City of Rapid City, South Dakota - Community Planning & Development Services, Building Services Division

City of Rapid City, South Dakota

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Required

Required

Permit administration in Rapid City runs off RCMC Chapter 15.04 (Administration), not off IRC/IBC Chapter 1 - both the 2018 IRC and 2018 IBC adoptions delete the model codes' Chapter 1 and substitute RCMC 15.04. The two operative sections are RCMC 15.04.150 (Building permit required) and RCMC 15.04.160 (Building permit - Exceptions); a roofer should read 15.04.160's exemption list directly, because that is where any small-repair carve-out for roofing would live. The City's Building Services Division (605-394-4120) publicly reminds residents to check out roofing contractors and obtain permits for roofing work. Note that South Dakota state law requires a seller of residential property to disclose substandard work or the absence of permits and inspection approvals, which raises the practical cost to a homeowner of an unpermitted re-roof.

CITY-SET, NOT STATE-SET. South Dakota does not impose a mandatory statewide building code: under SDCL chapter 11-10 a municipality MAY enact a construction ordinance (SDCL 11-10-12 for residential structures, titled "Enactment of standards of International Residential Code--Sprinkler system--Not Required"; SDCL 11-10-5 for non-residential), and a city that never adopts one has no building-code-based roofing requirement at all. Rapid City is a city that HAS adopted. Rapid City Municipal Code Title 15 (Buildings and Construction) adopts, at Chapter 15.13, the International Residential Code for One- and Two-Family Dwellings, 2018 edition (Chapters 1-11, Chapter 44, and Appendices E, H and K - the adopting text at RCMC 15.13.010, read live 2026-08-08, names three appendices, not four; an earlier draft of this field carried a spurious Appendix J), applicable to 1- and 2-family dwellings only, and separately adopting IRC Section P2904 (Dwelling Unit Fire Sprinkler Systems) as amended within the Code at RCMC 15.13.300, enacted by Ordinance No. 6270 (2019); and at Chapter 15.12 the International Building Code, 2018 edition (Chapters 1-27, 29-35 and Appendices C, I and J), applicable to all occupancies EXCEPT 1- and 2-family dwellings, enacted by Ordinance No. 6285 (2019). In both adoptions the model code's Chapter 1 (administration) provisions are deleted and replaced by the comparable provisions of RCMC Chapter 15.04 (Administration), which is therefore the operative permit-administration text rather than IRC/IBC Chapter 1. Rapid City separately adopted the 2024 International Fire Code at RCMC Chapter 8.24 - a different code family on a newer edition, and not the roofing-governing code. The published municipal code was current through Ordinance No. 6701, passed December 23, 2025. EDITION NOTE: the residential roofing text that governs in Rapid City is the 2018 IRC as amended by RCMC Chapter 15.13, not the newer IRC edition named in current SDCL 11-10; the state statute only constrains the edition a city must track when it enacts or re-enacts an ordinance, and Rapid City's standing Title 15 adoption is the 2018 edition.

Required — Locally amended, not left to the baseline model-code trigger. RCMC 15.13.270 is titled "IRC Chapter 9, Section R905.1.2 Ice barrier--Amended" and amends that section of the adopted 2018 IRC to read in its entirety as follows, quoted from the section read live on 2026-08-08: "R905.1.2 Ice barrier. In areas where there has been a history of ice forming along the eaves causing a backup of water as designated in Table R301.2(1), an ice barrier that consists of a least two layers of underlayment cemented together or of a self-adhering polymer modified bitumen sheet, shall be used in lieu of normal underlayment and extend from the lowest edges of all roof surfaces to a point at least 24 inches (610 mm) inside the exterior wall line of the building." (The "a least" is the code's own typographical error, reproduced here rather than silently repaired.) The amended section carries ONE exception - "Detached accessory structures that contain no conditioned floor area" - and one further operative sentence that a roofer must plan around: "If the ice shield is not inspected, the contractor shall provide an affidavit that the ice shield materials were installed properly." That affidavit is the discharge route when the RCMC 15.04.280(A)(7) ice barrier inspection does not happen; see midroof_inspection_required. Section history: Ord. 6270, 2019; Ord. 6009, 2015; Ord. 5891, 2013; Ord. 5819, 2012. SCOPE LIMITS, stated because an earlier draft of this field overstated them: the Rapid City amendment contains NO 8-in-12 slope trigger, NO 36-inch measured-along-the-slope requirement, and NO enumerated list of covered roof coverings - the single dimensional requirement it imposes is the 24 inches inside the exterior wall line. Separately, RCMC 15.13.280 assumes ice barrier membrane may be present in existing assemblies, permitting an adhered existing ice barrier to remain in place and be covered with an additional layer of ice barrier membrane in accordance with Section R905. About ice & water barrier

