of New York State, via UpCodes, accessed 2026-09-14
In the Town of Cicero the median year of construction is 1980. Of 13,584 housing units, 6.9 percent were built in 1939 or earlier, 10.6 percent before 1950, 49.6 percent before 1980 and 50.4 percent in 1980 or later. 80.8 percent are single-family detached and 80.6 percent of occupied units are owner occupied.
Source: US Census Bureau, American Community Survey 2020-2024 5-year estimates, tables B25034 year structure built, B25035 median year structure built, B25024 units in structure and B25003 tenure, accessed 2026-09-14
Point us at the valley that leaks
Which side of the house, and what the ceiling below it is doing. We arrange an insured contractor who relines rather than coats.
Other roof work in the Town of Cicero
Valley and joint questions from Cicero
The valley has been tarred twice and still leaks. What now?
That history is itself the diagnosis. Roof cement over a valley is a surface treatment on a detail that fails underneath, so it holds until the next freeze and then reopens. The work that lasts is stripping back the courses either side, putting in a lining of the width the code sets, and reweaving the shingles over it.
Does a valley leak mean the whole roof is finished?
Very rarely on housing of this age. A valley concentrates the water off two planes into one channel, so it is the hardest working part of the roof and it fails first while the field around it is still sound. Pricing a covering off a valley leak is exactly the sequence this site exists to interrupt.
Get the valley rebuilt properly
Send the Cicero address and a photo of the roof junction. No obligation, and this is a repair rather than a roof.