Campbell County Building Division

Campbell County, Wyoming (unincorporated area)

county

Gillette, WY

Not required

2024 IRC (with Appendices A, B, C and E), 2024 IBC, 2024 IPC, 2024 IFGC, 2024 IMC, 2024 IEBC, 2024 IFC and 2024 IPMC, all published by the International Code Council, adopted by reference for unincorporated Campbell County under Chapter 4, Rules Regulating Construction, Section 1.5 (Model Codes and Standards Adopted); the document's own cover page is dated "Amended June 2026." The IRC is adopted at Section 4.A and amended by twelve numbered items (Section 4.A.1-12), none of which touches Chapter 9 (Roof Assemblies). NFPA 70 (2026 National Electrical Code) and NFPA 58 (2017 Liquefied Petroleum Gas Code) are adopted alongside under Section 1.5.B. This is the unincorporated county's own code; the City of Gillette administers a separate building department inside city limits.

Required — Chapter 4's twelve-item IRC amendment list (Section 4.A.1-12), read in full, does not touch IRC Chapter 9 at all, so the base 2024 IRC drip edge provision at Section R905.2.8.5 (drip edge at eaves and rakes of asphalt shingle roofs) stands as written for the unincorporated county. About drip edge

Required — Chapter 4, Section 1.6.I, Climatic and Geographical Design Criteria (the table that Section 4.A.2 substitutes for IRC Table R301.2), states plainly: "Ice Barrier Roof Underlayment Requirements: Yes/ Required." That designation triggers the base IRC ice-barrier extent rule at Section R905.1.2. The same table lists Weathering as "Severe." About ice & water barrier

Not required — Chapter 4, Rules Regulating Construction, was read in full (93 pages, Sections 1 through 13 plus appendices): it names no dedicated roof-sheathing, dry-in or pre-covering inspection stage. The county's own new-home brochure lists the inspection stages it does track for a Certificate of Occupancy as "Footing," "Stemwall," "Service Utility Lines," "'Rough-in' framing, electric, plumbing & HVAC," "Drywall" and "Final Inspection" -- no roof-specific stage among them. A roof job is covered by the general Building Permit inspection and final-inspection process rather than by a named mid-roof checkpoint.

Not required — Chapter 4's twelve-item IRC amendment list (Section 4.A.1-12), read in full, contains no amendment to IRC Chapter 9 and no occurrence of "impact," "UL 2218" or "Class 4"/"Class IV." No impact-resistant shingle mandate appears anywhere in the county's own construction rules, so none applies beyond whatever the unamended base 2024 IRC itself requires (which is none, absent a local amendment).

No dollar-value or square-footage threshold is stated. Chapter 4, Rules Regulating Construction (amended June 2026), Section 1.3.A requires any Owner who intends to "construct, enlarge, alter, repair, move, demolish" a building to first obtain a Building Permit, except as exempted under Section 1.4. Section 1.4.A.3 then exempts "One or Two-Family Residential dwellings ... located outside of a Platted Subdivision" from Building Permits entirely, "provided that ... permits are required for the structures' interior and exterior electrical, plumbing, mechanical, and Small Wastewater System needs." No other exemption in Section 1.4 (items 1, 2 and 4 through 8) reaches an occupied one- or two-family dwelling. So a roof repair or replacement on a house inside a platted subdivision needs a Building Permit under the general rule, while the identical work on a house outside a platted subdivision (unplatted rural land, common in this county) is exempt from the Building Permit, though its electrical, plumbing, mechanical and wastewater trades still need their own permits if the job touches them. The county's own visitor brochure on building a home on rural property outside a subdivision states plainly that such homes DO need permits and lists a "Completed Building Permit & Zoning Certificate Application" among the requirements, which reads as the opposite of the Section 1.4.A.3 exemption; this record does not resolve that conflict and reports both. Confirm which category a given parcel falls into with the Building Division before assuming either way.

Chapter 4, Section 1.6.B, Basic Design Wind Speeds (the table Section 4.A.2 substitutes for IRC Table R301.2), sets: Risk Category I 100 mph, Risk Category II 110 mph, Risk Category III 115 mph, Risk Category IV 120 mph. A standard one- or two-family dwelling is Risk Category II under the IRC/ASCE 7 risk-category scheme, so 110 mph is the figure that normally applies to a house; the higher categories apply to essential and hazardous facilities the IRC does not cover. The same table sets Seismic Design Category "B" and Minimum Roof Snow Loads of 35 psf for roofs of 1:12 pitch and flatter and 30 psf for roofs greater than 1:12 pitch, both "with no reductions," plus Frost Line Depth (Building) of 42 inches and a Winter Design Temperature of minus 5 degrees Fahrenheit.

TWO LAYERS MAXIMUM, SET BY THE UNAMENDED BASE 2024 IRC. Chapter 4, Rules Regulating Construction (amended June 2026), Section 4.A adopts "the 2024 International Residential Code including Appendices 'A', 'B', 'C' and 'E'" by reference, then amends it in twelve numbered items (Section 4.A.1-12) covering board of appeals, the climatic-criteria table, fire protection of floors, fire sprinklers, geotechnical evaluation, energy efficiency, a mechanical locking-port section, freezing/sewer-depth cross-references, an electrical-code precedence clause, and manufactured homes. None of the twelve touches IRC Chapter 9 (Roof Assemblies) or Section R908, and the amendment list was read in full for this entry. So the operative limit on re-covering an existing roof is the unamended base 2024 International Residential Code Section R908.4, Roof recover, Exceptions: a roof recover "shall not be permitted" where "the existing roof has two or more applications of any type of roof covering." One existing layer may be recovered; a second existing layer means a tear-off to the deck.

NOT SET BY THE COUNTY, AND NOT RESTATED HERE. Chapter 4's twelve-item IRC amendment list (Section 4.A.1-12), read in full, contains no amendment to IRC Chapter 8 (Roof-Ceiling Construction) and no reference to sheathing, underlayment or fastening of a roof deck. The governing provision is therefore the base 2024 IRC Chapter 8 sheathing requirement, as adopted for the unincorporated county and unmodified by Chapter 4. That ICC text sits behind the ICC paywall; this record does not reproduce it from any third-party republication, so a roofer needing the exact wording should read it in the code itself or ask the Building Division.

5% total sales/use tax in Campbell County (4% state + 1% general purpose county option, with no municipal add-on -- Wyoming has no municipal sales tax), per the Wyoming Department of Revenue Excise Tax Division's "Sale/Use and Lodging Tax Rates by Locality" chart effective 10/01/2026, unchanged from the 07/01/2026 chart (Campbell County is not among the shaded rate-change rows).