Required — Rapid City has a distinct mid-roof-stage inspection, and it is an ice barrier inspection rather than a decking inspection. RCMC 15.04.280 (Required inspections as stated on building permit) enumerates eleven inspections, and I read the full list; item 7 is "Ice barrier: To be made when the ice barrier is installed and visible." That inspection point necessarily falls partway through a re-roof - after the ice barrier is laid and before the roof covering conceals it. It is separate from the framing inspection at item 4, which by its own terms happens later ("To be made after all framing, fire blocking, bracing and roof coverings are in place"), and separate from the final inspection at item 8. TWO QUALIFICATIONS A ROOFER MUST PLAN AROUND, both read live. First, the enumerating sentence at RCMC 15.04.280(A) is permissive as to the official rather than the permit holder: "The Building Official, upon notification, may make the inspections as set forth in this section." Second, and more practically, RCMC 15.13.270 - the city's amendment of IRC Section R905.1.2 - supplies an explicit documentary alternative: "If the ice shield is not inspected, the contractor shall provide an affidavit that the ice shield materials were installed properly." So the obligation is real but discharge-able two ways: either the ice barrier is inspected while visible, or the contractor certifies it by affidavit. What a Rapid City roofer cannot do is silently cover the ice barrier and document nothing. RCMC 15.04.280(B) adds teeth: a structure built without one or more required inspections "may be classed as an unlawful structure" and pursued under the adopted International Property Maintenance Code. No mid-roof DECKING inspection is separately enumerated; the deck is instead reached by RCMC 15.13.280, which requires tear-off to bare wood so the deck can be viewed.

Not required — No impact-resistance or hail-rating requirement exists in Rapid City, and no state floor can supply one: South Dakota imposes no mandatory statewide building code (SDCL chapter 11-10 makes local adoption optional), so the city is the only possible source of such a mandate and the city is silent. I read BOTH adopting chapters in full. RCMC Chapter 15.13 (2018 IRC, 1- and 2-family dwellings) carries thirty-three numbered sections, 15.13.010 through 15.13.330, and I read every one; its only amendments to IRC Chapter 9 (Roof Assemblies) are 15.13.260 (R903.4.1 secondary/overflow drains), 15.13.270 (R905.1.2 ice barrier) and 15.13.280 (R908.3 roof replacement). RCMC Chapter 15.12 (2018 IBC, all other occupancies) runs 15.12.010 through 15.12.440, and its sole amendment to IBC Chapter 15 (Roof Assemblies) is 15.12.200, "Section [P] 1502.1 Roof drainage-Amended." None of these four roof-assembly amendments addresses impact resistance, a Class 4 impact rating, or UL 2218. I additionally ran an exact-phrase search across the entire publication set on rapidcity.municipal.codes - Municipal Code, Legislation, Ordinances and Prior Codes - after validating that the exact mode returns correct hits on known phrases ("metal shingle" correctly returns 15.13.280; "ice barrier" correctly returns 15.13.270): "UL 2218" returns zero results and "Class 4" returns zero results in both exact and broad modes. The thirty-four exact hits on the bare word "impact" are all water impact fees, traffic impact studies, environs impact and easement-vacation impact - none is a roof covering provision. DISAMBIGUATION: the only rating-like figures Rapid City does set for roofs are the Table 100-B design criteria - a 115 mph ultimate design wind speed and a 42 psf ground snow load - which are WIND and SNOW loading, not impact or hail ratings, and are governed by entirely different standards.

NO THRESHOLD - Rapid City sets no dollar-value and no square-footage floor below which a roof repair escapes the permit requirement. RCMC 15.04.150 (Building permit required) reaches repair work on its face: "Except as otherwise specified in this code, no building or structure or part thereof regulated by this code shall be erected, constructed, enlarged, altered, repaired as defined by code, moved, improved, removed, converted or demolished unless a separate permit for each building or structure has first been obtained from the Building Official." The carve-outs live at RCMC 15.04.160 (Building permit-Exceptions), and I read that exemption list in full - all thirteen lettered Building items (a) through (m), plus the nine Mechanical items and the nine Electrical items. NO roofing or roof-covering exemption appears anywhere in it. The omission is meaningful rather than an accident of drafting, because the list does exempt the sibling envelope trades by name: item (j) exempts "Replacement of siding, windows, masonry, or stone for 1- and 2-family dwellings and accessory structures" (itself subject to a historic-district and National Register carve-back per SDCL 1-19-11.1), and item (l) exempts "Gutters, downspouts, and storm windows." Roof coverings are absent from both. A roofer in Rapid City should therefore assume a permit for re-roof and for repair alike, with no de minimis exemption to fall back on. Note also RCMC 15.04.160(B): "Exemption from the permit requirements of this code shall not be deemed to grant authorization for any work to be done in any manner in violation of the provisions of this title" - an exemption from permitting is never an exemption from the code's substantive requirements.

