How Can We Help You On Your Roofing Needs?

Longmont Colorado Roofing Codes

Our Certifications & Accreditations

Get in touch

Request a Free Inspection

Fill-in the form & request your free home inspection
  • This field is for validation purposes and should be left unchanged.

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

Department Website

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

Need Roof Service & Maintenance Or Have
Any Questions? We are Ready to Help!

Icon