Lynn has 1,809 homes, and half of them were standing by 1980. What the code requires when that roof is replaced, and who signs off, is below.
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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
Pennsylvania’s code leaves residential alterations without structural change to local ordinance (34 Pa. Code § 403.1(b)(8)). So the township code office in Lynn is the one to ask before work starts.
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 Lynn’s homes were built before 1980, ask what is under the newest layer.
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 Lynn’s says.
Checked against the code text on October 24, 2026. The state’s code edition and the rest of its rules: roof replacement in Pennsylvania.
Of 1,705 occupied homes in Lynn, 1,409 (83%) are owner-occupied. Counting by decade, 32% before 1940, 39% before 1960, 50% before 1980 of the housing was in place, and 23% dates from 2000 on. (ACS 2020–2024.)
The housing is 77% detached houses, 8% attached single-family houses (rowhouses, twins and townhouses), 8% manufactured homes.
Older houses hide their history: ask the contractor to confirm the deck (board or sheet) and every layer above it before pricing, because slate or two layers mean a full tear-off.
Of the 25 Lehigh County municipalities on this site, Lynn has the 18th largest share of homes built before 1980: 50%, against a county range of 22% to 90%.
ZIP codes: 18066 · 19529
| Place | Median built | Before 1980 | Owners | Row, twin | Hail days |
|---|---|---|---|---|---|
| Lynn | 1980 | 50% | 83% | 8% | 5 |
| Heidelberg Township, Lehigh County | 1977 | 57% | 90% | 9% | 13 |
| Weisenberg | 1991 | 31% | 92% | 1% | 13 |
| Lowhill | 1980 | 50% | 86% | 3% | 16 |
| West Penn | 1981 | 49% | 86% | 1% | 8 |
| Albany | 1950 | 68% | 82% | 1% | 2 |
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.
Since 2006 the National Weather Service has logged hail of 1 inch or larger on 5 separate days within 10 miles of Lynn; the largest was 2.5 in on May 14, 2010. The most recent was September 7, 2023.
That is fewer than most places in the state on this site (median 12 days).
Lehigh County has had 2 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 Lynn’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; 77% 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 | Roofs that will carry solar later | A complete standing-seam system may go over the old roof (R908.3.1) |
| Slate | 75 years | Older houses; 32% here predate 1940 | Can’t be roofed over; check the framing for the weight |
| Flat roof: EPDM or TPO | 15 years | Additions and porch roofs | Coating is not a replacement |
Before signing for a roof in Lynn, 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.
Lynn’s ordinance decides. Pennsylvania’s code leaves residential alterations without structural change to local ordinance (34 Pa. Code § 403.1(b)(8)). So the township code office in Lynn is the one to ask before work starts.
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 Lynn’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 Lynn was built in 1980, 50% of homes were built before 1980, 83% are owner-occupied.
Hail of 1 inch or larger was reported on 5 days within 10 miles of Lynn 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 Lynn, 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.