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Longmont Colorado Roofing Codes
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
1-15-20
Building Department Phone
303-651-8332
Inspection Line
303-651-8332
Fax Line
303-651-8332
Please check Codes Locally as some codes may have changed since this page was last updated
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
