Lyons Roofing Codes: Permits, Inspections, and Requirements
Adopted building and energy codes, permit rules, and roofing requirements for Lyons, Boulder County. Rows below reflect our reading of the jurisdiction's own published sources, linked at the bottom of the page.
Lyons roofing code requirements
- What this jurisdiction requires
- 2024 IBC and 2024 IRC under Ordinance No. 1211
- What this jurisdiction requires
- 2021 IECC, verify the current edition under Ordinance 1211
- What this jurisdiction requires
- Yes
- What this jurisdiction requires
- Class A
- What this jurisdiction requires
- Class A
- What this jurisdiction requires
- Class A
- What this jurisdiction requires
- Yes
- What this jurisdiction requires
- No
- What this jurisdiction requires
- One
- What this jurisdiction requires
- One
- What this jurisdiction requires
- Yes
- What this jurisdiction requires
- Yes
- What this jurisdiction requires
- Yes
- What this jurisdiction requires
- NO
- What this jurisdiction requires
- 19" Overlap of 15#
- What this jurisdiction requires
- Yes
| Requirement | What this jurisdiction requires |
|---|---|
| Current building code | 2024 IBC and 2024 IRC under Ordinance No. 1211 |
| Current energy code | 2021 IECC, verify the current edition under Ordinance 1211 |
| Building permit required | Yes |
| Roof system fire rating (residential) | Class A |
| Roof system fire rating (commercial) | Class A |
| Roof system fire rating (multi-family) | Class A |
| Requires wind nailing | Yes |
| Inspectors carry ladders for the final | No |
| Maximum layers of asphalt shingles permitted | One |
| Maximum layers of flat roof material permitted | One |
| Requires solid sheeting over spaced decking | Yes |
| Requires drip edge | Yes |
| Requires rake / gable metal edging | Yes |
| Self adhering underlayment (ice and water shield) | NO |
| Underlayment required 2:12 up to 4:12 | 19" Overlap of 15# |
| Requires ventilation to meet code | Yes |
Last checked September 2, 2026. This reflects published sources at that date, not an official ruling. Code adoptions change, so confirm with the Lyons building department before you pull a permit.
What Lyons requires, in plain language
Lyons builds to the 2024 IBC and 2024 IRC under Ordinance No. 1211. That edition, not the newest code published nationally, is the rulebook an inspector in Boulder County holds your roof to. Energy work on the same permit follows the 2021 IECC, verify the current edition under Ordinance 1211.
Layer limit in Lyons: One. This is the line item that moves a bid the most. If your existing roof is already at the limit, the deck gets stripped before new material goes down, and the labor plus dump fees belong in the written price. Flat roof sections are capped at One.
Wind is what Lyons tests shingles against. Wind nailing: Yes.
Underlayment and edge metal are where roofs fail inspection. Ice and water shield: NO. On 2:12 to 4:12 slopes: 19" Overlap of 15#. Drip edge: Yes.
Lyons previously ran on the 2021 ICC suite. Ordinance No. 1211 adopts the 2024 IBC and IRC by reference with amendments to Municipal Code Chapter 18.
Installation details above come from our building department field survey for Lyons, last updated 1/2/19. Code editions and contacts are refreshed from the department directly. Always confirm the details on your permit before work starts, since departments amend requirements on their own schedule.
Sources
- https://www.townoflyons.com/834/Building-Department
- https://library.municode.com/co/lyons/codes/municipal_code
These links go straight to the jurisdiction, so you always have the real-time source. Adoptions and amendments change on their schedule, not ours. Always confirm before permitting.
Keep going
Nearby jurisdictions
Last checked September 2, 2026. This is our best read of published sources, not an official ruling. Confirm with the Lyons building department before you pull a permit.