Westminster Colorado Roofing Codes

Roofing contractors and hail damage roof inspectors can access the Westminster Colorado Roofing Codes for residential roof repair and roof replacement projects as well as commercial roof repair and replacement projects.

Information Updated On

1/6/2019

Building Department Phone

303-658-2075

Inspection Line

303-650-0626

https://www.cityofwestminster.us/Government/Departments/CommunityDevelopment/Building/Inspections

Permits

https://www.cityofwestminster.us/Government/Departments/CommunityDevelopment/ApplyforaPermitorProject

Fax

303-706-3922

Department Website

https://www.cityofwestminster.us/Government/Departments/CommunityDevelopment/building/contractors

Informational Handout

https://www.cityofwestminster.us/Portals/1/Documents/Government%20-%20Documents/Departments/Community%20Development/Building/SingleFamilyResidential_ReRoofing.pdf

Current Building Code

2015 IRC/IBC

Current Energy Code

2015 IECC

Requires a Building Permit

Yes

Other/Special Permits required

Decking permit

Roof System/Fire Rating required for Residential Dwellings

Class C

Minimum designed wind speed rating for Asphalt Shingles

100-120 MPH, location based

ASTM Standard for wind rating

ASTM D 7158 G or H

Requires a manufacturer’s wind warranty

Per manufacturer

Requires wind nailing

Yes, per manufacturer requirements

Inspectors carry ladders for the final

Yes, with one story access – contractor to provide if over one story

Requires midroof (in progress) inspection

Yes on non-asphalt and commercial builds at 50%

Maximum number of layers of asphalt shingles permitted

One layer

Maximum number of layers of flat roof material permitted

One layer

Require a sheathing/decking inspection

Yes, a decking inspection

Requires solid sheeting (plywood/OSB) over spaced decking

Yes

Maximum gap size for sheeting

¼ inch gap

Requires drip edge

Yes

Drip edge size minimum

Must extend ¼ inch below sheathing and 2 inches on roof

Requires Rake/Gable metal edging

Yes

Enforces the use of Self Adhering Underlayment (i.e., Ice & Water)

No

Underlayment required for 4:12 and above

15#

Type of valleys allowed

Both

Valley Underlayment/Material required for closed valleys

Either

Valley Underlayment/Material required for open valleys

Either

Kick-out required on Step Flashing

Yes

Minimum curb height requirement

No

Requires positive drainage

Yes

Requires ventilation to meet building codes

Yes, new construction only

Permits Soffit eave/vents

Yes

Allows 90 lb rolled roofing on low slope heating living space

Yes

Low Slope

1:12 per manufacture

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