Jefferson County Roofing Codes: Permits, Inspections, and Requirements
Adopted building and energy codes, permit rules, and roofing requirements for Jefferson County, Jefferson County. Rows below reflect our reading of the jurisdiction's own published sources, linked at the bottom of the page.
Building department
303-271-8260Inspection line
303-271-8261Permit line
303-271-8260Official department
Live code pageJefferson County roofing code requirements
- What this jurisdiction requires
- 2024 IBC and 2024 IRC with Jefferson County supplements
- What this jurisdiction requires
- Yes
- What this jurisdiction requires
- Class A
- What this jurisdiction requires
- D 7158 (G or H) or D 3161 (A, D, & F)
- What this jurisdiction requires
- No
- What this jurisdiction requires
- Yes, per manufacturer's specifications
- What this jurisdiction requires
- Yes, with one story access
- What this jurisdiction requires
- Yes, when more than 10% but less than 25% of the roof is complete.
- What this jurisdiction requires
- Yes
- What this jurisdiction requires
- One layer
- What this jurisdiction requires
- One layer, complete tear off required
- What this jurisdiction requires
- Yes
- What this jurisdiction requires
- 3/8" gap
- What this jurisdiction requires
- Required
- What this jurisdiction requires
- 2 x 2
- What this jurisdiction requires
- Required
- What this jurisdiction requires
- Ice barrier required at eaves per the IRC
- What this jurisdiction requires
- Two layers of underlayment
- What this jurisdiction requires
- One layer of underlayment
- What this jurisdiction requires
- Open and closed
- What this jurisdiction requires
- Ice and water barrier
- What this jurisdiction requires
- Either
- What this jurisdiction requires
- Required where the roof meets a wall
- What this jurisdiction requires
- Yes
- What this jurisdiction requires
- 4"
- What this jurisdiction requires
- Required, installed to manufacturer specifications
- What this jurisdiction requires
- Required per IRC attic ventilation provisions
- What this jurisdiction requires
- At elevations above 6400' Class A roof coverings are required.
| Requirement | What this jurisdiction requires |
|---|---|
| Current building code | 2024 IBC and 2024 IRC with Jefferson County supplements |
| Building permit required | Yes |
| Roof system fire rating (residential) | Class A |
| ASTM standard for wind rating | D 7158 (G or H) or D 3161 (A, D, & F) |
| Requires a manufacturer wind warranty | No |
| Requires wind nailing | Yes, per manufacturer's specifications |
| Inspectors carry ladders for the final | Yes, with one story access |
| Requires midroof (in progress) inspection | Yes, when more than 10% but less than 25% of the roof is complete. |
| Requires a sheathing / decking inspection | Yes |
| Maximum layers of asphalt shingles permitted | One layer |
| Maximum layers of flat roof material permitted | One layer, complete tear off required |
| Requires solid sheeting over spaced decking | Yes |
| Sheeting gap requirement | 3/8" gap |
| Requires drip edge | Required |
| Minimum drip edge size | 2 x 2 |
| Requires rake / gable metal edging | Required |
| Self adhering underlayment (ice and water shield) | Ice barrier required at eaves per the IRC |
| Underlayment required 2:12 up to 4:12 | Two layers of underlayment |
| Underlayment required 4:12 and above | One layer of underlayment |
| Type of valleys allowed | Open and closed |
| Valley material required for closed valleys | Ice and water barrier |
| Valley material required for open valleys | Either |
| Kick-out required on step flashing | Required where the roof meets a wall |
| Chimney cricket requirement | Yes |
| Minimum curb height requirement | 4" |
| Requires ridge cap | Required, installed to manufacturer specifications |
| Requires soffit / eave vents | Required per IRC attic ventilation provisions |
| Special conditions | At elevations above 6400' Class A roof coverings are required. |
Last checked September 2, 2026. This reflects published sources at that date, not an official ruling. Code adoptions change, so confirm with the Jefferson County building department before you pull a permit.
What Jefferson County requires, in plain language
Jefferson County builds to the 2024 IBC and 2024 IRC with Jefferson County supplements. That edition, not the newest code published nationally, is the rulebook an inspector in Jefferson County holds your roof to.
Layer limit in Jefferson County: One layer. 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 layer, complete tear off required.
Wind is what Jefferson County tests shingles against. Rating is proven under D 7158 (G or H) or D 3161 (A, D, & F). Wind nailing: Yes, per manufacturer's specifications. Manufacturer wind warranty: No.
Underlayment and edge metal are where roofs fail inspection. Ice and water shield: Ice barrier required at eaves per the IRC. On 2:12 to 4:12 slopes: Two layers of underlayment. On 4:12 and steeper: One layer of underlayment. Drip edge: Required. Minimum drip edge size 2 x 2.
Jefferson County Building Safety serves unincorporated Jefferson County. The county publishes its adopted codes plus county specific supplements that carry local roofing amendments.
Installation details above come from our building department field survey for Jefferson County, last updated 9/9/18. 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
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.
Last checked September 2, 2026. This is our best read of published sources, not an official ruling. Confirm with the Jefferson County building department before you pull a permit.