The median home in Towamencin was built in 1980; there are 7,559 of them. 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
Under 34 Pa. Code § 403.1(b)(8), alterations to a house that make no structural change are outside the state code. Whether Towamencin 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
IRC R908.3.1.1 forbids roofing over two existing layers, over slate or tile, or over a water-soaked roof. 50% of Towamencin’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. Towamencin’s answer is with the township code office.
Checked against the code text on October 24, 2026. The state’s code edition and the rest of its rules: roof replacement in Pennsylvania.
Owners live in 4,877 of Towamencin’s occupied homes, or 66%. Counting by decade, 14% before 1960, 50% before 1980 of the housing was in place, and 12% dates from 2000 on. (ACS 2020–2024.)
The housing is 49% detached houses, 22% attached single-family houses (rowhouses, twins and townhouses), 5% buildings of two to four units.
Of the 61 Montgomery County municipalities on this site, Towamencin has the 41st largest share of homes built before 1980: 50%, against a county range of 17% to 98%.
ZIP codes: 19446
| Place | Median built | Before 1980 | Owners | Row, twin | Hail days |
|---|---|---|---|---|---|
| Towamencin | 1980 | 50% | 66% | 22% | 17 |
| Lansdale | 1958 | 81% | 55% | 34% | 14 |
| Hatfield Borough | 1972 | 67% | 48% | 25% | 13 |
| Lower Salford | 1986 | 37% | 73% | 17% | 17 |
| Worcester | 1993 | 27% | 85% | 27% | 18 |
| Upper Gwynedd | 1983 | 44% | 74% | 21% | 16 |
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 Towamencin, hail of an inch or more was reported on 17 days between 2006 and 2025, the biggest stones 1.75 in on August 26, 2006. The most recent was August 18, 2024.
That is more hail days than 79% of the places in the state on this site.
Montgomery County has had 6 federal major-disaster declarations for storms since 2006; the latest was DR-4618, Remnants of Hurricane Ida (September 2021). (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; 49% 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 and historic houses | Can’t be roofed over; check the framing for the weight |
| Flat roof: EPDM or TPO | 15 years | Low-slope roofs and rear sections (22% of homes here are attached) | Coating is not a replacement |
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 Towamencin, and search it.
Contracts, deposits and the right to cancel: checking a roofing contractor. What moves the price: new roof cost in Pennsylvania.
Ask Towamencin first. Under 34 Pa. Code § 403.1(b)(8), alterations to a house that make no structural change are outside the state code. Whether Towamencin wants a permit is in its own ordinance; ask the township code office before the old roof comes off.
IRC R908.3.1.1 forbids roofing over two existing layers, over slate or tile, or over a water-soaked roof. 50% of Towamencin’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 Towamencin was built in 1980, 50% of homes were built before 1980, 66% are owner-occupied.
Hail of 1 inch or larger was reported on 17 days within 10 miles of Towamencin 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 Towamencin, 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.