CITY-SET, and adopted identically for residential and commercial work. Rapid City fills in IRC Table R301.2(1) by local amendment at RCMC 15.13.070 ("IRC Chapter 3, Table R301.2(1) Climatic and geographic design criteria-Amended") and adopts the very same table on the commercial side at RCMC 15.12.440 ("Appendix A, Table 100-B, Climatic and geographic design criteria-adopted"); I read both, and their values are identical. TABLE 100-B, CLIMATIC AND GEOGRAPHIC DESIGN CRITERIA: ground snow level 42 psf; wind speed 115 mph; seismic design category per footnote; weathering Moderate; frost line depth 42 inches; termite None to slight; winter design temperature -7 degrees F; ice barrier underlayment required Yes; flood hazards June 3, 2013 with revisions; air freezing index 1548; mean annual temperature 48 degrees F. THE THREE FOOTNOTES, which carry the operative engineering instructions: (1) "The ground snow load for Rapid City shall be 42 psf and as per ASCE 7-10." (2) "Wind loads shall be in accordance with Chapters 26 to 30 of ASCE 7-10 and shall be based upon the Occupancy Category of the building under design. Buildings shall at a minimum be designed to Occupancy Category II having an ultimate wind speed velocity of 115 mph." (3) Seismic loads shall be in accordance with Section 1613 of the 2018 IBC and ASCE 7-10; in the absence of specific site information the building shall be designed to short period acceleration Ss = 0.125g, 1-second period acceleration S1 = 0.043g, Site Class D. EDITION NOTE worth a roofer's attention: the referenced load standard is ASCE 7-10, not a later edition, and the 115 mph figure is an ULTIMATE (strength-level, Vult) wind speed tied to Risk/Occupancy Category II as a floor, not an allowable-stress-level speed - the two are not interchangeable when sizing fastening schedules. The ice barrier entry reading "Yes" is what triggers the locally amended ice barrier rule at RCMC 15.13.270.

ZERO LAYERS - full tear-off. This is a genuine Rapid City local amendment, not baseline model-code text: RCMC 15.13.280 ("IRC Chapter 9, Section R908.3 Roof replacement--Amended") amends the adopted 2018 IRC so that new roof coverings shall not be installed without first removing all existing layers of roof coverings so that the bare wood can be viewed. Recover/overlay over an existing roof covering is therefore not an option in Rapid City for the covered roof types. The amended section carries these exceptions: (1) complete and separate roofing systems, such as standing-seam metal roof systems, that are designed to transmit the roof loads directly to the building's structural system and that do not rely on existing roofs and roof coverings for support do not require removal of the existing roof coverings; (2) installation of metal panel, metal shingle, and concrete and clay tile roof coverings over existing wood shake roofs is permitted where the application is in accordance with Section R908.4; (3) application of new protective coating over an existing spray polyurethane foam roofing system is permitted without tear-off of the existing roof covering; and (4) where the existing roof assembly includes an ice barrier membrane adhered to the roof deck, that existing ice barrier membrane may remain in place and be covered with an additional layer of ice barrier membrane in accordance with Section R905.

Rapid City does not publish a separate sheathing-material specification beyond the adopted 2018 IRC, but it does impose a locally-amended deck-exposure rule that a roofer must plan for: RCMC 15.13.280, the city's amendment of IRC Section R908.3 (Roof replacement), requires that all existing layers of roof covering be removed so that the BARE WOOD DECK CAN BE VIEWED before the new roof covering is installed. The deck must therefore be fully exposed on every re-roof, rather than covered over, on all roofs that do not fall within the four exceptions listed in roof_layer_limit. The underlying material/attachment provisions are the unamended 2018 IRC Chapter 9 text as adopted at RCMC Chapter 15.13; that model-code text is behind the ICC paywall and is not restated here.

South Dakota's state sales and use tax rate is 4.2%, per the South Dakota Department of Revenue's Sales & Use Tax page. The City of Rapid City also imposes its own municipal sales/use tax of 2.00% (DOR municipal tax code 298-2), on top of the state rate, for a combined general sales and use tax rate of 6.2% on retail purchases such as roofing materials bought in Rapid City. Rapid City separately imposes a 1.00% municipal gross receipts tax (MGRT, DOR code 298-1), but the Department of Revenue's own municipal tax chart shows MGRT applies only to lodging, eating establishments, alcoholic beverages, and admissions to places of amusement - it is not applied to construction or roofing work. Roofing contract revenue itself is separately subject to the statewide 2% contractors' excise tax under SDCL chapter 10-46A, which every contractor must hold a Contractor's Excise Tax License to remit, regardless of which South Dakota city the work occurs in.