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Class C Roof Assembly

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Old 01-16-2019, 06:36 PM   #1
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Join Date: Jan 2019
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Default Class C roof assembly

In my area, Nevada County, CA the building department requires a Class C roof assembly. Class A/B/C roof assemblies are testing using UL 790 ASTM E 108 standards. Below is an email I sent to Calfire and their response:


I have provided the link to the Flame-Retardant Program for our review. It is primarily for tents and decorative materials such as drapes, curtains, awning, etc. There is a difference between test requirements for wildland interface and the test conducted required by Title-19 Chapter 8. These materials would not be considered roofing materials.

Thank you for contacting the us with your questions.


Thomas Campbell
Deputy State Fire Marshal III
Office of the State Fire Marshal

From: Nicholas McBurney [mailto:[email protected]]
Sent: Friday, December 14, 2018 3:08 PM
To: CALFIRE SFM Flame Retardant Program <
[email protected]>
Subject: Question on Yurt fabric rating

Good afternoon,

I have a registered flame resistant product listing F-12241 being proposed as the exterior covering of a Pacific Yurt including the roof. We have determined that a u-occupancy building that does not need to comply with the Wildland Urban Interface requirements (<50’ from the residence) must have a minimum class C roof assembly. My understanding is that fabric is tested using different testing standards then roofing material. As such, we have not allowed the use of this fabric as an equivalent. Does CalFire certify this fabric as meeting a class A, B or C roof assembly requirement?

Here is my question: Has anyone put a Class A/B/C rated roof assembly on a lightweight lattice style yurt? If so, can you send me the listed assembly?

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Old 01-21-2019, 08:46 AM   #2
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Posts: 2,402
Default Re: Class C roof assembly

I am going to tag

Pacific Yurts

on this. They may have more info.
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Old 01-22-2019, 09:50 AM   #3
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Location: Indianapolis, IN
Posts: 32
Default Re: Class C roof assembly

OK, to make this ever clear the "CLASS C RATING" is talking about the total assembly of the roof "system"

so that is:


and outer cover

Yurts of America

ONLY uses


roofs, we haven't done vinyl roofs in almost 10 years.

Due to this I know that


roofs does meet the "Class C" request for roofing.

After that, it depends on what is under the Duro-Last. Duro-Last website has the spec sheets for the product.

If you are a DYIer, if whatever you are using is listed as "fire retardant". Just ask you vendor for a copy of the fabric specs. On the spec sheet, it will clearly say what ratings the fabric has gone through.

The it's just a matter of adding the spec sheet to the other information you turn into the state code enforcement.

The other thing you can do is ask for a variance. This is a simple matter to do, most states you can file online.
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