Class A Roof Coverings

[Glennman CBO]

Pardon me for being too simplified here, can anyone give me an example in the 2009 IBC where a Class A roof covering is required?

Type of construction, fire separation distance, etc?

Thanks in advance.

 

[mark handler]

In California, R902.1.1 Roof coverings within Very-High Fire Hazard Severity Zones.

CBC 1505.1.1 Roof coverings within very high fire hazard severity zones

 

[Builder Bob]

I believe if your jurisdiction has a "fire District" as outlined by the code - generally an area where development is dense and has a large population with the potential for large property and/or life loss. (Downtown for example)

Appendix D

D102.2.4 Roof covering. Roof covering in the fire district

shall conform to the requirements of Class A or B roof coverings

as defined in Section 1505.

 

[RLGA]

A class A roof is not required any where in the 2009 IBC (or any edition that I can recall).

 

[mark handler]

Glenn

Have you adopted the Wildland Urban Interface Code?

 

[Builder Bob]

WUIC

504.2 Roof covering.

Roofs shall have a Class A roof assembly. For roof coverings where the profile allows a space between the roof covering and roof decking, the space at the eave ends shall be firestopped to preclude entry of flames or embers, or have one layer of 72-pound (32.4 kg) mineral-surfaced, nonperforated cap sheet complying with ASTM D 3909 installed over the combustible decking.

 

[Glennman CBO]

Very interesting on the Wildland Urban Interface Code.

I just found it interesting that there is a Class A rated roof covering in the IBC, but nowhere is it called out as required. I'll look at the appendix, but it is not adopted. I don't know about the WUIC though. Thanks everyone for the replies!

 

[mtlogcabin]

TABLE 1505.1 a, b

MINIMUM ROOF COVERING CLASSIFICATION FOR TYPES OF CONSTRUCTION

a. Unless otherwise required in accordance with the International Wildland-Urban Interface Code or due to the location of the building within a fire district in accordance with Appendix D

Just like any referenced standard the Wildland Urban Interface does not require adoption for the CLass A roof covering requirement as noted in foot note "a" of Table 1505.1

 

[mark handler]

TABLE 1505.1 a, bMINIMUM ROOF COVERING CLASSIFICATION FOR TYPES OF CONSTRUCTION

a. Unless otherwise required in accordance with the International Wildland-Urban Interface Code or due to the location of the building within a fire district in accordance with Appendix D

Just like any referenced standard the Wildland Urban Interface does not require adoption for the CLass A roof covering requirement as noted in foot note "a" of Table 1505.1

Depends on where you are, California does not require adoption, it is a part of the code.

 

[Architect1281]

Fire Classification in 1505 at Table 1505.1 Lists MINIMUM ROOF COVERING CLASSIFICATION FOR TYPES OF CONSTRUCTION

By that chart I can only require a Class B or a Class C as a Building Official --- UNTIL the DRP Specifies a Class A - then I enforce the approved plans.

 

[Glennman CBO]

Architect... I agreee!