Half of the 514 homes in Derry Township were built before 1976. Below: what the code asks of a replacement here, the permit, and the town’s own records.
New Roofing Costs connects homeowners with independent local roofing contractors. We do not perform roofing work.
This number connects homeowners who are planning a new roof or a full roof replacement with independent local roofing contractors. It is not for leak repairs or patch jobs. The call must come from the homeowner who decides on the roof. Calls may be recorded.
Permit
Under 34 Pa. Code § 403.1(b)(8), alterations to a house that make no structural change are outside the state code. Whether Derry Township wants a permit is in its own ordinance; ask the township code office before the old roof comes off.
Source: 34 Pa. Code § 403.1(b)
Layers
A new roof may go over one existing layer; with two or more, or over slate, clay or cement tile, everything comes off to the deck (IRC R908.3.1.1). 61% of Derry Township’s homes were built before 1980; many have been reroofed before.
Ice barrier
Whether an eave membrane is a code item depends on the climate table the municipality filled in when it adopted the code (IRC R905.1.2, Table R301.2). Ask the township code office or the contractor what Derry Township’s says.
Checked against the code text on October 24, 2026. Code edition, permit and contract rules for the whole state: roof replacement in Pennsylvania.
Of 514 occupied homes in Derry Township, 425 (83%) are owner-occupied. Counting by decade, 24% before 1940, 32% before 1960, 61% before 1980 of the housing was in place, and 8% dates from 2000 on. (ACS 2020–2024.)
The housing is 61% detached houses, 4% attached single-family houses (rowhouses, twins and townhouses), 32% manufactured homes.
32% of homes in Derry Township are manufactured homes (165). A roof on a manufactured home is its own kind of job; tell the person on the line that it is one.
Of the 8 Montour County municipalities on this site, Derry Township has the 2nd largest share of homes built before 1980: 61%, against a county range of 36% to 72%.
ZIP codes: 17884
| Place | Median built | Before 1980 | Owners | Row, twin | Hail days |
|---|---|---|---|---|---|
| Derry Township, Montour County | 1976 | 61% | 83% | 4% | 4 |
| Valley Township, Montour County | 1984 | 43% | 91% | 1% | 4 |
| Madison Township, Columbia County | 1979 | 52% | 86% | 2% | 5 |
| Limestone Township, Montour County | 1985 | 43% | 77% | 1% | 10 |
| Anthony | 1977 | 55% | 90% | 1% | 8 |
| Liberty Township, Montour County | 1991 | 36% | 87% | 1% | 8 |
Median built: median year the homes were built. Before 1980: share of homes built then. Owners: share of homes that are owner-occupied. Row, twin: share of homes that are rowhouses, twins or townhouses. Census ACS 2020–2024. Hail days: days with hail of 1 inch or larger within 10 miles, 2006–2025, NOAA Storm Prediction Center.
NOAA’s storm reports show 4 days since 2006 with hail of at least 1 inch inside a 10-mile circle around Derry Township, topping out at 2.5 in on May 22, 2014.
That is fewer than most places in the state on this site (median 12 days).
Montour County has had 2 federal major-disaster declarations for storms since 2006; the latest was DR-4408, Severe Storms and Flooding (November 2018). (OpenFEMA.)
Storm reports are what observers logged, not a measure of damage to any roof. When wind or hail damage means a new roof.
Lifespans come from HUD’s capital-needs table, not from a brochure. More in the guides to shingles, metal, slate and flat roofs.
| Material | HUD useful life | Fits a house like | Watch for |
|---|---|---|---|
| Asphalt shingles | 20 years | Most pitched roofs; 61% of homes here are detached | Wind class set by the design wind speed (IRC Table R905.2.4.1) |
| Metal (standing seam, panels) | 50 years | Simple roofs with long, unbroken slopes | A complete standing-seam system may go over the old roof (R908.3.1) |
| Slate | 75 years | Older houses; 24% here predate 1940 | Never a base for a new layer (R908.3.1.1); heavy |
| Flat roof: EPDM or TPO | 15 years | Additions and porch roofs | Coating is not a replacement |
Before signing for a roof in Derry Township, get the contractor’s PA registration number: the home improvement law requires registration with the Attorney General above $5,000 a year of such work, and the number on contracts and estimates (HICPA § 3, § 6).
Contracts, deposits and the right to cancel: checking a roofing contractor. What moves the price: new roof cost in Pennsylvania.
Local ordinance, not the state. Under 34 Pa. Code § 403.1(b)(8), alterations to a house that make no structural change are outside the state code. Whether Derry Township wants a permit is in its own ordinance; ask the township code office before the old roof comes off.
A new roof may go over one existing layer; with two or more, or over slate, clay or cement tile, everything comes off to the deck (IRC R908.3.1.1). 61% of Derry Township’s homes were built before 1980; many have been reroofed before.
By the Census Bureau’s American Community Survey (2020–2024), the median home in Derry Township was built in 1976, 61% of homes were built before 1980, 83% are owner-occupied.
Hail of 1 inch or larger was reported on 4 days within 10 miles of Derry Township from 2006 through 2025 (NOAA Storm Prediction Center). A report means hail fell nearby, not that a roof was damaged.
Before signing for a roof in Derry Township, get the contractor’s PA registration number: the home improvement law requires registration with the Attorney General above $5,000 a year of such work, and the number on contracts and estimates (HICPA § 3, § 6).
The full list: before you call.
Checked October 24, 2026. Laws and code editions change; the date says when these were last read at the source.