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Douglas County/Highlands Ranch Colorado Roofing Codes
Douglas County/Highlands Ranch Colorado Roofing Codes
These are the current roofing codes for Douglas County and Highlands Ranch Colorado. The minimum sustained wind speed rating for asphalt shingles varies by elevation, specifically if the property is above 7000 feet.
Information Updated On
1/15/20
Building Department Phone
303-660-7497
Inspection Line
303-660-7497 option #1
Please check Codes Locally as some codes may have changed since this page was last updated
Current Building Code
2012 IBC/IRC
Current Energy Code
2012 IECC
Requires a Building Permit
Yes
Other/Special Permits required
Sheathing
Roof System/Fire Rating required for Residential Dwellings
Class C
Roof System/Fire Rating required for Commercial Buildings
Class C
Roof System/Fire Rating required for Multi-Family
Class C
Special conditions
Class of roof system is dependent on type of construction
Minimum sustained wind speed rating for Asphalt Shingles
If over 7000 feet, sustained wind shall be 120 MPH
ASTM Standard for wind rating;
D 7158
Requires a manufacturer’s wind warranty
Per manufacturer 90/120
Requires wind nailing
Yes, if above 7000 ft
Inspectors carry ladders for the final
No, inspectors do not carry ladders
Requires final inspection
Yes
Requires mid-roof inspection
For batten roofing systems only
Maximum number of layers of flat roof material permitted
One unless approved by manufacturer
Require a sheathing/decking inspection
No
Requires solid sheeting (plywood/OSB) over spaced decking
Yes
Maximum gap size for sheeting
Any gap at all – asphalt shingles shall not be installed over spaced decking
Requires drip edge
Yes
Drip edge size minimum
4 x 2
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# asphalt shingle
Type of valleys allowed
Open and closed
Valley Underlayment/Material required for closed valleys
Either – 90# or metal is also ok for asphalt shingle
Valley Underlayment/Material required for open valleys
Either – 90# is also ok
Kick-out required on Step Flashing
Yes
Minimum curb height requirement
Yes
Chimney crickets requirement
Any area 30” or more on a roof surface causing a water dam; ie. Skylights, swamp coolers.
Requires ridge cap
Yes
Requires ventilation to meet building codes
Yes
Requires blower door test when increasing ventilation to code
Yes
Requires Soffit eave/vents
Yes
Low Slope
1:12
