Half of the 881 homes in Hemlock were built before 1991. The rules below decide how much of the old roof has to come off and what goes under the new one.
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
Pennsylvania’s code leaves residential alterations without structural change to local ordinance (34 Pa. Code § 403.1(b)(8)). Whether Hemlock 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). 42% of Hemlock’s homes were built before 1980, so count the layers before comparing quotes.
Ice barrier
The code requires an ice barrier where the local climate table (Table R301.2) says so, and each Pennsylvania municipality fills that table in. Ask the township code office or the contractor what Hemlock’s says.
Checked against the code text on October 24, 2026. Everything else the state requires: roof replacement in Pennsylvania.
Owners live in 735 of Hemlock’s occupied homes, or 86%. Counting by decade, 22% before 1940, 26% before 1960, 42% before 1980 of the housing was in place, and 29% dates from 2000 on. (ACS 2020–2024.)
The housing is 91% detached houses, 5% attached single-family houses (rowhouses, twins and townhouses), 4% manufactured homes.
Of the 22 Columbia County municipalities on this site, Hemlock has the smallest share of homes built before 1980: 42%, against a county range of 42% to 93%.
| Place | Median built | Before 1980 | Owners | Row, twin | Hail days |
|---|---|---|---|---|---|
| Hemlock | 1991 | 42% | 86% | 5% | 4 |
| Montour | 1971 | 70% | 88% | 1% | 5 |
| Bloomsburg | 1966 | 73% | 35% | 14% | 4 |
| Mount Pleasant Township, Columbia County | 1978 | 57% | 83% | 1% | 6 |
| Cooper | 1979 | 52% | 90% | 1% | 5 |
| Scott Township, Columbia County | 1972 | 60% | 75% | 2% | 4 |
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.
Within 10 miles of Hemlock, hail of an inch or more was reported on 4 days between 2006 and 2025, the biggest stones 2.5 in on May 22, 2014.
That is fewer than most places in the state on this site (median 12 days).
At the county level, Hemlock shares Columbia County’s record of 2 storm disaster declarations since 2006, the newest 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.
Useful life is HUD’s planning figure, not a warranty. 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; 91% 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; 22% here predate 1940 | Sound slate can be reused (R908.5); broken slate cannot |
| Flat roof: EPDM or TPO | 15 years | Additions and porch roofs | Where the roof meets a wall or parapet |
A contractor who does $5,000 or more of home improvement work a year must be registered with the Pennsylvania Attorney General, and the number has to be on every contract and estimate (HICPA § 3, § 6). Ask for it before anyone starts on a roof in Hemlock, and search it.
Contracts, deposits and the right to cancel: checking a roofing contractor. What moves the price: new roof cost in Pennsylvania.
Hemlock’s ordinance decides. Pennsylvania’s code leaves residential alterations without structural change to local ordinance (34 Pa. Code § 403.1(b)(8)). Whether Hemlock 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). 42% of Hemlock’s homes were built before 1980, so count the layers before comparing quotes.
By the Census Bureau’s American Community Survey (2020–2024), the median home in Hemlock was built in 1991, 42% of homes were built before 1980, 86% are owner-occupied.
Hail of 1 inch or larger was reported on 4 days within 10 miles of Hemlock from 2006 through 2025 (NOAA Storm Prediction Center). A report means hail fell nearby, not that a roof was damaged.
A contractor who does $5,000 or more of home improvement work a year must be registered with the Pennsylvania Attorney General, and the number has to be on every contract and estimate (HICPA § 3, § 6). Ask for it before anyone starts on a roof in Hemlock, and search it.
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.