Mount Joy Township has 1,556 homes, and half of them were standing by 1980. What the code requires when that roof is replaced, and who signs off, is below.
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 Mount Joy 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
On a roof that already carries two layers, or slate or tile, the code allows no recover: it is a tear-off (IRC R908.3.1.1). With 50% of Mount Joy Township’s homes were built before 1980, ask what is under the newest layer.
Ice barrier
IRC R905.1.2 calls for an ice barrier where Table R301.2 says so; in Pennsylvania the municipality completes that table. The contractor or the township code office in Mount Joy Township will know.
Checked against the code text on October 24, 2026. Everything else the state requires: roof replacement in Pennsylvania.
86% of the occupied homes in Mount Joy Township are lived in by their owners: 1,231 households, the people this line is for. Counting by decade, 12% before 1940, 19% before 1960, 50% before 1980 of the housing was in place, and 24% dates from 2000 on. (ACS 2020–2024.)
The housing is 94% detached houses, 3% attached single-family houses (rowhouses, twins and townhouses).
Of the 28 Adams County municipalities on this site, Mount Joy Township has the 11th largest share of homes built before 1980: 50%, against a county range of 26% to 87%.
ZIP codes: 17340
| Place | Median built | Before 1980 | Owners | Row, twin | Hail days |
|---|---|---|---|---|---|
| Mount Joy Township, Adams County | 1980 | 50% | 86% | 3% | 10 |
| Bonneauville | 1982 | 48% | 63% | 22% | 16 |
| Germany | 1983 | 47% | 94% | 3% | 17 |
| Cumberland | 1983 | 46% | 77% | 15% | 7 |
| Littlestown | 1966 | 54% | 72% | 19% | 19 |
| Gettysburg | 1942 | 87% | 47% | 17% | 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 10 days since 2006 with hail of at least 1 inch inside a 10-mile circle around Mount Joy Township, topping out at 1.25 in on July 12, 2022. The most recent was March 16, 2025.
Adams County has had 3 federal major-disaster declarations for storms since 2006; the latest was DR-4267, Severe Winter Storm and Snowstorm (March 2016). (OpenFEMA.)
Storm reports are what observers logged, not a measure of damage to any roof. When wind or hail damage means a new roof.
HUD’s useful-life figures are for planning; a warranty is a separate promise. For Mount Joy Township’s houses: 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; 94% 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; 12% 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 |
Pennsylvania’s home improvement law (HICPA § 3, § 6) requires registration with the Attorney General from $5,000 a year of such work and puts the number on every estimate; ask for it in Mount Joy Township and look it up.
Contracts, deposits and the right to cancel: checking a roofing contractor. What moves the price: new roof cost in Pennsylvania.
Ask Mount Joy Township first. Under 34 Pa. Code § 403.1(b)(8), alterations to a house that make no structural change are outside the state code. Whether Mount Joy Township wants a permit is in its own ordinance; ask the township code office before the old roof comes off.
On a roof that already carries two layers, or slate or tile, the code allows no recover: it is a tear-off (IRC R908.3.1.1). With 50% of Mount Joy Township’s homes were built before 1980, ask what is under the newest layer.
By the Census Bureau’s American Community Survey (2020–2024), the median home in Mount Joy Township was built in 1980, 50% of homes were built before 1980, 86% are owner-occupied.
Hail of 1 inch or larger was reported on 10 days within 10 miles of Mount Joy Township from 2006 through 2025 (NOAA Storm Prediction Center). A report means hail fell nearby, not that a roof was damaged.
Pennsylvania’s home improvement law (HICPA § 3, § 6) requires registration with the Attorney General from $5,000 a year of such work and puts the number on every estimate; ask for it in Mount Joy Township and look it up.
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.