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Longmont Colorado Roofing Codes
Here are the Longmont Colorado roofing codes. Note there will be changes in the roofing codes at the end of 2018. A double layer of underlayment is required on roof replacements in Longmont.
Information Updated On
8/22/18
Building Department Phone
303-651-8332
Inspection Line
303-651-8332
Fax Line
303-651-8332
Current Building Code
2015 IBC
Intends to Update Code in the Future
Yes, late 2018
Current Energy Code
2015 IECC
Requires a Building Permit
Yes
Minimum sustained wind speed rating for Asphalt Shingles
110 MPH sustained wind/130 MPH 3 second gusts
ASTM Standard for wind rating
ASTM D3161 Class F, D7158 Class G & H
Requires a manufacturer’s wind warranty
Yes
Inspectors carry ladders for the final
Yes, with one story access
Requires midroof (in progress) inspection
Yes, for commercial before dry-in
Maximum number of layers of asphalt shingles permitted
Only 1 layer is permitted
Maximum number of layers of flat roof material permitted
Only 1 layer permitted
Requires solid sheeting (plywood/OSB) over spaced decking
Yes
Requires drip edge
Yes
Drip edge size minimum
2 x 3
Requires Rake/Gable metal edging
No
Enforces the use of Self Adhering Underlayment (i.e., Ice & Water)
No
Underlayment required 2:12 up to 4:12
A double layer of underlayment required
Underlayment required for 4:12 and above
One layer of minimum Type 15 required
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
Requires ventilation to meet building codes
Yes




