Adopted building code
The 2021 International Residential Code, as adopted by the State in the Pennsylvania Uniform Construction Code (UCC). 34 Pa. Code 403.21(a)(7) adopts "The 'International Residential Code of 2021,' except that:" followed by the State's list of exclusions and modifications, effective January 1, 2026 (55 Pa.B. 7701). None of the State's changes touches Chapter 9, Roof Assemblies, or Section R803, Roof Sheathing, so those apply as the International Code Council publishes them. Work on existing buildings is also pointed to the State's existing-building code: "The repair, alteration, change of occupancy, addition and relocation of existing buildings must comply with Chapter 34 of the 'International Building Code of 2021' or with the 'International Existing Building Code of 2021'" (34 Pa. Code 403.21(f)). The UCC is the minimum everywhere in the state: "no municipality may propose or enact any ordinance which is less than the minimum requirement of the Uniform Construction Code" (Pennsylvania Construction Code Act, Act 45 of 1999, section 503(b)). The Act also lists work it "shall not apply to", including "Alterations to residential buildings which do not make structural changes or changes to means of egress" or to "Repairs to residential buildings," in each case "except as might be required by ordinances" kept in force under section 303(b)(1) or adopted under section 503 (Act 45 section 104(b)(5) and (6); 34 Pa. Code 403.1(b)(8) and (9)). The Act defines a repair as "The reconstruction or renewal of any part of an existing building for the purpose of its maintenance." So whether the code's roofing rules reach a given house reroof depends on the municipality's own ordinances. Everything above is Pennsylvania state law, the same in every municipality. Locally, Antis Township takes residential building permit applications at the Antis Township Municipal Building, 909 North Second Street, Bellwood. Section 150.01 of the Township Code (Ord. 3-2004) says "The township hereby elects to administer and enforce the provisions of the State Construction Code Act," and the Township's Building Inspections and Codes Enforcement page says "the Antis Township Board of Supervisors voted to contract with Middle Department Inspection Agency (MDIA) and Pennsylvania Municipal Code Alliance (PMCA) to provide plan review and inspection services." Section 150.01(B) adopts the Uniform Construction Code in 34 Pa. Code Chapter 401 et seq., "as amended from time to time," "as the Municipal Building Code of the township," and Section 150.01(E)(1) keeps in force building code ordinances "adopted by the township on or before July 1, 1999, and which equal or exceed the requirements of the code." Section 150.16 (Ord. 4-1992) says "No building or structure, or any part thereof, shall be erected, enlarged, converted, repaired, altered, razed and/or demolished, until a building permit shall have been procured from the township," in a subchapter whose next section makes a permit holder certify that construction waste will go to an approved landfill; it names no roof work. The Township pages read for this record name no code edition.
Permit process
Antis Township's pages list roofing under a Township assessment permit that its fee schedule heads "exempt from UCC Compliance." The Township's Permits and Applications page says "Any construction or the erection of prefabricated structures over 100 square feet require a permit, including new siding or roofing," and then lists what "A UCC permit is required for" without naming roofing. The Township's 2026 fee schedule lists "Replacement of Roofing Material" under "Building Assessment Permit Fees (exempt from UCC Compliance)" with no amount shown, and the Township's permit application lists "Residential Roofing (free without structural alterations)" among the projects in its section headed "Minor Construction/Renovation (Assessment Permit only needed)." The Building Inspections and Codes Enforcement page says "Typically, permits are required for the following" and lists "roof replacement on a residential building if the substrate is replaced"; its list of work for which "Permits are not required" does not name roofing. Section 150.01(B) adopts the Uniform Construction Code in 34 Pa. Code Chapter 401 et seq., "as amended from time to time," "as the Municipal Building Code of the township," and Section 150.01(E)(1) keeps in force building code ordinances "adopted by the township on or before July 1, 1999, and which equal or exceed the requirements of the code." Section 150.16 (Ord. 4-1992) says "No building or structure, or any part thereof, shall be erected, enlarged, converted, repaired, altered, razed and/or demolished, until a building permit shall have been procured from the township," in a subchapter whose next section makes a permit holder certify that construction waste will go to an approved landfill; it names no roof work. Under state law, Act 45 section 104(b)(5) and (6) list "Alterations to residential buildings which do not make structural changes or changes to means of egress" and "Repairs to residential buildings" among work the Act does not apply to, "except as might be required by ordinances in effect pursuant to section 303(b)(1) or adopted pursuant to section 503," and 34 Pa. Code 403.62(c) says "A permit is not required for the exceptions listed in § 403.1(b) (relating to scope) and the following, if the work does not violate a law or ordinance." The Township's own pages describe the roofing permit as an assessment permit, and this record does not decide whether a Uniform Construction Code permit is required for an ordinary reroof. In practice, expect the Township to ask for its assessment permit for new roofing, and for a building permit where the roof substrate is replaced. Ask the Township Municipal Building at (814) 742-7361 before work starts. Residential applications go to the Township in person or by e-mail, and the Permitting and Codes Officer works Monday through Friday, 8:00 a.m. to 4:30 p.m. Section 150.17(C) excuses some small projects from proof of landfill disposal of construction waste "(except any roofing material)." Read for this answer: Chapter 150 of the Township Code (Building Regulations), Sections 150.01 and 150.15 to 150.17, and Section 150.99; the Township's Building Inspections and Codes Enforcement, Permits and Applications and Township Code pages; the Township's permit application (MDIA and PMCA version); and the Township's 2026 fee schedule.