Homeowners and roofing contractors can review the Windsor Colorado Roofing Codes for residential roof repair and roof replacement projects. Roofing contractors in Windsor also use the roofing codes for commercial roofing.

Information Updated On

1/7/2019

Building Department Phone

970-674-2400

Inspection Line

970-674-1036

Permits

Fax

970-674-2456

Department Website

Informational Handout

Current Building Code

2012 IRC/IBC

Current Energy Code

2009 IECC

Requires a Building Permit

Yes

Roof System/Fire Rating required for Residential Dwellings

Class A

Special conditions

A,B or C depending on building construction classification

Minimum sustained wind speed rating for Asphalt Shingles

90 MPH 3 second gusts

ASTM Standard for wind rating

ASTM D 7158, ASTM 3161 Class A, D, F

Requires a manufacturer’s wind warranty

Per manufacturer

Requires wind nailing

Yes

Inspectors carry ladders for the final

Yes, with one story access

Requires midroof (in progress) inspection

Yes

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 – exception: if decking has rotted and been replaced

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

1 x 2 – cover sheathing by ¼ inch

Requires Rake/Gable metal edging

Yes

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

No

Underlayment required 2:12 up to 4:12

19 inch overlap of 15#

Underlayment required for 4:12 and above

15# – for asphalt: two layers on 2:12 – 4:12 non asphalt: varies per code

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

Chimney crickets requirement

30” or greater width

Requires positive drainage

Yes

Requires ventilation to meet building codes

Yes

Requires Soffit eave/vents

Yes

Allows 90 lb rolled roofing on low slope heating living space

Yes

Low Slope

2:12 – 1:12 allowed but with restrictions