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Commerce City Colorado Roofing Codes
Here is a listing of the Commerce City Colorado roofing codes. Note the current energy code is based on 2009 requirements.
Information Updated On
9/16/2018
Building Department Phone
303-289-3683
Inspection Line
303-289-3652
Permits
Fax
Current Building Code
2009 IBC/IRC
Current Energy Code
2009 IECC
Requires a Building Permit
Yes
Other/Special Permits required
A roofing/re-roofing permit is only for roof new covering installations and/or replacement of existing roof coverings. Sheathing/decking replacement is allowed with roofing or re-roofing permit provided it is included in the description of work. Any other work (e.g. structural modifications) requires a separate permit.
Roof System/Fire Rating required for Residential Dwellings
Class C
Special conditions
Class C allowed on one and two-family dwellings. Other roof covering classifications vary based on the type of construction as defined in the 2009 IBC
Minimum sustained wind speed rating for Asphalt Shingles
90 MPH or 3 second gust
Other wind speed rating
Exposure category C unless engineering analysis justifies different exposure category
Requires a manufacturer’s wind warranty
No
Requires wind nailing
No
Inspectors carry ladders for the final
Yes, but only with one story access.
Requires midroof (in progress) inspection
Yes, required at 50% complete.
Maximum number of layers of asphalt shingles permitted
Two layers
Maximum number of layers of flat roof material permitted
Two layers
Require a sheathing/decking inspection
Yes
Requires solid sheeting (plywood/OSB) over spaced decking
Yes
Minimum gap size for sheeting
3/8” gap
Requires drip edge
Yes
Drip edge size minimum
1 x 2
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” overlap of 30 pound
Underlayment required for 4:12 and above
15 pound
Type of valleys allowed
Open and closed
Valley Underlayment/Material required for closed valleys
90 pound
Valley Underlayment/Material required for open valleys
90 pound under metal
Kick-out required on Step Flashing
Yes
Minimum curb height requirement
None
Chimney crickets requirement
Yes
Requires ventilation to meet building codes
Yes, attic ventilation must be brought up to current code on tear offs to deck.
Requires Soffit eave/vents
No
